Coracobrachialis Muscle

Coracobrachialis Muscle

Question 1. Enumerate the various anatomical events that occur at the level of insertion of the coracobrachialis.
Answer.

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The anatomical events occurring at the level of insertion of the coracobrachialis are:

• Circular shaft of humerus becomes triangular below this level.
• Deltoid and coracobrachialis are inserted at this level.
• Upper end of the origin of the brachialis extends up to this level.
• The brachial artery passes from the medial side of the arm to its anterior aspect.
• Basilic vein pierces the deep fascia at this level.
• Median nerve crosses in front of the brachial artery from the lateral to the medial side.

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• Radial nerve pierces the lateral intermuscular septum to pass from the posterior compartment of the arm to the anterior compartment of arm.
• Ulnar nerve pierces medial intermuscular septum to go from the anterior compartment of the arm to the posterior compartment of arm.
• Medial cutaneous nerves of arm and forearm pierce the deep fascia at this level.
• Nutrient artery pierces the humerus at this level.

Therefore, the site of insertion of the coracobrachialis is an important anatomical landmark in the arm.