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The intermediate trunk coursed as the typical axillary artery and gave off the anterior circumflex humeral artery. The medial trunk gave off the lateral thoracic artery and was divided into the subscapular artery and the posterior circumflex humeral artery.
Life-threatening posterior circumflex humeral artery injury secondary to fracture-dislocation of the proximal humerus.
This common artery continues distally as the posterior circumflex humeral artery. The other 3 branches of axillary artery had a normal origin and the axillary artery itself followed a normal anatomical course in the upper limb as the brachial artery (picture 2).
CASE REPORT: We report a case of possible entrapment of Radial nerve and descending branch of posterior circumflex humeral artery due to abnormal fibromuscular tunnel between Brachialis and Brachioradialis on the left side in a middle aged male cadaver.
* The posterior circumflex humeral artery descends superficial to the axillary nerve and passed through the quadrangular space.

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