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BIOB34H3 Lecture Notes - Arachnoid Mater, Dura Mater, Tentorium Cerebelli

Biological Sciences
Course Code
Ted Petit

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Chapter 13/14 The Brain and Cranial Nerves
Major Parts of the Brain
- Cerebrum
1. two cerebral hemispheres
- Diencephalon
1. thalamus
2. hypothalamus
3. epithalamus
- Brain stem
1. midbrain
2. pons
3. medulla oblongata
- Cerebellum
1. two cerebellar hemispheres
Protection and Coverings
- Cranial meninges
1. continuous with the spinal meninges, same basic parts
a. dura mater
1) tough outer layer
2) dense irregular CT
3) forms sac from foramen magnum to second sacral vertebra
b. arachnoid mater
1) middle layer
2) collagen and elastin fibers
3) subdural space is between dura mater and arachnoid mater, contains a little fluid
c. pia mater
1) inner layer
2) delicate CT covering spinal cord
3) subarachnoid space is between arachnoid mater and pia mater, contains
cerebrospinal fluid
4) extended thickened portions called denticulate ligaments fuse with arachnoid mater
and dura mater to hold cord in place
2. dura mater has 2 layers in cranial meninges
a. periosteal layer (outer)
1) periosteum of cranial bones
b. meningeal layer (inner)
1) corresponds to spinal dura mater
c. between layers are dural sinuses
d. extensions of dura mater separate parts of the brain
1) falx cerebri- between cerebral hemispheres
2) falx cerebelli- between cerebellar hemispheres
3) tentorium cerebelli- between cerebrum and cerebellum
- Cerebrospinal fluid (CSF)
1. similar to plasma
2. circulates through subarachnoid space
3. functions
a. cushions CNS
b. maintained at optimal chemical levels (ions, nutrients, etc.)
4. the ventricles are cavities within the brain that contain CSF
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