Muscles Of The Anterior Compartment Of Forearm

Question 0

What muscles make up the intermediate (second) layer of the anterior forearm?

Answer 0

Flexor digitorum superficial

Question 1

What muscles make up the superficial (first) layer of the anterior forearm?

Answer 1

Pronator teres, flexor carpi radialis, palmaris longus, and flexor carpi ulnaris

Question 2

What muscles make up the deep (third) layer of the anterior forearm?

Answer 2

Flexor digitorum profundus, flexor pollicis longus, and pronator quadratus

Question 3

Origin of pronator teres

Answer 3

Ulnar head: coroniod process of ulna

Humeral head: medial epicondyle of humerus

Question 4

Insertion of pronator teres

Answer 4

Middle of convexity of lateral surface of radius

Question 5

Innervation of pronator teres

Answer 5

Median nerve (c6 and c7)

Question 6

Actions of pronator teres

Answer 6

Pronates and flexes forearm

Question 7

Origin of flexor carpi radialis

Answer 7

Medial epicondyle of humerus

Question 8

Insertion of flexor carpi radialis

Answer 8

Base of 2nd (3rd) metacarpal

Question 9

Innervation of flexor carpi radialis

Answer 9

Median nerve (c6 and c7)

Question 10

Action of flexor carpi radialis

Answer 10

Flexes and abducts hand at wrist

Question 11

Origin of palmaris longus

Answer 11

Medial epicondyle of humerus

Question 12

Insertion of palmaris longus

Answer 12

Distal half of flexor retinaculum, palmar aponeurosis

Question 13

Innervation of palmaris longus

Answer 13

Median nerve (c7 and c8)

Question 14

Actions of palmaris longus

Answer 14

Flexes hand (at wrist) and tenses palmar aponeurosis

Question 15

Origin of flexor carpi ulnaris (humeral head and ulnar head)

Answer 15

Olecranon and posterior border of ulna (via aponeurosis)

Question 16

Insertion of flexor carpi ulnaris (humeral head and ulnar head)

Answer 16

Pisiform, hook of hamate, 5th metacarpal

Question 17

Innervation of flexor carpi ulnaris (humeral head and ulnar head)

Answer 17

Ulnar nerve (c7 and c8)

Question 18

Actions of flexor carpi ulnaris (humeral head and ulnar head)

Answer 18

Flexes and adducts hand at wrist

Question 19

Origin of flexor digitorum superficialis

Answer 19

Humeroulnar head: medial epicondyle of humerus and coronoid process of ulna
Radial head: oblique line of radius

Question 20

Insertion of flexor digitorum superficialis

Answer 20

shafts of middle phalanges of medial four digits

Question 21

innervation of flexor digitorum superficialis

Answer 21

median nerve (c7, c8, t1)

Question 22

actions of flexor digitorum superficialis

Answer 22

flexes wrist joint
flexes proximal interphalangeal joints of middle four digits, acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints

Question 23

origin of flexor digitorum profundus

Answer 23

proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane

Question 24

insertion of flexor digitorum profundus

Answer 24

bases of distal phalanges of 2nd, 3rd, 4th, and 5th digits

Question 25

innervation of flexor digitorum profundus

Answer 25

lateral part (to digits 2 and 3): median nerve (c8 and t1) (anterior interosseous membrane)
medial part (to digits 4 and 5): ulnar nerve (c8 and t1)

Question 26

action of flexor digitorum profundus

Answer 26

flexes wrist
flexes distal interphalangeal joints of digits 2, 3,4, and 5
assists with wrist flexion

Question 27

origin of flexor pollicis longus

Answer 27

anterior surface of radius and adjacent interosseous membrane

Question 28

insertion of flexor pollicis longus

Answer 28

base of distal phalanx of thumb

Question 29

innervation of flexor pollicis longus

Answer 29

anterior interosseous nerve, from median nerve (c8 and t1)

Question 30

actions of flexor pollicis longus

Answer 30

flexes wrist

flexes metacarpophalangeal and interphalangeal joints of thumb

Question 31

origin of pronator quadratus

Answer 31

distal quarter of anterior surface of ulna

Question 32

insertion of pronator quadratus

Answer 32

distal quarter of anterior surface of radius

Question 33

innervation of pronator quadratus

Answer 33

anterior interosseous nerve, from median nerve (c8 and t1)

Question 34

actions of pronator quadratus

Answer 34

pronates forearm

deep fibers bind radius and ulna together