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-- MatthewKlocek - 02 Oct 2007

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Upper Limb and Back: 2007 Answer Guide for Part III Short Answer 20 pts

Quadrangular Space 4pts

Medial
lateral aspect of the long head of the triceps
Lateral
surgical head of humerus (spiral groove)
Inferior
superior aspect of teres major
Superior
inferior aspect of teres minor (joint capsule)
Posterior
brachial fascia, tela subcutanea, skin
Anterior-superior
subscapularis

Contents
posterior humeral circumflex artery, axillary nerve, nerve to teres minor
Significance
communication between axilla and shoulder/arm fracture of the surgical neck, stretch injury during dislocation

Suboccipital Triangle 4pts

Posterior
Semispinalis Capitus
Posterior-lateral
Longissimus Capitus
Lateral
superior oblique
Medial-superior
rectus capitus posterior major (minor)
Anterior
atlanto-occipital membrane, posterior arch of atlas
Inferior
Inferior oblique

Contents
vertebral artery, dorsal ramus of 1st spinal nerve external vertebral venous plexus posterior

Significance: muscle actions on rotation and extension

Anatomical snuffbox 4pts

Floor
scaphoid bone Ulnar side: Tendon of extensor pollicus longus Radial side: Tendon of extensor pollicus brevis, tendon of abductor pollicus longus Roof: antebrachial fascia, tela subcutanea, skin distal and proximal borders: first dorsal interosseous, extensor carpi radialis longus

Contents: radial artery, superficial radial nerve, dorsal venous arch/cephalic vein (superficial) Significance: access to radial pulse, fracture of scaphoid bone

Triangular Interval 4pts

Lateral
medial aspect of lateral head of triceps
Medial
lateral aspect of long head of triceps
Superior
inferior aspect of teres major
Inferior
apex of long head and lateral head of triceps
Superior-anterior
subscapularis

Contents
porfunda brachii artery, radial nerve, ascending branch profunda brachii middle collateral artery,radial collateral artery

Significance: mid-humeral fracture

Ulnar Groove of the Humerus 4pts

groove of the humerus for ulnar nerve and related vessels. medial humeral epicondyle. ulnar nerve and superior ulnar collateral (arm) posterior ulnar recurrent (forearm) course together. ulnar nerve courses through flexor carpi ulnaris and heads of origin. related to medial collateral ligament of elbow. Significance: nerve entrapment, nerve compression, "funny bone".

Topic revision: r1 - 23 Oct 2007, UnknownUser
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