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Bio 20A > Muscles of the Body > Flashcards

Muscles of the Body Flashcards

Lab & Written

1
Q

Obicularis Oculi

A

O: Round muscle around the eye
A: Closing the eye

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2
Q

Obicularis Oris

A

Round muscle around the lips
A: Lip pursing

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3
Q

Frontalis

A

O: Attached to the frontal lobe
A: raises eyebrows

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4
Q

Buccinator

A

Underneath eyes and masseter
A: pulls cheeks in (fish face).

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5
Q

Zygomaticus

A

O:Attached to the zygomatic bone
A: Pulls up corners of your mouth (smile)

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6
Q

Depressor labii inferiors

A

V below the lower lip
A: Pulls the lower lip down

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7
Q

Temporalis

A

O: Temporal bone
I: Mandible
A: Closing the mouth + pulling the mandible back

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8
Q

Masseter

A

big muscle posterior jaw that runs up + down,
I: Mandible
A: raises mandible, most important for chewing in humans, pulls mandible forward

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9
Q

Sternocleidomastoid

A

Big muscle in the neck going at an angle
O: Sternum
I: Temporal bone
A: flexes neck - if one contracts the neck is pulled to the side

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10
Q

Platysma

A

Flat muscle in front of the neck, on top of the sternocleidomastoid
A: pulls down corners of lips (chinz face)

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11
Q

Pectoralis Major

A

O: Pones of the chest
I: Lateral end of humerus
A: Adducts & flexes arm

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12
Q

Pectoralis minor

A

A: Stabilizes the scapula

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13
Q

External Intercostal Muscles

A

O: Ribs 1-11
I: Immediately below the origin
A: Expanding the rib cage to breathe

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14
Q

Internal Intercostal Muscles

A

O: Ribs 1-11 costal cartilage
I: Immediately below the origin
A: Pull ribs together, contract rib cage, breathe out

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15
Q

Serratus anterior

A

A: Pulls the scapula towards the ribs

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16
Q

Rectus abdominis

A

A: flexes torso/abdomen,
contracts abdominal cavity (for) - defecation, childbirth, breathing out

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17
Q

Transverse abdominis

A

A: Contracts the abdominal cavity for rotation

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18
Q

External oblique

A

Up from midline towards back of ribs
A: Flexion, rotation, lateral flex

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19
Q

Internal obliques

A

down from midline towards iliac crest
A: Flexion, rotation, lateral flex, structural support

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19
Q

Trapezius

A

O: Processes of vertebrae
I: Scapula and occipital
A: Pulls the scapula down + in
* Extends the neck
* Antagonist to sternocleido mastoid

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20
Q

Latissimus Dorsi

A

I: Anterior of the humerus
A: Adduction of the arm at shoulder - like pec maj
* Extends arm (pulls back) - antagonist

Pulling down

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21
Q

Teres Major

A
  • Below infraspinatus
  • Weak adductor of arm
  • Rotates the arm towards the body
22
Q

Infraspinatus

A

Rotates arm away from the body
Over the scapula
Stabilizes scapula

23
Q

Serratus posterior inferior

A

A: Pulls rib cage in
Contract thoracic cavity
For breathing out

under the neck and upper traps

24
Q

Rhomboid

A

Pulls back + stabilizes scapula

25
Q

Erector Spinae

A

O: Lumbar & thoracic region
I: Processes of vertebrae
A: Extends torso & Standing up straight

26
Q

Deltoid

A

A: Abducts the arm

27
Q

Biceps Brachii

A

I: Radius
A: Flexes + supinates lower arm at the elbow, Lifts the radius

28
Q

Brachialis

A

I: Ulna
A: Lifts the ulna

29
Q

Triceps Brachii

A

I: Ulna
A: Extends the arm at the elbow
Antagonist to biceps brachii, brachialis, brachioradialis

30
Q

Brachioradialis

A

O: Distal humerus
I: Distal radius
A: Rotation + supination

31
Q

Flexor capri radialis

A

Just medial to brachioradialis
Tendon touches hand under the thumb

A: Flexes + adducts the hand

32
Q

Palmaris longus

A

In the middle of the forearm
A: Flexor of the hand (weak)

33
Q

Flexor capri ulnaris

A

Along the ulna side of the arm
A: Flexes the hand at the wrist & Adducts hand

34
Q

Extensor radialis longus

A

Back side of the arm
Radial side
Right next to brachioradialis
A: Extends the hand at the wrist & Abducts the hand

35
Q

Extensor digitorum

A

back side of arm / digits + fingers
I: Phalanges
A: Extend digits

36
Q

Extensor carpi ulnaris

A

back side of arm / wrist + ulna
A: Extends the hand at the wrist & Adducts hand

37
Q

Gluteus Maximus

A

I: Femur
A: hip abduction and leg rotation & Postural - for standing
Lots of slow twitch

38
Q

Adductor longus

A

Wider muscle under the gracilis
A: Adduct the legs

39
Q

Gracilis

A

A: Adduct the legs
Inserts into the tibia to adduct the whole legs

40
Q

Semitendinosus

A

middle narrow hamstring muscle
A: knee flexion

41
Q

Biceps femoris

A

Lateral hamstring muscle
A: knee flexion

42
Q

Semimembranosus

A

wider + medial, deep to the semitendinosus
A: knee flexion

43
Q

Sartorius

A

A: leg crossing

44
Q

Rectus femoris

A

Big middle quad
I: Tibia
A: Leg extension & knee flexion

45
Q

Vastus medialis

A

Medial to rectus femoris
I: Tibia
A: Leg extension & knee flexion

46
Q

Vastus lateralis

A

Lateral to rectus femorus
I: Tibia
A: Leg extension & knee flexion

47
Q

Vastus intermedius

A

Deep, not on the models
I: Tibia
A: Leg extension & knee flexion

48
Q

Tensor fascia latae

A

Muscle in the middle of the IT band
A: Abduction, flexion, + medial rotation

49
Q

Iliotibial band

A

A: Attaching the tensor fascia latae and glutes to the tibia

50
Q

Tibialis Anterior

A

shin muscle
A: Dorsiflex’s the foot

51
Q

Gastrocnemius

A

I: Calcaneus
A: More fast twitch muscles - running, walking, jumping (plantar flexion)

52
Q

Soleus

A

I: Calcaneus
A: More slow twitch fibers - postural + standing (plantar flexion)

Bio 20A (21 decks)

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