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Anatomy 3 > Week 9 - Reflexes > Flashcards

Week 9 - Reflexes Flashcards

1
Q

Describe the stretch reflex

A

Contraction of the muscle as a response to muscle stretching

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2
Q

Testing stretch and tendon reflexes of the biceps brachii involves which dermatomes?

A

C5-C6

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3
Q

Testing stretch and tendon reflexes of the triceps brachii involves which dermatomes?

A

C6-C8

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4
Q

Testing stretch and tendon reflexes of the quadriceps femoris involves which dermatomes?

A

L2-L4

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5
Q

Testing stretch and tendon reflexes of the gastrocnemius involves which dermatomes?

A

S1-S2

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6
Q

Describe the tendon reflex

A

Relaxation of agonist muscle, Contraction of antagonist muscle

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7
Q

The stretch reflex is a ________ reflex

A

monosynaptic

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8
Q

Describe the Flexor/Withdrawal reflex arc

A
  • noxious stimuli (pain) -> afferent branch synapses on inter-neuron
  • somatic motor neurons to a) the same side muscles: flexion/withdrawal and b) somatic motor neurons to opposite side muscles
  • cross extension
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9
Q

The blood supply of the spinal cord consists of _______

A

one anterior and two posterior spinal arteries

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10
Q

The gag (aka _______) reflex sensory input via ______ and motor reaction as gagging via ______

A

pharyngeal
CN IX - Glossopharyngeal
CN X - Vagus

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11
Q

The tendon reflex is a ________ reflex

A

polysynaptic

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12
Q

Which anterior rami do not participate in peripheral nerve plexi?

A

T2 - T12

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13
Q

The cervical plexus includes anterior rami of _______. Notable nerves arising from the cervical plexus include _______

A

C1-C5

Ansa cervicalis, phrenic

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14
Q

Which cranial nerves join the cervical plexus?

A

CN XI, XII

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15
Q

The phrenic nerves arise from the cervical plexus as anterior rami of _____. It’s function is _______

A

C3-C5

stimulate diaphragm for respiration

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16
Q

What are dermatomes?

A

Skin segments or areas ennervated by afferent fibers from one spinal nerve

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17
Q

Each dermatome overlaps with ________

A

two adjacent dermatomes

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18
Q

If three adjacent dermatomes are affected by three corresponding spinal cord injuries, it will result in

A

anesthesia

19
Q

Paresthesia is __________

A

abnormal sensation along one or several dermatomes - pins, needles, numbness

20
Q

Analgesia is ________

A

abolished or diminished pain sensation

21
Q

A reflex is ________

A

inherent ability to briskly adjust body automatically to return body to homeostasis

22
Q

The integrative center of cranial reflexes is _________

A

brainstem

23
Q

The shoulder dermatomes are _______

A

C4-C6

24
Q

The Thumb & Index finger dermatomes are ______

A

C6

25
Q

The middle finger dermatomes are ______

A

C7

26
Q

The ring and pinkie finger dermatomes are _______

A

C8

27
Q

The nipple dermatomes is ________

A

T4

28
Q

The umbilicus dermatome is ______________

A

T10

29
Q

The knee dermatome is _________

A

L3

30
Q

The ball of the foot, big toe dermatome is _________

A

L5

31
Q

The foot sole dermatome is _________

A

S1

32
Q

What are the componenets of a reflex arc?

A 
sensory receptor of an organ/tissue
sensory neuron
integrative center
motor neuron
effector organ/tissue adjustment
33
Q

The ansa cervicalis nerve arises from the cervical plexus as anterior rami of _____. Its function is _____

A

C1-C3

to stabilize hyoid bone, larynx during speaking and swallowing

34
Q

The brachial plexus includes anterior rami of ______. Notable nerves arising from the brachial plexus include ________

A

C5-T1

musculocutaneous, axilary, radial, median, ulnar, long thoracic

35
Q

The musculocutaneous nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C5-C6
coracobrachialis, brachialis, biceps brachii
elbow flexion and supination

36
Q

The axilary nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C5-C6
Deltoid, teres minor
shoulder abduction

37
Q

The radial nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C5-T1
Extensors of the upper extremity
Extension in multiple joints

38
Q

The median nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C6-T1
forearm flexors except f. carpi ulnaris & lateral 1/2 of f. digitorum profundus, instrinsic thumb muscles, lateral 2 lumbricals
wrist and lateral finger flexion, wrist abduction, thumb movements

39
Q

The ulnar nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C7-T1
F. carpi ulnaris and medial 1/2 of f. digitorum profundus, medial 2 lumbricals
Wrist adduction/flexion, flexion of 2 medial fingers, abduction and adduction of 2nd-5th fingers

40
Q

The long thoracic nerve arises from anterior rami of _______. It ennervates _______ and controls _______

A

C5-C7
serratus anterior muscle
upward rotation of the scapula

41
Q

The accomodation reflex of the of eye is dependent upon which cranial nerves? Identify which is sensory and which is motor.

A

CN II - Optic - Sensory

CN III - Oculomotor - Motor

42
Q

The pupillary light reflex of the eye is dependent upon which cranial nerves? Identify which is sensory and which is motor.

A

CN II - Optic - Sensory

CN III - Oculomotor - Motor

43
Q

The corneal reflex requires sensory input via ______ and motor reaction as blinking via ______

A

CN V - Trigeminal

CN VII - Facial

Anatomy 3 (12 decks)

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