Triangle of auscultation Latissimus dorsi Trapezius Rhomboid Nearby ribs 6-7 Lumbar triangle External oblique of abdomen Iliac crest Above internal oblique of abdomen Weakness “lumbar hernia”

 . The humeromuscular tunnel  It is formed by three heads of triceps brachii and the sulcus for radial nerve of humerus.  It extends downwards from the medial to the lateral side of the back of middle part of the humerus;  It transmits the radial nerve and the deep brachial vessels.

Triangular space Subscapularis Teres major Long head Circumflex scapular a. Quadrangular space Humeral surgical neck axillary nerve and posterior humeral circumflex a.

Extensor carpi radialis longus Extensor digitorum Extensor digiti inimi Extensor carpi ulnaris Deep Supinator Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis Anatomical snuff-box: Tendons of these three muscle radial a and cephalic v. scaphoid bone

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