Upper Extremity Myology

Question 1

What innervates the deltoid muscle?

Answer 1

axillary N.

Question 2

What nerve innervates the triceps brachii m and anconeus m?

Answer 2

radial N.

Question 3

What is in the triangular space?

Answer 3

Circumflex scapular A

Question 4

What muscles does the recurrent branch of the median N innervate?

Answer 4

ABductor Pollicis Brevis M.
Superficial head of flexor Pollicis Brevis M.
Opponens Pollicis M.

All are Thenar Muscles!!!

Question 5

What nerves innervate subscapularis m.?

Answer 5

Upper and lower subscapular N.

Question 6

What is the action of supraspinatus?

Answer 6

abducts humerus

holds humeral head in glenoid cavity

Question 7

Where is the action of serratus anterior?

Answer 7

origin = ribs 1-8

protract scapula & stabilze to thoracic wall

Problem w/ innervation = winging

Question 8

What muscles does the deep radial nerve innervate of the forearm extensors?

Answer 8

extensor carpi radialis brevis

supinator m.

Question 9

What nerve innervates serratus anterior m.?

Answer 9

long thoracic N.

Question 10

What nerve innervates the biceps brachii, coracobrachialis, and brachialis muscles?

Answer 10

musculocutaneous n.

Question 11

What muscles does the radial nerve innervate?

Answer 11

triceps brachii M
Anconeus M
brachioradioalis m
extensor carpi radialis longus m

Question 12

What are the superficial flexors of the forearm? (4)

Answer 12

Pronator teres M.
Flexor carpi Radialis M.
Palmaris Longus M.
Flexor Carpi Ulnaris M.

Question 13

what is the action deltoid M

Answer 13

flex/extend humerus
ABduct humerus
extend/laterally rotate humerus

insert at deltoid tuberosity of humerus

Question 14

what is the action supraspinatus M. ?

Answer 14

ABduct humerus (w/ deltoid)

insert @ greater tubercle of humerus

rotator cuff muscle

Question 15

What nerve innervates the medial part of the flexor digitorum profundus M.?

Answer 15

ulnar N.

= deep flexor

Question 16

What nerve innervates flexor carpi ulnaris M.?

Answer 16

ulnar N.

Question 17

What are the deep flexors of the forearm? (3)

Answer 17

flexor digitorum profundus m.
flexor pollicis longus m.
pronator quadratus M.

Question 18

What nerve innervates supraspinatus M.?

Answer 18

suprascapular N.

Question 19

Where does the long head of the biceps brachii

m originate?

Answer 19

supraglenoid tubercle of the scapula

Question 20

what is the action of subscapularis M ?

Answer 20

medially rotate & ADduct humerus

insert at Lesser tubercle of humerus

rotator cuff muscle

Question 21

what does teres minor m do?

Answer 21

laterally rotate humerus

insert @ greater tubercle of humerus

rotator cuff muscle

Question 22

What is in the triangular interval?

Answer 22

Radial N.

Deep Brachial A.

Question 23

Where does the short head of the biceps brachii m originate?

Answer 23

coracoid process of the scapula

Question 24

What muscles does the posterior interosseous nerve innervate? (7)

Answer 24

(extensors)
extensor digitorum m
extensor digiti minimi m
extensor carpi ulnaris
abductor pollicis longus
extensor pollicis brevis
extensor pollicis longus
extensor Indicis

double dipped cherries and peanuts preferably included

Question 25

What nerve innervates infraspinatus M.?

Answer 25

Suprascapular N.

Question 26

What nerve innervates pectoralis minor M.?

Answer 26

medial pectoral N.

Question 27

What are the hypothenar muscles?

Answer 27

One For All Opponens digiti minimi m. Flexor digiti minimi Brevis M. ABductor digiti minimi M.

Question 28

What is in the quadrangular space?

Answer 28

axillary N. | posterior humeral circumflex A.

Question 29

What nerve innervates teres minor M?

Answer 29

axillary N.

Question 30

What nerve innervates Teres major M?

Answer 30

lower subscapular N.

Question 31

Where does infraspinatus insert?

Answer 31

laterally rotate humerus insert at greater tubercle of humerus *rotator cuff muscle*

Question 32

What nerve innervates pronator teres m, flexor carpi radialis m, and palmaris longus m?

Answer 32

median N. = 3 of 4 superficial flexors of antebrachial muscles

Question 33

What are the rotator cuff muscles?

Answer 33

``` SITS: supraspinatus infraspinatus teres minor subscapularis ```

Question 34

what does teres major do

Answer 34

ADduct and medially rotate humerus insert at front of humerus

Question 35

What muscles does the deep ulnar nerve innervate?

Answer 35

All hypothenar muscles (OFA) Thenar ms: Deep head of flexor pollicis brevis ADductor pollicis m. 3rd and 4th lumbrical ms. dorsal and palmar interossei M.

Question 36

What is subscapularis M's action

Answer 36

ADducts humerus | medially rotates humerus

Question 37

What is the intermediate layer of flexors of the forearm?

Answer 37

Flexor digitorum superficialis M.

Question 38

what is the action of serratus anterior m?

Answer 38

protract scapula and stabilize against thoracic wall deep surface of medial border of the scapula

Question 39

What are the thenar muscles?

Answer 39

All For One And Abductor pollicis brevis M. Flexor pollicis brevis M. Opponens pollicis M. Adductor pollicis m.

Question 40

What nerve(s) innervate pectoralis major M.?

Answer 40

medial and lateral pectoral nerves

Question 41

What muscles does the anterior interosseous N. innervate?

Answer 41

pronator quadratus M. flexor pollicis longus M. lateral part of the flexor digitorum profundus m.

Question 42

What is the nerve that innervates the flexor digitorum superficialis M.?

Answer 42

Median N.

Question 43

What are the intermediate hand muscles?

Answer 43

1st and second lumbricals 3rd and 4th lumbricals dorsal interossei palmar interossei

Question 44

What nerve innervates the 1st and second lumbricals?

Answer 44

Medial nerve