![]() ![]() The lateral border is the thickest border of the scapula and extends downwards from the glenoid cavity. It is divided by a ridge-like structure called the spine of the scapula, from which the deltoid and trapezius muscles originate.ĭorsal surface: Dorsal surface of the left scapula. The dorsal surface gives origin to the supraspinatus and infraspinatus muscles, and inferiorly to the teres minor and major. The serratus anterior originates from the costal surface, which also provides an attachment for the subscapularis muscle. The subscapular fossia for subscapularis, serratus, pector minor regions are highlighted. The scapula also articulates with the humerus of the upper arm to form the shoulder joint, or glenohumeral joint, at the glenoid cavity.ĭue to its flat nature, the scapula presents two surfaces and three borders the front-facing costal surface and the rear-facing dorsal surface, as well as the superior, lateral, and medial borders.Ĭostal surface: Costal surface of the left scapula. The scapula articulates with the clavicle through the acromion process, a large projection located superiorly on the scapula forming the acromioclavicular joint. The scapula, or shoulder blade, is a flat, triangular bone located to the posterior of the shoulder. glenoid: A shallow depression in a bone, especially in the scapula.acromion: The outermost point of the shoulder blade. ![]()
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