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Scapula
In anatomy, the '''scapula''', '''omo''', or '''shoulder blade''', is the bone that connects the humerus (arm bone) with the clavicle (collar bone).
The scapula forms the posterior part of the shoulder girdle. In humans, it is a flat bone, roughly triangle|triangular in shape, placed on a posterolateral aspect of the thoracic cage.
Structure
Surfaces
Costal
The '''costal or ventral surface''' 1 presents a broad concavity, the ''subscapular fossa''.
The medial two-thirds of this fossa are marked by several oblique ridges, which run lateralward and upward. The ridges give attachment to the tendinous insertions, and the surfaces between them to the fleshy fibers, of the Subscapularis. The lateral third of the fossa is smooth and covered by the fibers of this muscle.
Movements
Movements of the scapula are brought about by scapular muscles:
Elevation,
Depression,
Protraction,
Retraction,
Lateral rotation,
Medial rotation,
Upward Rotation,
Downward Rotation,
Anterior Tipping,
and
Posterior Tipping
Injury
Because of its sturdy structure and protected location, scapular fractures are uncommon; when they do occur, they are an indication that severe chest trauma has occurred.Additional images
Image:Pectoral girdle front diagram.svg|Pectoral girdle - front
Image:Human arm bones diagram.svg|Human arm bones diagram
Image:Shoulderjoint.PNG|Diagram of the human shoulder joint
Image:Gray205 left scapula lateral view.png|Left scapula. Lateral view.
Image:Gray521.png|The scapular and circumflex arteries.
References
External links
- - "Joints of the Upper Extremity: Scapula
Sources
Additions have been made from "Nickel; Schummer; Seiferle; Lehrbuch der Anatomie der Haussäugetiere.
See also
- Bone#Terminology|Bone terminology
- Scapulimancy/Oracle bone
- Terms for anatomical location
- Ossification of scapula
Category:Bones of the upper limb
Category:Flat bones
Category:Shoulder
Related Images
Sources: StartLearningNow, Wikipedia | Usage license: GNU FDL
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