Deep_Muscles_of_Flexor_Compartment_of_Forearm.pdf

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Deep Muscles of Flexor (Anterior) Compartment of Forearm

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1- Flexor digitorum profundus. 2- Flexor pollicis longus. 3- Pronator quadratus.

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Pronator teres Flexor carpi radialis Palmaris longus Flexor carpi ulnaris Flexor digitorum superficialis (cut) Flexor digitorum profundus Flexor pollicis longus Pronator quadratus Flexor retinaculum Lumbricals Deep muscles of forearm Lateral Medial

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Flexor digitorum profundus Flexor pollicis longus Pronator quadratus Origin of flexor digitorum profundus Ulnar aponeurosis Origin of pronator quadratus Origin of flexor pollicis longus m. Insertion of pronator quadratus m. Interosseous membrane

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Flexor Digitorum Profundus

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Interosseous membrane Flexor digitorum profundus from upper ¾ of anterior and medial surfaces of ulna (main origin) Flexor retinaculum Ulnar aponeurosis

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Common synovial sheath (ulnar bursa) Flexor retinaculum Synovial sheath Fibrous flexor sheath

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Tendons of flexor digitorum profundus Tendons of flexor digitorum superficialis Lumbricals

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Action of flexor digitorum profundus • Flexes all joints of the medial four fingers. • Flexes the wrist. Nerve supply -Medial ½ from ulnar nerve. -Lateral ½ from anterior interosseous nerve (branch from median)

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Flexor Pollicis Longus

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Interosseous membrane Flexor retinaculum Flexor pollicis longus Tendon of flexor pollicis longus Upper 2/3 of anterior surface of radius Insertion to palmar aspect of distal phalanx of thumb

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Tendon of flexor carpi radialis Flexor retinaculum Tendon of flexor pollicis longus Tendons of flexor digitorum superficialis Tendons of flexor digitorum profundus

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Action of flexor pollicis longus • Flexes all joints of the thumb. • Assists in flexion of the wrist. Nerve supply -Anterior interosseous nerve (branch from median)

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Pronator Quadratus Muscle

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Pronator Quadratus M. Origin: from oblique ridge on the lower ¼ of anterior surface of the shaft of ulna Insertion: into lower ¼ of anterior and medial surfaces of radius

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Pronator quadratus m.

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Action of pronator quadratus Pronation of forearm on radioulnar joints. Nerve supply -Anterior interosseous nerve (branch from median)