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Muscles of the Forearm Dr.Nivin Sharaf MD. Objectives -Describe the function of the muscles in the anterior and posterior compartment of the forearm.

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Presentation on theme: "Muscles of the Forearm Dr.Nivin Sharaf MD. Objectives -Describe the function of the muscles in the anterior and posterior compartment of the forearm."— Presentation transcript:

1 Muscles of the Forearm Dr.Nivin Sharaf MD

2 Objectives -Describe the function of the muscles in the anterior and posterior compartment of the forearm. -Name and identify the muscles in the anterior (flexor/pronator) and posterior (extensor/supinator) compartments of the forearm, noting their relations. -Name and identify the neurovascular structures in the anterior) and posterior compartments of the forearm, noting their relations.

3 Functional organization of Anterior and posterior forearm.

4 Names of the Muscles of forearm Many of them Long names: good guide to location and function Location: ie. superficial / deep radial / ulnar (which side is the thumb on??) 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. Ad-ductionAb-duction

8 Movements of fingers. MCP (condyloid jts):flexion / extension abduction / adduction IP (hinge jts):flexion / extension X X

9 Movements of the thumb – a specialized digit, occur at right angles to the fingers. Mainly at the CMC (saddle) jt. MCP – condyloid; IP – hinge (like fingers).

10 Muscles of Forearm

11 Anterior forearm: Flexor / pronator Compartment. Superficial: common flexor origin - pronator teres - flexor carpi radialis - palmaris longus - flexor digitorum superficialis, - flexor carpi ulnaris

12 Functional organization: Only flex at the wrist. - Flexor carpi radialis - Palmaris longus - Flexor carpi ulnaris

13 Muscles of the Forearm

14 Anterior Fore Arm Pass Fail Pass Fail

15 Ant Fore arm Wrist Flexors FCU+FCR FDS FDP PL Wrist Add FCU Wrist Abd FCR Nerve Supply

16 Post. Forearm Superficial disection Nerve Supply Radial Nerve Anatomical snuff box

17 Post. Forearm A: Extensor Digitorum B: Extensor Carpi Ulnaris C: Brachio Radialis D: Biceps Brachii E: Triceps F: Extensor Retinaculum

18 Anconeus Muscles of the Forearm Post View Origin :Lateral epicondyle of humerus Insertion Lateral surface of olecranon and superior part of posterior surface of ulna Action Assists triceps in extending forearm; stabilizes elbow joint; abducts ulna during pronation Innervation Radial nerve (C7, C8 and T1) Radial nerve innervates the BEST. Brachioradialis Extensors Supinator TricepsBrachioradialisExtensorsSupinatorTriceps

19 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

20 Deep Dissection Forearm Post Ant

21 Quiz 12. Pronator Teres 13. Flexor carpi radialis: 14. Flexor Digitorum: 15. Extensor carpi ulnaris: 16. Extensor digitorum: 17. Extensor carpi radialis:

22 Rotators of the Radius Supinator Pronators Biceps Brachii

23 Pronation / Supination: Occurs at radio-ulnar jts. Proximal: Head of radius articulates with radial notch of ulna (pivot jt). It is held in place by the annular ligament. Distal – Radius pivots around the fixed distal end of ulna (pivot jt). Radio-ulnar articulation is stabilized by interosseus membrane.

24 Common Extensor Origin Common Extensor Origin

25 Course of radial and ulnar arteries in forearm Axillary vein: continuation of basilic vein

26 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

27 Neurovasculature. Radial nerve and its branches supply all muscles in posterior compartment, including brachioradialis (!). - superficial radial nerve - deep radial nerve - posterior interosseus nerve. Posterior interosseus artery runs between superficial and deep muscles

28 Neurovasculature. Lateral:radial artery radial nerve Midline:median nerve [supplies all muscles except flexor carpi ulnaris and medial half of flexor digitorum profundous] Medial:ulnar artery ulnar nerve

29 Medial ½ of FDP FCU All hand muscles except 11/2 muscle groups(lateral 2 lumbricals and thenar muscles ) Ulnar Nerve

30 References Grey’s Anatomy Netter Keith Moore Recommended reading: Clinically Oriented Anatomy,6 th edition Keith Moore Pages:

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