October 24 - Ventricles & Meninges.docx

3 Pages
97 Views
Unlock Document

Department
Anatomy and Cell Biology
Course
Anatomy and Cell Biology 3319
Professor
guestlecture
Semester
Fall

Description
October 24, 2013 Ventricles & Meninges Pp. 381-383, 407-411 Ventricles of the Brain - Ventricles are expansions of the brain’s central cavity, filled with CSF and lined by epindymal cells - They are continuous with one another and the central canal of the spinal cord - Have paired lateral ventricles that lie in the cerebral hemispheres o Horseshoe shape - Third ventricle lies in the diencephalon o Anteriorly it connects to each lateral ventricle through an interventricular foramen - Fourth ventricle lies in the brain stem o Dorsal to the pons o Superior half of the medulla oblongata o Caudally connects to the central canal o 3 openings occur in the walls:  Paired lateral apertures in side walls  Median aperture in its roof  The holes connect the ventricles to subarachnoid space – allows CSF to fill both the ventricles and subarachnoid space Protection of the Brain - Continuation of meninges - CSF - Blood-brain barrier: protects brain from harmful substances in the blood Meninges - Dura mater surrounding the brain is a two-layered sheet of fibrous connective tissue o Periosteal layer: more superficial and attaches to the internal surface of the skull bones o Meningeal layer: deeper and forms the true external covering of the brain and is continuous with the dura mater surrounding the spinal cord o These 2 layers are fused together, except where they separate to enclose the blood-filled dural sinuses  These sinuses collect blood from the brain and conduct it to the large internal jugular veins of the neck  Largest dural sinus is the superior sagittal sinus in the superior midline - Arachnoid mater forms knoblike projections called arachnoid granulations/villi o These villi project superiorly through the dura mater into the superior sagittal sinus and into some other dural sinuses as well o The villi act as valves that allow CSF to pass from the subarachnoid space into the dural blood sinuses - Pia mater clings tightly to the brain surface, following the contours of the gyri, sulci, and fissures - In several places, the brain’s dura mater extends inward to form flat
More Less

Related notes for Anatomy and Cell Biology 3319

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit