Anterior Compartment of Forearm - Deep Layer

Question 1

flexor digitorum profundus

Answer 1

PA:
+ proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane

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

N:
+ lateral part (digits 2-3): median nerve (C8, T1), anterior interosseous branch
+ medial part: (digits 4-5): ulnar nerve (C8, T1)

A:
+ flexes wrist joint, carpometacarpal joints
+ flexes distal interphalangeal joints of digits 2-5
+ assists with wrist flexion

Question 2

flexor pollicis longus

Answer 2

PA:
+ anterior surface of radius and adjacent interosseous membrane

DA:
+ base of distal phalanx of thumb

N:
+ anterior interosseous nerve, from median nerve (C8*, T1)

A:
+ flexes wrist joint, carpometacarpal joints
+ flexes metacarpophalangeal and interphalangeal joints of thumb

Question 3

pronator quadratus

Answer 3

PA:
+ distal quarter of anterior surface of ulna

DA:
+ distal quarter of anterior surface of radius

N:
none?

A:
+ pronates forearm
+ deep fibers bind radius and ulna together