Lecture 2: CNS
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What makes up the CNS?
Brain and Spinal cord
Name the four areas of the Brain
- Cerebral Hemispheres with cerebral cortex (3.2-3.5lbs)
- Brain Stem
What make up the Diencephalon?
What makes up the Brain Stem?
- Medulla Oblongata
How is the brain protected?
- Blood Brain Barrier
- Cerebrospinal Fluid
Describe the Cranium
Formed by the skull bones
Describe the Meninges
- 3 tough membranes
- Dura Mater
- Arachnoid Mater
- Pia Mater
Desribe the Dura Mater
- It is the outer most layer of the meninges
- It is the strongest layer
- drains venous blood
Describe the Arachnoid mater
- The middle layer of the meninges
- Houses the subarachnoid space which contains CSF
Describe the Pia Mater
- It is the inner most meninge layer
- lines brain
- contains blood vessels
Describe the Blood Brain Barrier
- allows O2 and glucose to pass freely
- formed by a tight junction of astrocytes
- Regulates premiability
Describe Cerebrospinal Fluid (CSF)
- Protects the brain from chemical and physical injury
- Nourishes the brain
- Reduces the weight by 97%
- Formed in the choroid plexuses
Describe the Circulation of CSF
- It is formed in the ventricles
- Lateral horns ----> Third Ventricle---->Fourth Ventricle---->Central Canal------>subarachnoid space---->back to blood
Describe the ventricles
- Connected to one another and to the central canal of the spinal cord
- Lined by ependymal cells
- Contain CSF
- there ar 4 ventricles (2lateral , 3rd, 4th ventricle)
What do you call the ridges in the Cerebrum (Cerebral Hempispheres)
- Gyrus -Singular
What do you call the grooves in the Cerebrum?
- Slucus -Singluar
- Sulci - Plural
What do you call the deep grooves in the Cerebrum
How many lobes are there in the cerebrum?
Name the five lobes of the Cerebrum
What would you like to do?
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