Summary
Summary in depth description of head and neck blood supply
- Course
- Institution
in depth description of head and neck blood supply
[Show more]
Seller
Follow
alkurdyahmed1
Content preview
The veins of the brain drain into the intracranial dural venous sinuses, which eventually drains into the internaljugular veins of the neck. The characteristic features of the venous drainage of the brain are as follows:
1. The venous return in the brain does not follow the arterial pattern.
2. The veins of the brain are extremely thin walled due to absence of muscular tissue in their walls.
3. The veins of the brain possess no valves.
4. The veins of the brain run mainly in the subarachnoid space.
The veins of the brain comprise cerebral veins, cerebellar veins, and veins of the brainstem.
Cerebral veins
The cerebral veins are divided into external (superficial) and internal cerebral veins, which drain the external
surfaces and the internal regions of the cerebral hemisphere, respectively.
The external cerebral veins
The external cerebral veins drain the surface (cortex) of the hemisphere and are divided into three groups, viz.
1. Superior cerebral veins
2. Middle cerebral veins
3. Inferior cerebral veins
, Superior cerebral veins: The superior cerebral veins are about 8–12 and drain the upper parts of the
superolateral and medial surfaces of the cerebral hemisphere. They ascend upwards, pierce the arachnoid
mater, and traverse the subdural space to enter the superior sagittal sinus. The anterior veins open at right
angle, while the posterior open obliquely against the flow of bloodstream in the superior sagittal sinus,
thereby preventing their collapse by increased CSF pressure.
Middle cerebral veins: The middle cerebral veins are four, two on each side: superficial middle cerebral vein
and deep middle cerebral vein. The superficial middle cerebral vein lies superficially in the lateral sulcus.
Anteriorly, it runs forwards to drain into the cavernous sinus while posteriorly, it communicates with the
superior sagittal sinus via superior
Inferior cerebral veins: The inferior cerebral veins are many in number but smaller in size. They drain the
inferior surface and lower parts of medial and superolateral surfaces of the cerebral hemisphere into nearby
intracranial dural venous sinuses, e.g., transverse sinus.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller alkurdyahmed1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $22.10. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now