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Bio 125 > Muscle Actions > Flashcards

Muscle Actions Flashcards

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Biology 101 flashcards
1
Q

Buccinator

A

compresses cheek, pulls the corner of the mouth laterally

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2
Q

Epicranius frontal belly

A

wrinkles the skin of the forehead and elevates eyebrows (facial expressions)

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3
Q

Epicranius occipital belly

A

fix scalp in place or retract it

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4
Q

Orbicularis Oris

A

closes and purses lips

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5
Q

Orbicularis oculi

A

Closes eyes, allows to blink, wink and squint. Also lowers eyebrows.

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6
Q

Platysma

A

tenses skin of neck and pulls lower lip down and back. Also helps lower the mandible

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7
Q

Zygomaticus major and minor

A

pulls the corner of the mouth upward

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8
Q

masseter

A

raises mandible to close mouth

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9
Q

temporalis

A

raise and retract mandible

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10
Q

digastric

A

raises the hyoid and lowers mandible. (used in speech, swallowing and chewing)

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11
Q

sternocleidomastoid

A

flexes the neck when both are contracted, rotates the head and points face toward opposite shoulder when only one is contracted.

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12
Q

Deltoid

A

Main muscle that abducts arm, flexes and extends arm, rotates humerus.

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13
Q

Pectoralis major

A

main muscle that flexes the arm or humerus, adducts the arm, medially rotates the arm, and elevates chest upward.

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14
Q

Pectoralis minor

A

protract and lowers scapula, elevates rib cage

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15
Q

serratus anterior

A

superior rotation of scapula, protract scapula, causes punching or pushing movement

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16
Q

external intercostals

A

raises ribcage when inhaling

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17
Q

internal intercostals

A

lowers ribcage when exhaling

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18
Q

diaphram

A

moves down and flattens when you inhale, bulges upward when exhaling

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19
Q

rectus abdominus

A

flexes and rotates vertebral column, increases abdominal pressure, steadies the pelvis when walking, lowers ribcage

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20
Q

transverse abdominus

A

helps to support abdominal contents

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21
Q

external oblique and internal oblique

A

compresses abdominal wall, laterally flexes vertebral column, steadies vertebral column when lifting something heavy, plays a role in posture, plus all rectus abdominus actions.

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22
Q

linea alba

A

tendon-like band between rectus abdominus

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23
Q

what does the erector spinae group consist of

A

iliocostalis, longissimus, spinalis

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24
Q

erector spinae group

A

extend and laterally flex their vertebral column, and extends and rotates the neck

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25
Q

trapezius

A

raises, lowers scapula, rotates and pulls scapula toward midline

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26
Q

latissimus dorsi

A

main muscle that extends the arm, adducts arm, rotates humerus medially

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27
Q

teres minor

A

rotates humerus laterally

28
Q

supraspinatus

A

abducts arm

29
Q

infraspinatus

A

rotates humerus laterally

30
Q

subscapularis

A

rotates humerus medially

31
Q

rhomboid minor and major

A

rotates scapula to help lower arm, helps pull scapula toward midline

32
Q

levator scapulae

A

helps pull scapula toward midline, elevates scapula, laterally flexes the neck.

33
Q

Coracobrachialis

A

flexes and rotates humerus medially

34
Q

Biceps brachii

A

main muscle that flexes the forearm, also supinates forearm

35
Q

brachialis

A

flexes forearm

36
Q

brachioradialis

A

flexes forearm

37
Q

triceps brachii

A

main muscle that extends forearm

38
Q

supinator

A

supinates forearm

39
Q

pronator teres

A

rotate (pronate) forearm

40
Q

flexor carpi radialis

A

flexes wrist, abducts hand

41
Q

flexor carpi ulnaris

A

flexes wrist, adducts hand

42
Q

flexor digitorum superficialis

A

flexes fingers and wrist (not thumb)

43
Q

flexor digitorum profundus

A

flexes fingers and wrist (not thumb)

44
Q

flexor pollicus longus

A

thumb flexor

45
Q

pulmaris longus

A

flexes wrist, tenses skin of palm

46
Q

flexor retinaculum

A

holds flexor tendons in the wrist (connective tissue collar)

47
Q

extensor carpi radialis longus

A

extends wrist, abducts hand

48
Q

extensor carpi radialis brevis

A

extends wrist, abducts hand

49
Q

extensor carpi ulnaris

A

wrist extender, adducts hand

50
Q

extensor digitorum

A

finger and wrist extender

51
Q

extensor pollicis longus

A

thumb extender

52
Q

extensor pollicis brevis

A

thumb extender

53
Q

extensor retinaculum

A

holds extensor tendons on wrist (connective tissue collar)

54
Q

iliopsoas

A

consists of psoas major and illiacus

55
Q

illiacus

A

flex the thigh and vertebral column, laterally flexes vertebral column

56
Q

sartorius

A

flexes thigh, abducts thigh and rotates thigh laterally, also flexes leg

57
Q

gracilis

A

adducts thigh, flexes and medially rotates leg below the knee

58
Q

gluteus maximus

A

abducts thigh, rotates thigh laterally, extends thigh when walking up an incline

59
Q

gluteus medius and minimus

A

abducts thigh, rotates thigh medially, steadies pelvis

60
Q

tensor fasciae latae

A

flex thigh, abduct thigh, rotate thigh medially, steadies trunk and braces the knee

61
Q

adductor longus and brevis

A

adducts thigh, rotates thigh medially, flexes thigh

62
Q

adductor mangus

A

adducts thigh, rotate thigh medially, can flex the thigh, extend thigh

63
Q

quadriceps group

A

consists of rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius

64
Q

rectus femoris

A

extends leg, stabilizes the knee, flexes thigh and vertebral column

65
Q

vastus lateralis, medialis, and intermedius

A

extends leg, stabilizes the knee

66
Q
A

Bio 125 (6 decks)

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