The acromion is a prominent, bony process that forms a part of the scapula, commonly known as the shoulder blade. It is an essential component of the pectoral girdle, contributing to the structure and mobility of the shoulder joint.
Anatomical Description
The acromion projects from the spine of the scapula. The spine itself is an elevated ridge found on the dorsal (back) surface of the scapula bone. This spine is notable for dividing the dorsal surface of the scapula into two unequal parts. The acromion is the lateral (outer) end of this spine.
Here's a breakdown of its key anatomical features:
- Location: Situated at the superior (upper) and lateral aspect of the scapula.
- Nature: A bony projection, specifically a process, indicating an outward growth from a bone.
- Relationship to Scapular Spine: It is a direct continuation and the most lateral point of the spine of the scapula.
Role in the Shoulder
While the question specifically asks "What is acromion?", understanding its context helps clarify its significance. As part of the scapula, the acromion plays a crucial role in forming the shoulder joint. It articulates with the clavicle (collarbone) to form the acromioclavicular (AC) joint, which is vital for the arm's range of motion and stability.
Key Characteristics of the Acromion
To summarize the definitive aspects of the acromion:
| Feature | Description |
|---|---|
| Bone Type | Bony process |
| Parent Bone | Scapula (Shoulder Blade) |
| Associated Structure | Spine of the Scapula |
| Body System | Skeletal System (Pectoral Girdle) |
| Function (General) | Forms part of the shoulder girdle, supports articulation with the clavicle. |
Practical Insights
Understanding the acromion is particularly relevant in fields like anatomy, orthopedics, and physical therapy. Injuries to the shoulder often involve this structure, such as AC joint separations or fractures of the acromion itself. Its prominent position makes it easily palpable (able to be felt) on the outer aspect of the shoulder, serving as a key anatomical landmark for healthcare professionals.
For further information on human anatomy, you can consult reputable sources like medical encyclopedias or university anatomy departments.
