PATHOLOGY

Detailed explanation-1: -The posterior auricular vein assists with the draining of the muscles and skin of the scalp. It originates from small vessels behind the ear superficial to the temporal fascia and anastomoses with the occipital vein superiorly.

Detailed explanation-2: -It originates from a plexus around the external occipital protuberance and superior nuchal line to the back part of the vertex of the skull. It usually drains into the internal jugular vein, but may also drain into the posterior auricular vein (which joins the external jugular vein). It drains part of the scalp.

Detailed explanation-3: -The scalp drains into superficial and deep venous systems. The superficial veins follow their respective arteries. The supraorbital and supratrochlear veins drain the superficial scalp anteriorly. While the superficial temporal, occipital, posterior auricular drain the superficial scalp posteriorly.

Detailed explanation-4: -The occipital artery and vein supply blood flow and drainage, and the occipital lymph nodes and vessels drain lymph. The posterior auricular nerve innervates it; the facial nerve innervates the remainder of the occipitofrontalis.