MAJOR SKELETAL MUSCLES AND THEIR PRIME ACTIONS

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created 4 years ago by Zvezdi_Krasteva
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Be able to name and demonstrate the prime actions of muscles
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1

Frontalis

raises eyebrows, wrinkle forehead skin

2

Orbicularis oris

closes lips; purses and protrudes lips (kissing and whistling muscle)

3

Orbicularis oculi

closes eyes, produces blinking, squinting, and draws eyebrows inferiorly

4

Buccinator

compress cheek (as in whistling); draws corner of mouth laterally; holds food between teeth during chewing

5

Masseter

prime mover of jaw closure; elevates mandible

6

Temporalis

closes jaw; elevates and retracts mandible

7

Sternocleidomastoid

flexion of neck forward (when lying on back); rotate head toward shoulder on opposite side

8

Splenius capitis

neck extension

9

Rectus Abdominis

trunk flexion; flexes and rotates vertebral column; increases abdominal pressure; fixes and depresses ribs; stabilizes pelvis during walking; used in sit-ups and curls

10

External obliques

trunk flexion; lateral flexion; compress abdomen; compresses abdomen wall; also aids muscles of back in trunk rotation and lateral flexion; used in oblique curls

11

Transversus abdominis

compresses abdominal contents

12

External intercostals

pulls ribs toward one another to elevate rib cage; aid in inspiration

13

Internal intercostals

draw ribs together to depress rib cage; aid in forces expiration; antagonistic to external intercostals

14

Diaphragm

increases and decrease thoracic volume; prime mover of inspiration flattens on contraction; increasing vertical dimensions of thorax; increases intra-abdominal pressure

15

Trapezius

raises, rotates, and retracts (adducts) scapula and stabilizes it; extends head; superior fibers elevate scapula (as in shrugging) the shoulders); inferior fibers depress it

16

Serratus anterior

protract scapula

17

Deltoid

abducts humerus

18

Supraspinatus

adbucts humerus

19

Teres minor

laterally rotates humerus

20

Teres major

adducts and medially rotates humerus

21

Latissimus dorsi

extends, adducts and medially rotates humerus

22

Pectoralis major

flexes, adducts, and medially rotates humerus

23

Biceps branchii

flexes and supinates forearm

24

Brachioradialis

flexes forearm

25

Triceps branchii

extends forearm

26

Pronator teres

pronates forearm

27

Flexor carpi ulnaris

wrist flexion

28

Flexor carpi radialis

wrist flexion

29

Extensor capri ulnarius

wrist extension

30

Extensor carpi radialis

wrist extension

31

Flexor digitorum

finger flexion

32

Extensor digitorum

finger extension

33

Gluteus maximus

extension of the femur

34

Gluteus medius

abduction of the femur

35

Tensor fasciae latae

abduction and flexion of the femur

36

Ilipsoas

flexion of the femur

37

Adductor magnus

adduction of the femur

38

Rectus femoris

(part of the quadriceps); knee extension

39

Vastus medialis

(part of the quadriceps); knee extension

40

Biceps femoris

(part of the hamstrings); knee flexion

41

Sartorius

cross leg flexion and knee flexion

42

Gastrocnemius

plantar flexion

43

Soleus

plantar flexion

44

Peroneus

foot eversion

45

Tibialis anterior

dorsiflexion and inversion

46

Flexor digitorum longus

flexion of toes 2-5

47

Extensor digitorum longus

extension of toes 2-5

48

Flexor hallucis longus

flexion of toe 1 (great toe)

49

Extensor halluces longus

extension of toe 1 (great toe)