Acromialis

Acromialis is a term used in anatomy to describe a muscle or a part of a muscle that is associated with the acromion, a bony projection of the scapula (shoulder blade) that forms the highest point of the shoulder. The acromion serves as an attachment point for several muscles and ligaments that contribute to the stability and movement of the shoulder joint.

The term acromialis can refer to a small muscle, known as the acromialis muscle, which is present in some individuals. This muscle is a variant of the deltoid muscle and originates from the acromion, inserting into the deltoid tuberosity of the humerus. Its function is to assist in the abduction of the arm, although its presence is not consistent across all individuals.

Additionally, the term acromialis can refer to a part of another muscle, such as the acromial part of the deltoid muscle. The deltoid muscle is a large, triangular muscle that covers the shoulder joint and is primarily responsible for the abduction, flexion, and rotation of the arm. The acromial part of the deltoid muscle originates from the lateral border of the acromion and contributes to the overall function of the deltoid muscle.

In summary, the term acromialis is used to describe either a small, variable muscle or a part of a larger muscle that originates from the acromion and plays a role in the movement and stability of the shoulder joint.