muscles of the shoulder and arm

Question 1

what is the function of pectoralis major

Answer 1

flexes, adducts, and medially rotates the arm

Question 2

what is the function of latissimus dorsi?

Answer 2

medial rotation, adduction, and extension of the arm

Question 3

what is the function of the deltoid?

Answer 3

abduction, flexion, lateral and medial rotation of the arm

Question 4

what is the function of the supraspinatus?

Answer 4

abducts the arm and stabilizes the shoulder

Question 5

what is the function of the infraspinatus?

Answer 5

laterally rotates the arm and stabilizes the shoulder joint

Question 6

what is the function of teres major?

Answer 6

extension, adduction, and medial rotation of the humerus

Question 7

what is the function of teres minor?

Answer 7

lateral rotation of the humerus and stabilization of the shoulder joint

Question 8

what is the function of the subscapularis?

Answer 8

medial rotation of the head of the humerus

Question 9

what is the function of the biceps branchii?

Answer 9

flexion and supination of the elbow

Question 10

what is the function of the brachiordialis and brachialis?

Answer 10

flexion of the elbow

Question 11

what is the function of the triceps branchii?

Answer 11

extension of the elbow

Question 12

what is the function of the pronator quadratus?

Answer 12

pronates the hand

Question 13

what is the function of the supinator?

Answer 13

supinates the hand and forearm

Question 14

what is the function of the flexor carpi radialis?

Answer 14

flexion and abduction of the hand

Question 15

what is the function of palmaris longus?

Answer 15

flexes the hand and wrist

Question 16

what is the function of the extensor carpi radialis?

Answer 16

extension and abduction of the wrist

Question 17

what is the function of extensor digitorum?

Answer 17

extension of the wrist; extension and abduction of digits 2-5

Question 18

what is the function of the flexor digitorum?

Answer 18

flexes digits 2-5

Question 19

what are the prime movers of the arm

Answer 19

pectoralis major, lattisimus dorsi, deltoid

Question 20

what muscles make up the rotator cuff?

Answer 20

teres minor, subscapularis, infraspinatus, supraspinatus

Question 21

what is the origin and insertion of the latissimus dorsi?

Answer 21

origin: thoracic 7-12 and lumbar 1-5, sacrum, thoracolumbar fascia, inferior part of the scapula, posterior third of the iliac crest, and ribs 9-12
insertion: intertubecular groove of the humerus

Question 22

what are the origin and insertions of pectoralis major?

Answer 22

clavicular head: origin is the medial part of the clavicle, insertion is lateral part of intertubecular groove of the humerus
abdominal head: origins are distal sternum and external oblique fascia, insertion is the lateral part of the intertubecular groove of the humerus
sternocostal head: origin is sternum and costal cartilage, insertion is lateral part of intertubecular groove

Question 23

what are the origins and insertions of the deltoid muscles?

Answer 23

anterior head: origin is the lateral third of the clavicle, insertion i the deltoid tuberosity of the lateral side of the humerus
middle head: origin is the acromion, insertion is the deltoid tuberosity of the lateral side of the humerus
posterior head: origin is scapular spine, insertion is the deltoid tuberosity of the lateral side of the humerus

Question 24

name the origins and insertions of the biceps branchii

Answer 24

long head: origin is the superglenous tubercle of the scapula and insertions are radial tuberosity and bicipital aponeurosis
short head: origin is the coracoid process of the scapula and insertion is radial tuberosity