Ventral forearm and wrist muscles

Question 0

flexor carpi radialis

Answer 0

Origin: medial epicondyle of humerus
Insertion: base of 2nd (3rd) metacarpal
Innervation: median nerve (C6, C7)
Action: flexes and abducts hand at wrist

Question 1

pronator teres

Answer 1

Origin: ulnar head: coronoid process of ulna
humeral head: medial epicondyle of humerus
Insertion: middle of convexity of lateral surface of radius
Innervation: median nerve (C6, C7)
Action: pronates and flexes forearm

Question 2

palmaris longus (inconstant)

Answer 2

Origin: medial epicondyle of humerus
Insertion: distal 1/2 of flexor retinaculum; palmar aponeurosis
Innervation: median nerve (C7, C8)
Action: flexes hand (at wrist); tenses palmar aponeurosis

Question 3

flexor digitorum superficialis

Answer 3

Origin: humero-ulnar head: medial epicondyle of humerus and coronoid process of ulna
radial head: oblique line of radius
Insertion: shafts (bodies) of middle phalanges of medial 4 digits
Innervation: median nerve (C7, C8, T1)
Action: flexes wrist joint, flexes proximal interphalangeal of medial 4 digits; flexes proximal phalanges at metacarpophalangeal joints (stronger)

Question 4

flexor carpi ulnaris

Answer 4

Origin: humeral and ulnar head… olecranon and posterior border of ulna (via aponeurosis)
Insertion: pisiform, hook of hamate, 5th metacarpal
Innervation: ulnar nerve (C7, C8)
Action: flexes and adducts hand at wrist

Question 5

flexor pollicis longus

Answer 5

Origin: anterior surface of radius and adjacent interosseous membrane
Insertion: base of distal phalanx of thumb
Innervation: anterior interosseous nerve, from median nerve (C8, T1)
Action: flexes wrist; flexes metacarpophalangeal and interphalangeal joints of thumb

Question 6

flexor digitorum profundus

Answer 6

Origin: proximal 3/4s of medial and anterior surface of ulna and interosseous membrane
Insertion: bases of distal phalanges of 2nd - 5th digits
Innervation: lateral part: (digits 2&3; anterior interosseous branch) median nerve (C8, T1)
medial part: (digits 4&5) Ulnar nerve (C8, T1)
Action: flexes wrist joint; flexes distal interphalangeal joints of digits 2-5; assists with wrist flexion

Question 7

pronator quadratus

Answer 7

Origin: distal 1/4 of anterior surface of ulna
Insertion: distal 1/4 of anterior surface of radius
Innervation: anterior interosseous nerve, from median nerve (C8, T1)
Action: pronates forearm; deep fibers bind radius and ulna together