Editing Scalp (section)

===Blood supply===
The blood supply of the scalp is via five pairs of arteries, three from the [[external carotid]] and two from the [[internal carotid]]:
* internal carotid
** the [[supratrochlear artery]] to the midline forehead. The supratrochlear artery is a branch of the ophthalmic branch of the internal carotid artery.
** the [[supraorbital artery]] to the lateral forehead and scalp as far up as the vertex. The supraorbital artery is a branch of the ophthalmic branch of the internal carotid artery.
* external carotid
** the [[superficial temporal artery]] gives off frontal and parietal branches to supply much of the scalp
** the [[occipital artery]] which runs posteriorly to supply much of the posterior aspect of the scalp
** the [[posterior auricular artery]], a branch of the external carotid artery, ascends behind the auricle to supply the scalp above and behind the auricle.
Because the walls of the blood vessels are firmly attached to the fibrous tissue of the superficial fascial layer, cut ends of vessels here do not readily retract; even a small scalp wound may bleed profusely.

'''Venous drainage'''
The veins of the scalp accompany the arteries and thus have similar names, e.g. Supratrochlear and supraorbital veins, which unite at the medial angle of the eye, and form the angular vein, which further continues as the facial vein.

The superficial temporal vein descends in front of the tragus, enters the parotid gland, and then joins the maxillary vein to form the retromandibular vein. The anterior part of it unites with the facial vein to form the common facial vein, which drains into jugular vein, and ultimately to the subclavian vein. The occipital vein terminates to the sub-occipital plexus.

There are other veins, like the emissary vein and frontal diploic vein, which also contribute to the venous drainage.