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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.

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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:

1 Muscles of the Forearm Dr. Sama ul Haque

2 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.

3 Functional organization of Anterior and posterior Compartments of forearm.

4 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)?

5 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]

6 Flexion / Extension at the wrist joint. Flexion Extension

7 Adduction / abduction at the wrist joint. AdductionAbduction

8 Movements of fingers. Metacarpophalangeal (condyloid joints): flexion / extension and abduction / adduction Interphalangeal (hinge joints): flexion / extension X X

9 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).

10 Radius and Ulna

11 Radius and Ulna (Pronated)

12 Muscles of the anterior compartment of forearm

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14 Anterior Compartment of forearm Superficial: Common flexor origin  Pronator Teres  Flexor Carpi Radialis  Palmaris Longus  Flexor Digitorum Superficialis,  Flexor Carpi Ulnaris

15 Functional organization: Only flex at the wrist.  Flexor carpi radialis  Palmaris longus  Flexor carpi ulnaris Anterior Compartment of forearm

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17 Deep Dissection Forearm (Anterior)

18 Neurovasculature of Anterior Compartment of forearm

19 Muscles of the posterior compartment of forearm

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22 Muscles of Forearm

23 Anconeus Muscles of the Forearm (Post. View)

24 Posterior Forearm (Superficial dissection) Nerve Supply Radial Nerve Anatomical snuff box

25 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

26 Deep Dissection Forearm (Posterior)

27 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:

28 Supination and Pronation

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30 Course of radial and ulnar arteries in forearm

31 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

32 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

33 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

34 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

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