This ridge separates the teres major and minor muscles from the infraspinatus muscle. A ridge runs down the infraspinous fossa near the lateral border from the glenoid cavity to just above the inferior angle. Above the spine is the supraspinous fossa and below it is the infraspinous fossa. The dorsal surface divides into two unequal parts via the scapular spine which runs across from the posterior scapula before forming the acromion. Three ridges within this fossa allow for tendinous attachment. The ventral surface of the scapula abuts the thoracic rib cage and has a large concavity called the subscapular fossa where the subscapularis attaches. Muscle attachments to these landmarks are covered in the "Muscles" section. The spine and acromion serve as levers for the attached muscles, particularly the trapezius.The scapula is a site of attachment for many muscles and has several processes, projections, and surfaces for attachment. The scapula has three angles (superior/medial, lateral, inferior), three borders (medial, lateral/axillary, and superior), and two surfaces (ventral and dorsal). The scapula has three processes: the acromion, the spine, and the coracoid process. The deltoid tubercle of the scapular spine is the prominence indicating the medial point of attachment of the deltoid. The spine continues laterally as the flat, expanded acromion (Greek akros, point), which forms the subcutaneous point of the shoulder and articulates with the acromial end of the clavicle. The triangular body of the scapula is thin and translucent superior and inferior to the spine of the scapula although its borders, especially the lateral one, are somewhat thicker. The broad bony surfaces of the three fossae provide attachments for fleshy muscles. The concave costal surface of most of the scapula forms a large subscapular fossa. The convex posterior surface of the scapula is unevenly divided by a thick projecting ridge of bone, the spine of the scapula, into a small supraspinous fossa and a much larger infraspinous fossa. The scapula (shoulder blade) is a triangular flat bone that lies on the posterolateral aspect of the thorax, overlying the 2 nd-7 th ribs.
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