VH Dissector: Head & Neck: Ventricles & Meninges

Ventricles of the Brain

Begin with the Brain

STEP 1

Remove the Left hemispheres of the cerebrum and cerebellum

STEP 2

Highlight the lateral ventricles

STEP 3

Highlight the third ventricle

STEP 4

Highlight the fourth ventricle

STEP 5

Remove the Right hemispheres of the cerebrum and cerebellum.

STEP 6

Remove the Vermis of the Cerebellum

STEP 7

Remove the Medulla oblongata (Myelencephalon)

STEP 8

Remove the Pons

STEP 9

Remove the Midbrain (Mesencephalon)

STEP 10

Remove the Left and Right Thalamus

STEP 11

Remove the Anterior Commissure.

STEP 12

Remove the Corpus Callosum

STEP 13

The ventricles are connected. However, the connections between the ventricles are not visualized in this cadaver

Cerebrospinal fluid (CSF) flows through and around the brain. Cerebrospinal fluid is produced by the choroid plexes found in the lateral ventricles of both hemispheres of the brain.

The CSF flows through the Foramen of Monro in each hemisphere, which drains the CSF into the third ventricle. The Aquiduct of Sylvius takes the cerebrospinal fluid to the forth ventricle and subsequently into the sub-arachnoind space that surrounds both the brain and the spinal cord.

The connections from the fourth ventricle to the sub-arachnoid space are called the Foramen of Magendie and Luschka. The arachnoind granulations re-absorb the cerebrospinal fluid back into the blood stream.

Meninges

Begin with the spinal cord

STEP 14

Add the spinal dura mater

STEP 15

View the cervical cross section.

STEP 16

Using the Highlight tool, can you identify the location of the cervical cross section?

Now view the T12-L1 cross sections

STEP 18

Using the Highlight tool, can you identify the meningeal layers in the T12-L1 cross sections?

STEP 19

Using the Highlight tool, can you find the conus medularis and the cauda equina in this view?

STEP 20

Describe the flow of the cerebral spinal fluid from the brain down throuigh the vertebral column.

STEP 21

Credits:

VH Dissector steps modified for Drexel Dissector by Dr. Haviva Goldman from original website activity created by Jeffrey Fahl, MD, Kyle Petersen, PhD, Richard Drake, PhD, Alesha Petitt, MA, Claira Ralston, MS and Kim Price, MA and modified by Jeffrey Fahl, MD, Michael Smith, PhD, Albany Medical College.

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