The posterior compartment of the arm refers to the anatomical region situated at the back part of the upper limb between the shoulder and elbow joints. It is composed of various structures including muscles, tendons, blood vessels, nerves, and connective tissues.
Muscles in the posterior compartment of the arm primarily participate in the movements of extension and adduction. The major muscles found in this compartment are the triceps brachii, an extensor muscle involved in straightening the arm, and the anconeus, a small muscle that assists in elbow extension.
Tendons, which are fibrous connective tissues, connect muscles to bones, enabling movement. The triceps brachii tendon attached to the olecranon process of the ulna bone is a prominent structure in the posterior compartment of the arm.
Blood vessels, such as the profunda brachii artery and the radial nerve, pass through the posterior compartment to supply the arm with oxygen and nutrients essential for its proper functioning.
Nerves in the posterior compartment of the arm include the radial nerve, which provides sensory innervation to the arm and controls the extensor muscles. This nerve is vital for functions like wrist extension, forearm extension, and elbow extension.
Overall, the posterior compartment of the arm plays a crucial role in the movement and functionality of the upper limb.
