The subscapularis is an extensive triangular muscle which fills the subscapular fossa and additions into the lesser tubercle of the humerus and the front of the container of the shoulder-joint.
Structure
It emerges from its average 66% and from the lower 66% of the section on the axillary outskirt (subscapular fossa) of the scapula.
A few strands emerge from tendinous laminae, which converge the muscle and are appended to edges on the bone; others from an aponeurosis, which isolates the muscle from the teres major and the long leader of the triceps brachii.
The strands pass horizontally and mix into a ligament that is embedded into the lesser tubercle of the humerus and the foremost piece of the shoulder-joint case. Tendinous filaments stretch out to the more prominent tubercle with additions into the bicipital notch.
Relations
The ligament of the muscle is isolated from the neck of the scapula by an extensive bursa, which speaks with the pit of the shoulder-joint through a gap in the case. The subscapularis is isolated from the serratus foremost by the subscapularis (supraserratus) bursa.
Nerve supply
The subscapularis is provided by the upper and lower subscapular nerves, parts of the back rope of the brachial plexus. (C5-C6)
Capacity
The subscapularis turns the leader of the humerus medially (inward pivot) and adducts it; when the arm is raised, it draws the humerus forward and descending. It is an incredible guard to the front of the shoulder-joint, forestalling relocation of the leader of the humerus.
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