Scapular spine

The spine of the scapula or scapular spine is a prominent plate of bone, which crosses obliquely the medial four-fifths of the scapula at its upper part, and separates the supra- from the infraspinatous fossa.Left scapula. Animation. Root of spine is shown in red.Position of root of spine (shown in red.) Animation.Medial view of left scapula. Root of spine shown in red.Posterior surface of scapula. Root of spine is not labeled. But visible at center right.Left scapula. Posterior view. Root of spine shown in red.Posterior view. Root of spine shown in red.Left scapula seen from behind (spine shown in red).Position of spine (shown in red). Animation.Left scapula seen from behind (spine labeled at center top, projecting 'out').Left scapula seen from behind (spine labeled at center top).Left scapula. lateral view (spine labeled at upper right).Left scapula. Lateral view (spine shown in red)Surface anatomy of backSpine of scapula labeled in red, showing muscles attached to itTrapezius muscleDeltoid muscle The spine of the scapula or scapular spine is a prominent plate of bone, which crosses obliquely the medial four-fifths of the scapula at its upper part, and separates the supra- from the infraspinatous fossa. It begins at the vertical border by a smooth, triangular area over which the tendon of insertion of the lower part of the Trapezius glides, and, gradually becoming more elevated, ends in the acromion, which overhangs the shoulder-joint.