Upper Extremity Forearm Musculature & Vasculature, Cubital Fossa, Hand Osteology and Ligaments

Presentation  Elbow Biomechanics

Objectives  Describe the gross anatomy for each system (circulatory, muscular, nervous, and skeletal) in the upper extremity.  Integrate the systems to discuss the upper extremity stability and mobility functions.  Analyze common injuries in the upper extremities.  For each muscle, describe how the attachment sites result in an action around a joint.  For each muscle, identify the innervation (peripheral nerve and nerve roots).

Cubital Fossa

Forearm Musculature  Anterior Compartment  Flexors and pronators  3 layers: superficial, intermediate, deep  Posterior Compartment  Extensors and supinators  2 layers: superficial and deep

 Median nerve  All flexors/pronators EXCEPT  FCU and ½ FDP  Courses midline down forearm between FDS and FDP  Ulnar nerve  FCU and ½ FDP  Courses medially between FCU and FDP  Radial nerve  Superficial lateral extensors (BR, ECRL)  Courses between BR and ECRL  Deep branch and Posterior interosseous nerve  All other extensors/supinators  Courses deep, branches extensively

Clinical Relevance  Muscle testing FDS and FDP  Elbow tendinitis (lateral epicondylitis)  Synovial cyst

Clinical Relevance  Mallet or Baseball finger  Boutonniere Deformity  Swan Neck Deformity