Acromion

Acromion

[uh-kroh-mee-uhn]
The acromion process, or simply the acromion (from Greek: akros, "highest", ōmos, "shoulder"), is an anatomical feature on the scapula, together with the coracoid process extending laterally over the shoulder joint.

In humans

It is a continuation of the scapular spine, and hooks over anteriorly.

The acromion articulates with the clavicle to form the acromioclavicular joint.

The acromion forms the summit of the shoulder, and is a large, somewhat triangular or oblong process, flattened from behind forward, projecting at first lateralward, and then curving forward and upward, so as to overhang the glenoid cavity.

Surfaces

  • Its superior surface, directed upward, backward, and lateralward, is convex, rough, and gives attachment to some fibers of the Deltoideus, and in the rest of its extent is subcutaneous.
  • Its inferior surface is smooth and concave.

Borders

  • Its lateral border is thick and irregular, and presents three or four tubercles for the tendinous origins of the Deltoideus.
  • Its medial border, shorter than the lateral, is concave, gives attachment to a portion of the Trapezius, and presents about its center a small, oval surface for articulation with the acromial end of the clavicle.

In animals

The acromion process of bats (Mammalia: Chiroptera) is particularly elongated compared to that of humans.

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