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Scapula Bone – Introduction

Introduction to Scapula Bone Anatomy:

The scapula or shoulder blade is a flat, triangular-shaped bone that image descriptionlies adjacent to the posterior surface of ribs 2-7.

 

The posterior view of skeleton showing the left scapula and humerus
The posterior view of skeleton showing the left scapula and humerus and labeled right scapula
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Markings of the Scapula Bone:

  1. It has three borders (superior, lateral, medial), three angles (superior, lateral, medial) and two surfaces (costal, dorsal). A prominent ridge or spine divides the dorsal surface into two, unequal parts called the supraspinous fossa and infraspinous fossa.
  1. A shallow depression at the lateral angle called the glenoid cavity image descriptionaccepts the head of the humerus to form the shoulder or gleno-humeral joint.
The posterior view of skeleton showing the left scapula and humerus with right scapula
The posterior view of skeleton showing the left scapula, humerus, and right scapula with labeled right humerus
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  1. The scapula also image descriptionarticulates with the clavicle to form the shoulder girdle or pectoral girdle, which supports movements of the humerus.
View of the scapula and humerus on posterior view
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  1. Seventeen image descriptionmuscles attach to the borders, angles, ridges, bumps, processes, and fossae found on the surface of the scapula.
View of the scapula on posterior view
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  1. The muscles that insert on the scapula (intrinsic muscles) connect it to the axial skeleton. When these muscles contract, the scapula is elevated, depressed, rotated, protracted, retracted, or stabilized when the humerus is moved.
  1. The muscles that originate on the scapula (extrinsic muscles) insert on the humerus, radius, and ulna. They cause the humerus to rotate, abduct, adduct, flex or extend.

Test yourself:

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Test yourself on scapula with hidden answers
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