Blood supply of head and neck Flashcards
How do you know the difference between the internal and external carotid artery
Internal gives no branches to the neck and enters skull through carotid canal
Name the branches of the external carotid artery
Superior thyroid, lingual, facial, maxillary, superficial temporal, posterior auricular, occipital and ascending pharyngeal
Describe route of vertebral arteries
Subclavian artery -> foramen transversarium in C6-> C1 -> vertebral canal -> foramen magnum -> basilar artery
Describe route of internal carotid artery once it enters skull
Enters skull through carotid canal
Passes anteriorly through cavernous sinus in the carotid sulcus on side of sphenoid body
Anterior to the clinoid process it gives off opthalmic artery and then anterior and middle cerebral arteries
How does blood get from brain venous sinuses to the external carotid artery?
Via emissary veins
What is the crista galli?
Where the flax cerebri attaches anteriorly to the skull, ethmoid bone ridge
Where is the superior saggital sinus found?
Between the two layers of falx cerebri, deep to the skull cap
What are the venous lacunae?
Lateral extensions of the sinus
What does the inferior saggital sinus turn into when it meets the free margin of the tentorium cerebelli?
Joins great cerebral vein to form straight sinus
Where are the cavernous sinuses found?
Middle cranial fossa, either side of the body of the sphenoid and pituitary gland.
What passes through the cavernous sinus?
Internal carotid artery, abducent nerve, oculomotor, trochlear and maxillary branches of trigeminal
Describe the passage of blood through the cavernous sinus
Opthalmic veins-> cavernous sinus-> superior and inferior petrosal sinuses-> transverse sinus&internal jugular vein respectively
Where is the confluence of sinuses?
Posteriorly, underneath occipital bone
