Flexor Compartment of Forearm

Proximal and Distal Attachment

Pronator Teres

P:

Ulnar Head: coronoid Process

Humeral Head: medial Epicondyle of Humerus

D: middle of lateral surface of radius

Proximal and Distal Attachment

Flexor Carpi Radialis

P: medial epicondyle of humerus

D: base of 2nd metacarpal

Proximal and Distal Attachment

Flexor Carpi Ulnaris

P:

Humeral Head: medial epicondyle of humerus

Ulnar Head: olecranon and posterior ulna

D: pisiform, hook of hamate and 5th metacarpal

Proximal and Distal Attachment

Palmaris Longus

P: medial epicondyle of humerus

D: flexor retinaculum and palmar aponeurosis

Proximal and Distal Attachment

Palmaris Brevis

P: medial border of palmar aponeurosis & skin on medial border of hand

D: skin over hypothenar eminence

Proximal and Distal Attachment

Flexor Digitorum Superficialis

P:

Humeroulnar Head: medial epicondyle of humerus

Radial Head: superior portion of anterior border of radius

D: shafts of middle phalanges digits 2-5

Proximal and Distal Attachment

Flexor Digitorum Profundus

P: proximal part of medial and anterior surfaces of ulna and interosseous membrane

D:

Medial Part: bases of distal phalanges of 4th and 5th digits

Lateral Part: bases of distal phalanges of 2nd and 3rd digits

Proximal and Distal Attachment

Flexor Pollicis Longus

P: anterior surface of radius and adjacent interosseous membrane

D: base of distal phalanx of thumb

Proximal and Distal Attachment

Pronator Quadratus

P: distal 1/4 of anterior surface of ulna

D: distal 1/4 of anterior surface of radius

Innervation

Pronator Teres

Peripheral: median nerve

Innervation

Flexor Carpi Radialis

Peripheral: median nerve

Innervation

Flexor Carpi Ulnaris

Peripheral: ulnar nerve

Innervation

Palmaris Longus

Peripheral: median nerve

Innervation

Palmaris Brevis

Peripheral: ulnar nerve

Innervation

Flexor Digitorum Superficialis

Peripheral: median nerve

Segmental: C7, C8, T1

Innervation

Flexor Digitorum Profundus

Peripheral:

Lateral half: median nerve (anterior interosseous)

Medial half: ulnar nerve

Segmental: C8, T1

Innervation

Flexor Pollicis Longus

Peripheral: median nerve (anterior interosseous)

Innervation

Pronator Quadratus

Peripheral: median nerve (anterior interosseous)

Action

Pronator Teres

pronates forearm and flexes elbow

Action

Flexor Carpi Radialis

wrist flexion and radial deviation

Action

Flexor Carpi Ulnaris

wrist flexion and ulnar deviation

Action

Palmaris Longus

wrist flexion and tenses palmar aponeurosis

Action

Palmaris Brevis

aids palmar grip by wrinkling skin of hypothenar eminence and deepens hollow of palm; protects and covers ulnar nerve and artery

Action

Flexor Digitorum Superficialis

flexion of MCP and PIP joints of digits 2-5; strongest at PIP joints

Action

Flexor Digitorum Profundus

flexion of MCP, PIP, and DIP joints of digits 2-5; only flexor at DIP joints

Action

Flexor Pollicis Longus

1st IP joint flexion

Action

Pronator Quadratus

pronates forearm; deep fibers bind radius and ulna together