Presentation on theme: "Muscles of the Forearm Dr. Sama ul Haque. Objectives Identify the muscles in the anterior and posterior compartments of the forearm in terms of their."— Presentation transcript:
Muscles of the Forearm Dr. Sama ul Haque
Objectives Identify the muscles in the anterior and posterior compartments of the forearm in terms of their origin, insertion, nerve supply and actions. Know the neurovascular structures in the anterior and posterior compartments of the forearm. Discuss the functions of the muscles in the anterior and posterior compartment of the forearm.
Functional organization of Anterior and posterior Compartments of forearm.
Names of the Muscles of forearm Long names: good guide to location and function Location: ie. superficial / deep radial / ulnar Function: ie. flexor / extensor adductor / abductor Does it act on the thumb (pollux) or the fingers (digits)?
Functional Organization Anterior compartment – flexor / pronator Posterior Compartment – extensor / supinator Flex the wrist ………[flexor] Extend the wrist ……..[extensor] Pronate the forearm ……..[pronator] Acting on wrist (carpus) only ……[carpi] Acting on fingers ……..[digiti / digitorum] Acting on thumb (pollux) ……[pollicus]
Flexion / Extension at the wrist joint. Flexion Extension
Adduction / abduction at the wrist joint. AdductionAbduction
Movements of fingers. Metacarpophalangeal (condyloid joints): flexion / extension and abduction / adduction Interphalangeal (hinge joints): flexion / extension X X
Movements of the thumb – a specialized digit, occur at right angles to the fingers. Mainly at the Carpometacarpal (saddle) joint. MCP – condyloid; IP – hinge (like fingers).
Deep Posterior Compartment Abductor Pollicis Longus Extensor Pollicis Brevis Extensor Pollicis Longus Extensor Indicis Supinator Functional Organization: Extend Hand At Wrist Extend / Abduct Thumb Extend Index Finger Supinate
Deep Dissection Forearm (Posterior)
Superior and Inferior radioulnar Joints Superior radioulnar Joint: Head of radius articulates with radial notch of ulna Type: Pivot joint). It is held in place by the annular ligament. Radio-ulnar articulation is stabilized by interosseous membrane. Inferior radioulnar Joint:
Supination and Pronation
Course of radial and ulnar arteries in forearm
Neurovasculature (deep). Lateral: - radial artery - radial nerve Midline: - median nerve - anterior interosseus a. - anterior interosseus n. (deep branch of median) Medial: - ulnar artery (gives off common interosseus artery divides into anterior and posterior branches) - ulner nerve
Neurovasculature. Radial nerve and its branches supply all muscles in posterior compartment, including Brachioradialis (!). - superficial radial nerve - deep radial nerve - posterior interosseous nerve. Posterior interosseous artery runs between superficial and deep muscles
Radial & Ulnar Arteries medial lateral Ulnar artery Common interosseous Anterior Posterior Dorsal and palmer carpal branches Radial artery superficial (deep)palmar arches Deep (superficial) palmar arches Dorsal and palmer carpal branches
RELATION OF ARTERIES, NERVES AND TENDONS AT THE WRIST NANAN Superficial Radial Nerve Radial Artery Median Nerve Ulnar Artery Ulnar Nerve 1.Brachioradialis 2.Superficial Radial n. 3.Radial Artery 4.Flexor Carpi Radialis 5. Median Nerve 6.Flexor Digitorum Superficialis 7.Ulnar Artery 8.Ulnar Nerve 9. Flexor Carpi Ulnaris MOVING LATERAL TO MEDIAL 1-9 Thumb