3 Questions
What is the shape of the scapula bone?
The scapula is a triangular bone.
What is attached to the upper part of the dorsal surface of the scapula?
A triangular spine projects back and extends laterally as a curved plate of bone, the acromion.
How many digitations of subscapularis are attached from the superior angle of the scapula to the base of the spine?
The first two digitations are attached from the superior angle down to the base of the spine.
Study Notes
- The scapula is a triangular bone that is thick at the lateral angle and projects upwards into the bent coracoid process.
- The lateral border is thick down to the inferior angle.
- The rest of the blade is composed of thin, translucent bone.
- From the upper part of the dorsal surface, a triangular spine projects back and extends laterally as a curved plate of bone, the acromion, over the shoulder joint.
- The costal surface is concave and marked by three or four ridges that converge from the medial border towards the lateral angle.
- These give attachment to fibrous septa from which the multipennate fibres of subscapularis arise.
- The muscle is attached to the medial two-thirds of the costal surface and the lateral third is bare and separated from the overlying muscle by the subscapularis bursa.
- The first two digitations are attached from the superior angle down to the base of the spine.
- The next two digitations are thinned out from this level down to the inferior angle, while the last four digitations converge to a roughened area on the costal surface of the inferior angle.
Test your knowledge of the anatomy and structure of the scapula bone with this quiz. Explore details about the shape, borders, surfaces, and muscle attachments of the scapula.
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