A unique unreported anomalous muscle of scapular region and its clinical implications - A case report.

Back ground: It is a well documented fact that the lower border of spine of scapula gives origin to deltoid muscle only. We report a case of anomalous muscle arising from the medial aspect of lower border of spine of scapula in the left upper extremity of a 59 year old male cadaver. The anomalous muscle is innervated by axillary nerve which also gave a motor twig to the long head of triceps brachii. This variation was unilateral. The morphological, embryological and clinical significance of the anomalous muscle is discussed.