[Plate 141, Arteries of Posterior Cranial Fossa]Venous Drainage
Dural venous sinuses
Drain venous blood from superficial and deep veins of the brain
Sinuses drain to internal jugular vein via jugular foramen
Veins on superior and lateral surfaces of brain drain to superior sagittal sinus
Basal veins run laterally and dorsally around cerebral peduncle to end in great vein of Galen, which drains to straight sinus
Veins on posterior and inferior surfaces of brain, superior cerebellar veins, and transverse sinuses drain to several sinuses
Straight
Transverse
Superior petrosalVascular Supply to Scalp, Face, and Neck
Arterial Supply
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Common carotid artery
Branch of aortic arch on left
Branch of brachiocephalic artery on right
Ascends neck in carotid sheath, beneath anterior border sternocleidomastoid
Bifurcates into internal and external carotid arteries at level thyroid cartilage
Internal carotid artery has no branches in the neck
External carotid artery
Begins in upper border thyroid cartilage
Mainly supplies the face and structures external to the skull, with some branches to the neck
Branches
Ascending pharyngeal
a. Ascends on pharynx
b. Send branches to pharynx, prevertebral muscles, middle ear, and cranial meninges
Superior thyroid
a. Supplies thyroid gland, infrahyoid muscles, and sternocleidomastoid muscle