LECTURE 9 muscles and innervation of upper extremity

Question 1

if a muscle’s origin is on the scapula it moves?

Answer 1

the arm

Question 2

if a muscle’s insertion is on the scapula it moves?

Answer 2

the scapula

Question 3

muscles with origin on scapula

Answer 3

subscapularis, supraspinatus, infraspinatus, teres minor, teres major, latissimus dorsi (partial attachment)

Question 4

muscles with insertion on scapula

Answer 4

rhomboids, trapezius, pectoralis minor, serratus ventralis, levator scapula

Question 5

arm compartments

Answer 5

anterior compartment (3 muscles, flexors of forearm and arm), posterior compartment (1 muscle, extensor of forearm and arm)

Question 6

muscles in anterior compartment of arm

Answer 6

brachialis, coracobrachialis, long head biceps brachii, short head biceps brachii

Question 7

muscles in posterior compartment of arm

Answer 7

long head triceps brachii, medial head biceps brachii, lateral head biceps brachii

Question 8

origin of brachialis

Answer 8

anterior shaft, distal of humerus

Question 9

insertion of brachialis

Answer 9

coronoid process/ulnar tuberosity of ulna

Question 10

action of brachialis

Answer 10

flex forearm

Question 11

innervation of brachialis

Answer 11

musculocutaneous nerve

Question 12

origin of long head of biceps brachii

Answer 12

supraglenoid tubercle of scapula

Question 13

origin of short head of biceps brachii

Answer 13

coracoid process of scapula

Question 14

insertion of biceps brachii

Answer 14

radial tuberosity of radius

Question 15

action of biceps brachii

Answer 15

flex forearm, supination

Question 16

innervation of biceps brachii

Answer 16

musculocutaneous nerve

Question 17

origin of coracobrachialis

Answer 17

coracoid process of scapula

Question 18

insertion of coracobrachialis

Answer 18

medial surface midshaft of humerus

Question 19

action of coracobrachialis

Answer 19

flex arm, adduct arm

Question 20

innervation of coracobrachialis

Answer 20

musculocutaneous nerve

Question 21

origin of long head of triceps brachii

Answer 21

infraglenoid tubercle of scapula

Question 22

origin of medial head of triceps brachii

Answer 22

posterior shaft of middle humerus

Question 23

origin of lateral head of triceps brachii

Answer 23

posterior shaft of proximal humerus

Question 24

insertion of triceps brachii

Answer 24

common tendon to olecranon of ulna

Question 25

action of triceps brachii

Answer 25

extend forearm, assist with extension of arm

Question 26

innervation of triceps brachii

Answer 26

radial nerve

Question 27

description of forearm muscles

Answer 27

cross wrist and finger joints (some cross elbow), movement of hand and fingers, proximally are fleshy, distally have long tendons, flexor and extensor retinacula (“wristbands”): keep tendons from jumping outwards when tensed

Question 28

description of muscles of anterior compartment of forearm

Answer 28

superficial and deep layers, flexors of hand and fingers, superficial flexors have common origin on medial epicondyle, contains 2 pronator muscles

Question 29

description of muscles of posterior compartment of forearm

Answer 29

superficial and deep layers, extensors of hand and fingers, superficial extensors have common origin on lateral epicondyle, contains a supinator muscle

Question 30

superficial muscles of anterior compartment of forearm

Answer 30

pronator teres (median), flexor carpi radialis (median), palmaris longus (median), flexor digitorum superficialis (median), flexor carpi ulnaris (ulnar)

Question 31

deep muscles of anterior compartment of forearm

Answer 31

pronator quadratus (median), flexor pollicis longus (median), flexor digitorum profundus (ulnar medial half, median lateral half)

Question 32

superficial muscles of posterior compartment of forearm

Answer 32

anconeus (radial), brachioradialis (radial), extensor carpi radialis longus and brevis (radial), extensor digitorum (radial), extensor digiti minimi (radial), extensor carpi ulnaris (radial)

Question 33

deep muscles of posterior compartment of forearm

Answer 33

supinator (radial), abductor pollicis longus (radial), extensor pollicis longus and brevis (radial), extensor indicus (radial)

Question 34

muscles of the pinky

Answer 34

hypothenar muscles: all digiti minimi (flexor, abductor, opponens) (ulnar)

Question 35

muscles of the thumb

Answer 35

thenar muscles: abductor pollicis brevis (median), flexor pollicis brevis (median), opponens pollicis (median), adductor pollicis (ulnar)

Question 36

intrinsic muscles of the hand

Answer 36

palmar and dorsal intercossei (ulnar), lumbricals (median and ulnar)