PRACTICAL II Flashcards

1
Q

Frontalis

A
O = Cranial aponeurosis 
I = Skin of eyebrows and root of nose 
A = Raises eyebrows
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2
Q

Occipitalis

A
O = Occipital and temporal bones 
I = Cranial aponeurosis 
A = Pulls scalp posteriorly
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3
Q

Orbicularis Oculi

A
O = Frontal and maxillary bones
I = Inside of eyelid 
A = Draws eyelids inferiorly
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4
Q

Orbicularis Oris

A
O = Madible and maxillary bones 
I = Skin/muscle around mouth 
A = Closes mouth and protrudes lips.
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5
Q

Zygomaticus (major and minor)

A
O = Zygomatic bone 
I = Skin/ muscle at corner of map 
A = Elevates lateral corner of the mouth to smile
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6
Q

Mentalis

A
O = Mandible 
I = Skin of chin
A = Protrudes lower lip and wrinkles the chin
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7
Q

Masseter

A
O = Zygomatic Arch and maxillary bone 
I = Angle and ramus of mandible 
A = Elevates mandible
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8
Q

Temporalis

A
O = temporal fossa of temporal bone 
I = coronoid process of mandible 
A = Elevates and retracts jaw
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9
Q

Buccinator

A
O = Posterior maxillary bone and mandible 
I = Orbicularis Oris 
A = Compresses cheeks as in whistling, blowing or sucking.
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10
Q

Sternocleidomastoid

A

O = Manubrium of sternum and the clavicle
I = Mastoid process of temporal bone
A = Bilateral contraction: flexion of the neck forward
Unilateral contraction: lateral flexion, tilting head slightly upward and face to opposite side.

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11
Q

External Intercostals

A
O = Inferior border of each rib
I = Superior border of the rib below 
A = Pulls ribs to one another to elevate thoracic cavity, inspiration.
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12
Q

Internal Intercostals

A
O = Superior border of each rib
I = Inferior border of rib above 
A = Draws ribs together to depress thorax, expiration
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13
Q

Diaphragm

A
O = Xiphoid process of sternum and costal cartilage of last 6 ribs  and lumbar vertebra. 
I = Central tendon of diaphragm 
A = Flattens to increase the volume of the thoracic cavity, inspiration
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14
Q

Rectus abdominis

A
O = pubic crest and symphysis 
I = xiphoid process and costal cartilages of ribs 5-7 
A =  flexes and rotates vertebral column
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15
Q

External Oblique

A
O = ribs 4-12 
I = Iliac crest, linea alba, pubic crest and tubercles 
A = Flexes and rotates vertebral column
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16
Q

Internal Oblique

A
O = Iliac crest, lumber fascia 
I = Linea alba, pubic crest, inferior borders of ribs 9-12 
A = Flexes and rotates vertebral column
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17
Q

Transversus Abdominus

A
O = Iliac crest, lumber facia, inguinal ligament 
I = Linea alba and pubic crest
A = Flexes and rotates vertebral column
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18
Q

Erector Spinae (iliocostalis, longissimus, and spinalis)

A
O = Iliac crest, transverse process of cervical, thoracic, and lumbar vertebrae, and or ribs 3-6.
I = Ribs and transverse processes of vertebrae about 6 segments above origin. 
A = Extends and laterally rotates the vertebral column
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19
Q

Pectoralis Major

A
O = Clavicle, sternum and cartilage of ribs 2-6 
I = Fibers converge to form a short tendon that inserts into the intertubercular groove of the humerus 
A = Flexes, adducts and medially rotates the arm at the shoulder.
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20
Q

Deltoid

A
O = Acromion and spine of scapula, lateral third of clavicle. 
I = Deltoid tuberosity of humerus 
A = Abduction of the arm at the soulder
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21
Q

Serratus Anterior

A
O = 1st to 8th rib 
I = Vertebral border of scapula 
A = Protracts the shoulder, upward rotation of the scapula
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22
Q

Pectoralis minor

A
O = 3rd, 4th, 5th rib near costal cartilages 
I = Coracoid process of scapula 
A = Adducts and protracts the shoulder
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23
Q

Subscapularis

A
O = subscapular fossa 
I = Lesser tubercles of humerus 
A = Medially rotates the arm
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24
Q

Leavator Scapulae

A
O = Transverse process of 4 cervical vertebrae 
I = Vertebral border of scapula 
A = Elevates the scapula
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25
Q

Trapezius

A
O = Occipital bone, ligamentum nuchae, spines of C7 and thoracic vertebrae.
I = Acromion and spinous process of scapula, lateral third of clavicle. 
A = Extends the neck, rotates and adducts scapula, elevates or depresses the scapula
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26
Q

Latissimus dorsi

A
O = Spinous process of lower 6 thoracic vertebrae, all lumbar vertebrae, ribs 8-12 and lumbodorsal fascia 
I = Intertubercular grove of humerus
A = Extends, adducts and medial rotates the shoulder
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27
Q

Supraspinatus

A
O = Supraspinous fossa of the scapula 
I = Greater tubercle of humerus 
A = Abducts the arm
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28
Q

Infraspinatus

A
O = Infraspinous fossa of the scapula 
I = Greater tubercle of humerus 
A = Lateral rotation of arm
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29
Q

Teres minor

A
O = Lateral margin of scapula 
I = Greater tubercle of humerus 
A = Lateral rotation of arm
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30
Q

Teres major

A
O = Inferior angle of scapula 
I = Intertubercular groove of humerus 
A = Extension, adduction and medial rotation of the arm
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31
Q

Rhomboids, major and minor

A
O = Spinous process of C7 and T1 through T5 
I = Medial border of scapula 
A = Adducts scapula and rotates it downward
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32
Q

Triceps brachii

A
O = Long head at inferior margin of glenoid cavity, lateral head at posterior side of humerus, and medial head at distal radial groove of humerus.
I = Olecranon process of the ulna 
A = Extends the forearm at the elbow
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33
Q

Anconeus

A
O = lateral epicondyle of humerus 
I = Lateral side of olecranon process of ulna 
A = Abducts the ulna during forearm pronation, and extends elbow.
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34
Q

Biceps brachii

A
O = Short head at coracoid process of scapula, long head at tubercle superior to glenoid cavity of scapula. 
I = Radial tuberosity 
A = Flexes the forearm at the elbow and supinates the forearm.
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35
Q

Brachioradialis

A
O = distal end of humerus 
I = Coronoid process of ulna 
A = Flexes the forearm
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36
Q

Brachialis

A
O = Distal portion of humerus 
I = Coronoid process of ulna 
A = Flexes the forearm
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37
Q

Pronator Teres

A
O = Medial epicondyle of humerus and coronoid process of ulna 
I = Shaft of the radius 
A = Pronates the forearm
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38
Q

Supinator

A
O = Lateral epicondyle of humerus and proximal ulna 
I = Proximal end of radius 
A = Supinates the forearm at the elbow
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39
Q

Flexor carpi radialis

A
O = Medial epicondyle of humerus 
I = Base of 2nd and 3rd metacarpals 
A = Flexes hand at wrist, and abducts hand at wrist.
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40
Q

Palmaris longus

A
O = Medial epicondyle of humerus 
I = Fascia and skin of palm 
A = Flexes hand at wrist, tenses skin and fascia of palm
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41
Q

Flexor carpi ulnaris

A
O = Medial epicondyle of humerus, posterior surface of ulna 
I = 5th metacarpal base, pisiform and hamate 
A = Flexes and adducts hand at wrist
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42
Q

Flexor digitorum superficialis

A
O = Medial epicondyle of humerus, coronoid process of  ulna, shaft of radius 
I = Middle phalanges of 2nd through 5th digits 
A = Flexes hand and middle phalanges of 2nd-5th digits.
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43
Q

Flexor pollicis longus

A
O = Anterior surface of radius 
I = Distal phalanx of thumb 
A = Flexes thumb
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44
Q

Flexor digitorum profundus

A
O = surface of ulna, and coronoid process
I =  Distal phalanges of 2nd-5th digits 
A = Flexes distal phalanges
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45
Q

Extensor carpi radialis longus

A
O = Supracondylar ridge of the humerus 
I = base of 2nd metacarpal 
A = Extends and abducts the hand at wrist
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46
Q

Extensor carpi radialis brevis

A
O = Lateral epicondyle of the humerus 
I = Base of 3rd metacarpal 
A = Extends and abducts hand at wrist
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47
Q

Extensor digitorum

A
O = Lateral epicondyle of the humerus 
I = Four tendons onto distal phalanges of 2nd-5th digits 
A = Extends the digits at the hand
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48
Q

Extensor carpi ulnaris

A
O = Lateral epicondyle of the humerus 
I = Base of 5th metacarpal 
A = Extends and adducts hand at wrist
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49
Q

Abductor pollicis longus

A
O = Posterior shaft of radius and ulna 
I = Trapezium and 1st metacarpal 
A = Abducts and extends thumb
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50
Q

Iliopsoas

A
O = Iliacus at the iliac fossa, iliac crest, and lateral sacrum; psoas major at bodies and transverse processes of t12 and lumbar vertebrae 
I = On and just below the lesser trochanter of the femur 
A = Flexes the thigh, flexes the trunk and laterally flexes the vertebral column
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51
Q

Sartorius

A
O = Anterior superior iliac spine 
I = Medial side of proximal tibia by an aponeurosis 
A = Flexes, abducts, and laterally rotates the thigh, flexes the leg at the knee
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52
Q

Rectus Femoris

A
O = Anterior inferior iliac spine, superior margin of the acetabulum 
I = Tibial tuberosity and patella 
A = Extends the leg at the knee and flexes thigh at hip
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53
Q

Tensor fascia latae

A
O = Anterior side of iliac crest and anterior superior iliac spine 
I = Iliotibial tract 
A = Flexes, abducts, medialy rotates the thigh
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54
Q

Gracilis

A
O = Inferior ramus and body of pubis 
I = Medial surface of tibia inferior to medial condyle
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55
Q

Vastus lateralis

A
O = Greater trochanter, intertrochanteric line and linea aspera
I = Tibial tuberosity and patella 
A = Extends the leg at the knee
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56
Q

Vastus medialis

A
O = Linea aspera and intertrochanteric line 
I = Tibial tuberosity and patella 
A = Extends the leg at the knee
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57
Q

Vastus intermedius

A
O = Anterior and lateral surface of femur 
I = Tibial tuberosity and patella 
A = Extends the leg at the knee
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58
Q

Adductor longus

A
O = Pubis near pubic symphysis 
I = Linea aspera 
A = Adducts, medially rotates, and flexes the thigh at the hip
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59
Q

Adductor magnus

A
O = Ischial and pubic rami, ischial tuberosity 
I = Linea aspera and adductor tubercle of the femur 
A = Adducts, medially rotates, and flexes the thigh at the hip
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60
Q

Gluteus maximus

A
O = Posterior side of the ilium, sacrum and coccyx 
I = Gluteal tuberosity of femur, iliotibial tract 
A = Extends the thigh when it is elevated (as in climbing stairs), Laterally rotates and abducts the thigh
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61
Q

Gluteus medius

A
O = Upper lateral surface of the ilium 
I = Greater trochanter of femur 
A = Abducts and medially rotates the thigh
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62
Q

Biceps femoris

A
O = Long head at ischial tuberosity; short head at linea aspera and distal end of femur 
I = head of fibula and lateral condyle of tibia 
A = Extends the thigh at the hip
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63
Q

Semitendinosus

A
O = ischial tuberosity 
I = Medial side of the proximal tibia 
A = Extends the thigh at the hip, laterally rotates the thigh at the hip, flexes the leg at the knee
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64
Q

Semimbranosus

A
O = Ischial tuberosity 
I = Medial side of the proximal tibia 
A = Extends the thigh at the hip, flexes the leg at the knee, medially rotates the thigh
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65
Q

Tibialis anterior

A
O = Lateral condyle and superior shaft of tibia 
I = By a tendon onto cuneiform and 1st metatarsal 
A = Dorsiflexion, inverts foot, supports logitudinal arch
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66
Q

Extensor digitorum longus

A
O = Lateral condyle of tibia, proximal fibula 
I = By a tendon that divides into 4 to insert at middle and distal phalanges of digits 2-5 
A = Extension of digits, dorsifelxion
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67
Q

Extensor hallucis longus

A
O = Shaft of fibula 
I = by a tendon onto the distal phalanx of digit 1 
A = Extends big toe, dorsiflexion
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68
Q

Fibularis longus

A
O = Head and shaft of fibula 
I =  By a long tendon to 1st metatarsal and medial cuneiform 
A = Plantar flexion and eversion of the foot
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69
Q

Gastrocnemius

A
O = Two heads, medial and lateral condyles of the femur 
I = Calcaneus by way of the calcaneal tendon 
A = Plantar flexes the foot when knee is extended; flexes the leg at the knee.
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70
Q

Soleus

A
O = Proximal end of tibia and fibula 
I = Calcaneus by way of the calcaneal tendon 
A = Plantar flexes the foot
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71
Q

Popliteus

A
O = Lateral condyle of femur 
I = Proximal end of the tibia 
A = Flexes and rotates leg medially
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72
Q

Tibialis Posterior

A
O = superior part of tibia and fibula 
I = tarsals, metatarsals 2-4 
A = inverts foot, plantar flexes foot
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73
Q

Flexor digitorum longus

A
O = Posterior surface of tibia 
I = Distal phalanges of 2-5th digits 
A = Flexes the digits , plantar flexes and inverts the foot
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74
Q

Flexor hallucis longus

A
O = Shaft of fibula 
I = Distal phalanx of 1st digit 
A = Flexes the big toe, inverts the foot
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75
Q

Fibularis brevis

A
O = Distal part of shaft of fibula 
I = by a tendon onto the proximal end of the 5th metatarsal 
A = Plantar flexion and eversion of the foot
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76
Q

Dendrites

A

Branched processes at proximal end of neuron. They form synapses with axon terminals of other neurons . Stimulated by proceeding cell and conducts impulses to cell bodies.

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77
Q

Axon

A

Single process from cell body but may branch into collateral axons. Carries impulse away from cell body and terminates in axon terminals.

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78
Q

Axon hillock

A

Widened base of axon. Point where axon arises from cell body.

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79
Q

Myelin Sheath

A

Axon covering of some peripheral neurons. Composed of lipoprotein molecules within Scwann Cells. Outer layer is called neurilemma.

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80
Q

Axon terminals

A

Branched distal end of axon that forms synapses with dendrites of next cell or neuromuscular junction. Stores neurotransmitter.

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81
Q

Node of Ranvier

A

Gaps in myelin sheath. Nerve impulse moves down axon from node to node.

82
Q

Schwann Cell

A

Neuroglial cell of the PNS. Wraps around axon like a jelly roll. Produces the myelin cell.

83
Q

Cell body of neuron

A

Also called soma. Contains nucleus and organelles. Receives impulses from dendrites. Conducts impulse to axon.

84
Q

Spinal Cord

A

Extends from medulla oblongata through foramen magnum. Pia mater is fused directly to surface.

85
Q

Cervical nerves

A

8 pairs. C1-C8. Exit between cervical vertebrae.

86
Q

Thoracic Nerves

A

12 pairs. T1-T12. Exit between the thoracic vertebrae

87
Q

Lumbar nerves

A

5 pairs. L1-L5. Exit between lumbar vertebrae.

88
Q

Sacral Nerves

A

5 pairs. S1-S5. Exit through sacral foramina

89
Q

Coccygeal nerves

A

One pair of nerves. Co1. Exit below the sacrum

90
Q

Conus Medullaris

A

Cone-shaped end to the spinal cord. In an adult, about the level of L1 or L2 vertebrae. Only nerves fill the spinal cavity below this point.

91
Q

Cauda Equina

A

Term means horse tail. Describes the collection of spinal nerves extending from conus medullaris.

92
Q

Dorsal gray horn

A

Also called posterior gray horn. Location on sensory nuclei.

93
Q

Central canal

A

Runs length of spinal cord. Contains cerebrospinal fluid.

94
Q

Dorsal root

A

Contains axons of sensory neurons. Carries sensory information to spinal cord.

95
Q

Dorsal root ganglion

A

Contains cell bodies of sensory neurons.

96
Q

Spinal Nerve

A

Contains both sensory and motor neurons running between spinal cord and rest of body.

97
Q

Ventral root

A

Contains axons of motor neurons. Carries motor commands to effector organs.

98
Q

Gray commissure

A

Connection between two sides of spinal cord

99
Q

Ventral gray horn

A

Also called anterior gray horn. Contains motor nuclei to skeletal muscles.

100
Q

Lateral gray horn

A

Only in thoracic and lumbar regions of spinal cord. Location of motor nuclei to internal organs.

101
Q

Dorsal white column

A

Also called posterior white column. Lies between posterior median sulcus and dorsal gray horn. Carries ascending sensory tracts.

102
Q

Lateral White Column

A

Lies between dorsal and ventral gray horns. Carries ascending sensory tracts and descending motor tracts.

103
Q

Ventral white column

A

Also called anterior white column. Lies between anterior median fissure and ventral gray horn. Carries ascending sensory tracts and descending motor tracts

104
Q

Ventral white commissure

A

Connects ventral white columns. Consists of myelinated axons crossing from one side of spinal cord to another.

105
Q

Phrenic Nerve

A

Cervical plexus. Is not shown on nerve board.
Skin: Does not innervate skin
Muscle: diaphragm

106
Q

Axillary Nerve

A

Brachial plexus.
Skin: Shoulder
Muscle: Deltoid

107
Q

Musculocutaneous Nerve

A

Brachial Plexus
Skin: Lateral forearm
Muscle: Flexor muscles of arm

108
Q

Median Nerve

A

Brachial Plexus
Skin: Anterolateral hand
Muscle: Flexor muscles of forearm and finger flexors

109
Q

Ulnar Nerve

A

Brachial Plexus
Skin: Medial hand
Muscle: Wrist and many hand muscles

110
Q

Radial Nerve

A

Brachial Plexus
Skin: Posterolateral arm
Muscle: Triceps brachii and extensor muscles of forearm and wrist

111
Q

Lateral femoral cutaneous Nerve

A

Lumbar Plexus
Skin: Anterior, lateral and posterior thigh
Muscle: Does not innervate muscle

112
Q

Femoral nerve

A

Lumbar Plexus
Skin: Anteromedial thigh, medial leg and foot
Muscle: Anterior thigh muscle

113
Q

Obturator Nerve

A

Lumbar Plexus
Ski: Medial thigh
Muscle: Adductor muscles of thigh

114
Q

Saphenous Nerve

A

Lumbar Plexus
Skin: Medial leg
Muscle: Does not innervate muscle

115
Q

Sciatic Nerve

A

Sacral Plexus
Skin: Does not innervate skin
Muscle: Posterior thigh muscles

116
Q

Tibial Nerve

A

Sacral Plexus
Skin: Posterior leg and sole of foot
Muscle: Knee flexors and ankle plantar flexors

117
Q

Common fibular nerve

A

Sacral Plexus.
Skin: Anterior leg and dorsum of foot.
Muscle: Dorsiflexors of ankle

118
Q

Frontal lobe

A

Cerebrum. Anterior region.

Functions: Conscious thought, memory storage, motor control, judgement, problem solving and emotion

119
Q

Precentral Gyrus

A

Prominent gryus in frontal lobe. Lies anterior to central sulcus. Also called primary motor cortex.
Functions: Initiates motor commands to skeletal muscles.

120
Q

Central Sulcus

A

Separates frontal and parietal lobes

121
Q

Postcentral Gyrus

A

Prominent gyrus in parietal lobe. Lies posteriorly to central sulcus. Also called somatosensory area.
Functions: Receives sensations of touch, pressure, pain, vibration, and temperature from skin, muscles, tendons and joints

122
Q

Parietal Lobe

A

Superior region.

Functions: Analyzing sensory stimuli

123
Q

Occipital lobe

A

Posterior region

Functions: Receives visual stimuli from photoreceptors in the eye.

124
Q

Temporal Lobe

A

Lateral region.

Functions: Receives auditory stimuli from cochlea of ear.

125
Q

Septum Pellucidum

A

Partition that separates each lateral ventricle.

126
Q

Corpus Callosum

A

Large tract of white matter that interconnects the cerebral hemispheres.

127
Q

Fornix

A

Tract of white matter along the inferior border o spetum pellucidum. Interconnects regions of cerebrum with the mammillary bodies.

128
Q

Choroid plexus

A

Vascular tissue in roof of third ventricle that secretes cerebrospinal fluid.

129
Q

Thalamus

A

Gray matter that forms walls of third ventricle and relays sensory information to correct region of cerebrum

130
Q

Epithalamus

A

Forms roof of diencephalon. Contains pineal gland and choroid plexus

131
Q

Pineal gland

A

Part of epithalamus. An endocrine gland that secretes melatonin and regulates circadian rhythm

132
Q

Mammillary Body

A

Gray matter of the hypothalamus that controls eating and swallowing reflexes

133
Q

Pituitary gland

A

An endocrine gland connected to hypothalamus by stalk of tissue called infundibulum. Secretion is regulated by hypothalamus.

134
Q

Hypothalamus

A

Lies below thalamus. Regulates appetite, thirst and body temp. Controls the pituitary gland

135
Q

Optic chiasm

A

Point at which optic nerves cross

136
Q

Superior colliculi

A

Part of the midbrain. Form the corpora quadrigemina with inferior colliculi. Controls visual reflexes.

137
Q

Inferior Colliculi

A

Part of the midbrain. Form the corpora quadrigemina with superior colliculi. Controls auditory reflexes.

138
Q

Arbor Vitae

A

Network of white matter inside cerebellum

139
Q

Cerebellum

A

Works with cerebrum to coordinate skeletal muscles

140
Q

Fourth ventricle

A

Located anterior to cerebellum

141
Q

Cerebral aqueduct

A

Connects third and fourth ventricles

142
Q

Medulla Oblongata

A

Regulates blood pressure, heart rate, and force of contraction, and respiratory rate. All ascending and descending motor impulses pass through here. Site where many fibers cross to the other side. Continuous with spinal cord.

143
Q

Pons

A

Name means bridge. Links cerebellum with rest of brain.

144
Q

Midbrain

A

Contains cerebral peduncles. Located between pons and diencephalon. Path for descending fibers to cerebellum and medula.

145
Q

Dura mater

A

Forms a tough, protective sac. Periosteal layer fused to periosteum of skull and meningeal layer becomes outer covering for brain

146
Q

Arachnoid mater

A

Middle layer of meninges lying deep to dura mater. Thin layer of interstitial fluid separates two layers, Connected to pia mater by web-like filaments

147
Q

Pia mater

A

Deepest layer of meninges. Fused to surface of brain

148
Q

Subarachnoid space

A

Between arachnoid and pia mater. Contains cerbrospinal fluid.

149
Q

Olfactory

A

Sensory

150
Q

Optic

A

Sensory

151
Q

Oculomotor

A

Motor

152
Q

Trochlear

A

Motor

153
Q

Trigeminal

A

Both

154
Q

Abducens

A

motor

155
Q

Facial

A

Both

156
Q

Vestibulocochlear

A

Sensory

157
Q

Glossopharyngeal

A

both

158
Q

Vagus

A

both

159
Q

Accessory

A

motor

160
Q

Hypoglosseal

A

motor

161
Q

The reflex arc

A
  1. Sensory recepor
  2. Sensory Neuron
  3. Integrating Center
  4. Motor Neuron
  5. Effector organ
162
Q

Monosynaptic reflex

A

Consists of only two neurons. Sensory neuron synapses directly on motor neuron. Only one synapse between neurons. Simplest and fastest type of reflex. Ex patellar reflex.

163
Q

Polysynaptic Reflex

A

Consists of at least three neurons. Sensory neuron synapses on interneuron. Interneuron synapses on motor neuron. A minimum of two synapses. Most reflexes are polysynaptic. Example, flexor withdrawal reflex

164
Q

Lacrimal Sac

A

Collects tears draining away from eye in lacrimal canalliculi. Empties into nasalaterol duct

165
Q

Trochlea

A

Loop of fibrous tissue. Tendon of superior oblique mucle passes through it.

166
Q

Superior oblique

A

Turns eyeball inferiorly and laterally

167
Q

Medial rectus

A

Turns eyeball medially

168
Q

Lateral Rectus

A

Turns eyeball laterally

169
Q

Inferior Oblique

A

Turns eyeball superiorly and laterally

170
Q

Inferior rectus

A

Turns eyeball inferiorly

171
Q

Superior rectus

A

Turns eyeball superiorly

172
Q

Sclera

A

Commonly called “white of the eye” Supports shape of the eye. Extrinsic eye muscles insert into it.

173
Q

Choroid

A

Extensive capillary network that supplies oxygen and nutrients to internal eye structures

174
Q

Retina

A

Houses photoreceptors, rods, and cones.

175
Q

Macula lutea

A

Highest concentration of photoreceptors

176
Q

Fovea centralis

A

Shallow pit in center of macula lutea. Site of sharpest vision, contains only cones. Image of object you are looking out falls on fovea.

177
Q

Optic nerve

A

Cranial nerve 2. formed by axons from neural tunic.

Carries visual information to brain

178
Q

Optic disk

A

Point at which axons from retinal neurons converge to form optic nerve. Contains no photoreceptors. also called blind spot.

179
Q

Posterior Cavity

A

Area between lens and retina. Contains virteous humor, a semi-solid gel-like substance

180
Q

Anterior Cavity

A

Area between cornea and lens. Anterior chamber-between cornea and iris and posterior chamber between iris and lens. Contains aqueous humor, a watery fluid that circulates through anterior cavity.

181
Q

Ora Serrata

A

Inferior edge of neural tunic

182
Q

Pupil

A

Opening in the center of iris. Size changes depending on light situtaitons and contraction or relaxtion of iris muscles

183
Q

Iris

A

Consists of two intrinsic eye muscles that contract or relax to regulate amount of light entering the eyeball. Both are smooth muscle

184
Q

Cornea

A

Anterior portion of fibrous tunic. Transparent, allows light to enter eyeball. It’s curve focuses light rays to retina.

185
Q

Ciliary Muscle

A

An intrinsic eye muscle. Constriction reduces tension on suspensory ligaments and lens. Relaxation increases tension on suspensory ligaments and lens

186
Q

Ciliary Process

A

Attachment site for suspensory ligaments. Secretes aqueous humor.

187
Q

Lens

A

Changes shape to focus light onto retina

188
Q

Auricle

A

The visible external portion of the ear. Also called the pinna.

189
Q

Auditory Ossicles

A

Three smallest bones in the body. Span the middle ear. Carry mechanical vibration from lymphatic membrane to oval window. Malleus, Incus, Stapes.

190
Q

Auditory tube

A

Also called the Eustachian tube. Connects middle ear to pharynx. Opens when you swallow to equalize air pressure in middle ear.

191
Q

Oval Window

A

Divides middle and inner ear. Attached to stapes. Carries vibrations into inner ear.

192
Q

Tympanic membrane

A

Eardrum. Separates outer from middle ear. Vibrates like a drum head when struck by sound waves. This converts sound waves into physical movements (mechanical vibration)

193
Q

External auditory meatus and canal

A

External opening and canal that captures and carries sound waves to tympanic membrane. Secretes cerumen.

194
Q

Semicircular canals

A

Three circular canals: anterior, posterior and lateral. Houses sensory receptor cells for equilibrium. Base of each canal is the ampulla which contains hair cells in a structure called the crista.

195
Q

Cochlear duct

A

Contains endolymph. Houses sensory receptor cells for hearing, the organs of Corti. Hair cells are bent by sound waves.

196
Q

Cochlea

A

Part of bony labyrinth. Curled into a spiral. Houses cochlear duct.

197
Q

Round window

A

Membrane covered opening between cochlea and middle ear

198
Q

Saccule

A

Detects vertical acceleration. (Riding in an elevator)

199
Q

Utricle

A

Detects horizontal acceleration. (Speeding up in a car)

200
Q

Vestibule

A

Region consists of utricle and saccule.