MSK anatomy

Question 1

what is the origin of the orbicularis oculi?

Answer 1

medial margin of orbit

Question 2

what is the insertion of the orbicularis oculi?

Answer 2

skin of eyelid

Question 3

what is the action of the orbicularis oculi?

Answer 3

closes eyes

Question 4

what is the origin of the orbicularis oris?

Answer 4

maxilla and mandible

Question 5

what is the insertion of the orbicularis oris?

Answer 5

skin at the corner of the mouth

Question 6

what is the action of the orbicularis oris?

Answer 6

closes lips

Question 7

what is the origin of the temporalis?

Answer 7

temporal bone

Question 8

what is the insertion of the temporalis?

Answer 8

mandible

Question 9

what is the action of the temporalis?

Answer 9

elevate and retract the mandible

Question 10

what is the origin of the masseter?

Answer 10

zygomatic arch

Question 11

what is the insertion of the masseter?

Answer 11

mandible

Question 12

what is the action of the masseter?

Answer 12

elevates mandible

Question 13

what is the origin of the buccinator?

Answer 13

maxilla and mandible

Question 14

what is the insertion of the buccinator?

Answer 14

fibres of orbicularis oris

Question 15

what is the action of the buccinator?

Answer 15

compress cheek

Question 16

what is the origin of the sternocleidomastoid?

Answer 16

sternum and sternal end of clavicle

Question 17

what is the insertion of the sternocleidomastoid?

Answer 17

mastoid process

Question 18

what is the action of the sternocleidomastoid?

Answer 18

• head rotates left or right when one muscle contracts

- neck flexes when both contract

Question 19

what is the origin of the external intercostal muscles?

Answer 19

inferior border of rib above

Question 20

what is the insertion of the external intercostal muscles?

Answer 20

superior border of rib below

Question 21

what is the action of the external intercostal muscles?

Answer 21

inspiration, lifts the ribs

Question 22

what is the origin of the internal intercostal muscles?

Answer 22

superior border of rib below

Question 23

what is the insertion of the internal intercostal muscles?

Answer 23

inferior border of rib above

Question 24

what is the action of the internal intercostal muscles?

Answer 24

forced expiration depresses ribs

Question 25

what is the origin of the rectus abdominis?

Answer 25

superior surface of the pubic bone

Question 26

what is the insertion of the rectus abdominis?

Answer 26

- xiphoid process | - 5th-7th costal cartilage of ribs

Question 27

what is the action of the rectus abdominis?

Answer 27

flexion of trunk

Question 28

what is the origin of the trapezius?

Answer 28

- occipital bone | - cervical and throacic vertebrae

Question 29

what is the insertion of the trapezius?

Answer 29

- clavicle - spine of scapula - acromion

Question 30

what is the action of the trapezius at the neck?

Answer 30

extension

Question 31

what is the action of the trapezius at the shoulder?

Answer 31

- elevation/depression | - retraction/rotation of scapula

Question 32

what is the origin of the latissimus dorsi?

Answer 32

- lower thoracic vertebrae | - iliac crest

Question 33

what is the insertion of the latissimus dorsi?

Answer 33

humerus

Question 34

what is the action of the latissimus dorsi?

Answer 34

adduction and extension of the humerus at the shoulder joint

Question 35

what is the origin of the pectoralis major?

Answer 35

- sternum - clavicle - upper ribs

Question 36

what is the insertion of the pectoralis major?

Answer 36

greater tubercle and intertubercular sulcus of humerus

Question 37

what is the action of the pectoralis major?

Answer 37

adduction, flexion, and medial rotation. of the humerus

Question 38

what is the origin of the serratus anterior?

Answer 38

ribs 1-8/9

Question 39

what is the insertion of the serratus anterior?

Answer 39

medial border of scapula (anterior surface)

Question 40

what is the action of the serratus anterior?

Answer 40

protraction of scapula, rotates upwards

Question 41

what is the origin of the deltoid?

Answer 41

- clavicle - acromion - spine of scapula

Question 42

what is the insertion of the deltoid?

Answer 42

deltoid tuberosity of humerus

Question 43

what is the action of the deltoid?

Answer 43

abduction of humerus

Question 44

what is the origin of the biceps brachii?

Answer 44

short head: coracoid process long head: scapula above glenoid cavity

Question 45

what is the insertion of the biceps brachii?

Answer 45

radial tuberosity

Question 46

what is the action of the biceps brachii?

Answer 46

flexion and supination of forearm

Question 47

what is the origin of the triceps brachii?

Answer 47

long head: scapula, below glenoid cavity lateral and medial: posterior surface of humerus

Question 48

what is the insertion of the triceps brachii?

Answer 48

olecranon process of ulna

Question 49

what is the action of the triceps brachii?

Answer 49

extension of forearm

Question 50

what is the origin of the flexor pollicus longus?

Answer 50

radius (anterior shaft)

Question 51

what is the insertion of the flexor pollicus longus?

Answer 51

distal phalanx of thumb (anterior surface)

Question 52

what is the action of the flexor pollicus longus?

Answer 52

flexion of thumb

Question 53

what is the origin of the flexor digtorium superficialis?

Answer 53

medial epicondyle of humerus, radius, and ulna

Question 54

what is the insertion of the flexor digtorium superficialis?

Answer 54

anterior surface of phalanges

Question 55

what is the action of the flexor digtorium superficialis?

Answer 55

flexion of digit fingers

Question 56

what is the origin of the extensor digtorium?

Answer 56

lateral epicondyle of humerus

Question 57

what is the insertion of the extensor digtorium?

Answer 57

posterior surface of phalanges

Question 58

what is the action of the extensor digtorium?

Answer 58

extension of fingers

Question 59

what is the origin of the extensor pollicus longus?

Answer 59

ulna (posterior surface)

Question 60

what is the insertion of the extensor pollicus longus?

Answer 60

distal phalanx of thumb (posterior surface)

Question 61

what is the action of the extensor pollicus longus?

Answer 61

extension of fingers