2 ObjectivesIdentify 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 functionLocation: ie. superficial / deepradial / ulnarFunction: ie. flexor / extensoradductor / abductorDoes it act on the thumb (pollux) or the fingers (digits)?
5 Functional Organization Anterior compartment – flexor / pronatorPosterior Compartment – extensor / supinatorFlex 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]
15 Functional organization: Only flex at the wrist. Flexor carpi radialis Anterior Compartment of forearmFunctional organization:Only flex at the wrist.Flexor carpi radialisPalmaris longusFlexor carpi ulnarisFlexor Carpi RadialisPalmaris LongusFlexor Carpi ulnaris
27 Superior and Inferior radioulnar Joints Superior radioulnar Joint:Head of radius articulates with radial notch of ulnaType: Pivot joint).It is held in place by the annular ligament.Radio-ulnar articulation is stabilized by interosseousmembrane.Inferior radioulnar Joint:
31 Neurovasculature (deep). Lateral: radial artery radial nerve Midline: median nerveanterior interosseus a.anterior interosseus n.(deep branch of median)Medial:ulnar artery(gives off common interosseus artery divides into anterior and posterior branches)ulner nerveradial nulnar aradial a.ulnar nmedian nanterior interosseus a + n
32 Radial nerve and its branches supply Neurovasculature.Radial nerve and its branches supplyall muscles in posterior compartment, including Brachioradialis (!).- superficial radial nerve- deep radial nerve- posterior interosseous nerve.Posterior interosseous artery runs between superficial and deep musclesBrachioradialisDeep branchposterior interosseus branchSuperficial branch