GENERAL HISTOLOGY

Detailed explanation-1: -The deltoid has three functionally and anatomically distinct parts. The acromial part, sometimes also known as the middle or central, is the largest and the strongest. It is a multipennate muscle.

Detailed explanation-2: -Multipennate muscles involve multiple rows of muscle fibres whose central tendon branches into two or more tendons. The deltoid, the large muscle that lies over the shoulder joint, is an example of a multipennate muscle and can be broken down into the anterior deltoid, lateral deltoid, and posterior deltoid.

Detailed explanation-3: -Your deltoid muscles crown your shoulder, covering the front, side and back of the joint. They’re superficial, which means they’re close to the surface of your skin. The deltoid looks like an upside-down triangle. Tendons connect each of the three side to bones.

Detailed explanation-4: -In the middle part of the deltoid, muscle fibers are oblique between the bands or between the bands and the half-cones. This multipennate structure favors strength instead of range of excursion of the muscle.