Anterior Forearm

Question 1

How many muscles are there in the anterior forearm?

Answer 1

8
superficial = 4
intermediate = 1
deep = 3

Question 2

what is the main action of the anterior compartment?

Answer 2

flexion at wrists and fingers

pronation

Question 3

where is the common flexor origin?

Answer 3

medial epicondyle of the humerus

Question 4

where does the flexor carpi ulnaris attach?

Answer 4

common flexor origin + additional head from ulna.

pisiform bone

Question 5

what is the action and innervation of the flexor carpi ulnaris?

Answer 5

flexion and adduction at wrist

ulnar nerve

Question 6

where does palmaris longus attach?

Answer 6

common flexor origin

flexor retinaculum

Question 7

what is the function of the flexor retinaculum?

Answer 7

prevents “bowstringing” - holds the tendons down.

Question 8

what is the action and innervation of palmaris longus?

Answer 8

flexion at wrist

median nerve

Question 9

where does the flexor carpi radialis attach?

Answer 9

common flexor origin

bases of metacarpals II and III

Question 10

what is the action and innervation of flexor carpi radialis?

Answer 10

flexion and abduction at wrist

median nerve

Question 11

what border of the cubital fossa does the pronator teres contribute to?

Answer 11

medial border

Question 12

where does the pronator teres attach?

Answer 12

common flexor origin

mid-shaft of radius

Question 13

what is the action and innervation of pronator teres?

Answer 13

pronation of forearm

median nerve

Question 14

name the 4 superficial muscles of the anterior compartment of the forearm

Answer 14

flexor carpi ulnaris, flexor carpi radialis, palmaris longus, pronator teres

Question 15

name the muscle that lies in the intermediate layer of the anterior compartment of the forearm

Answer 15

flexor digitorum superficialis

Question 16

which two important structures pass between the 2 heads of the flexor digitorum superficialis?

Answer 16

median nerve and ulnar artery

Question 17

where does the flexor digitorum superficialis attach?

Answer 17

one head from common flexor origin, and one from radius

middle phalanges of the 4 fingers

Question 18

what is the action and innervation of flexor digitorum superficialis?

Answer 18

flexes at MCP and proximal IP joints of the 4 fingers
flexes at wrist
median nerve

Question 19

name the 3 muscles in the deep layer of the anterior compartment of the forearm?

Answer 19

flexor digitorum profundus, flexor pollicis longus, pronator quadratus

Question 20

what are the attachments of flexor digitorum profundus?

Answer 20

ulna + interosseous membrane

distal phalanges of the 4 fingers

Question 21

what is the action of flexor digitorum profundus?

Answer 21

only muscle to flex distal IP joints

also flexes at MCP joints and wrist

Question 22

what is the innervation of flexor digitorum profundus?

Answer 22

medial two fingers = ulnar nerve

lateral two fingers = median nerve

Question 23

what are the attachments of flexor pollicis longus?

Answer 23

radius

distal phalanx of thumb

Question 24

what is the action and innervation of flexor pollicis longus?

Answer 24

flexes IP + MCP joints of thumb

median nerve

Question 25

what are the attachments of pronator quadratus?

Answer 25

ulna to radius

Question 26

what is the action and innervation of pronator quadratus?

Answer 26

pronates forearm

median nerve

Question 27

which 2 nerves supply the anterior compartment of the forearm?

Answer 27

median and ulnar