Upper ExtremityForearm 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