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Chapter 3

PSB 3002 Chapter Notes - Chapter 3: Dura Mater, Pia Mater, Arachnoid Granulation

Course Code
PSB 3002
Bethany Stennett

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Chapter 3
a. Structure of the Nervous System-Basic Features of the Nervous System
Neuraxis: imaginary line drawn through the center of the CNS, from the bottom of the
spinal cord to the front of the forebrain
Anterior: toward the head
posterior: toward the tail
Rostral: in a direction along the neuraxis toward the front of the face
Caudal: away from the front of the face
Dorsal: top of the head or the back
Ventral: toward the bottom of the skull or the front surface of the body
The CNS consists of the brain and spinal cord
o Covered with meninges, dura mater, arachnoid membrane, and pia mater
o Under the arachnoid membrane is cerebrospinal fluid, which surrounds the brain
The PNS consists of the spinal and cranial nerves and peripheral ganglia
o Covered with dura mater and pia mater
o Choroid plexus of the lateral, third, and fourth ventricles produce cerebrospinal
o Cerebrospinal fluid flows from two lateral ventriclesthird ventriclethrough
cerebral aqueductfourth ventriclesubarachnoid spaceback into blood
supply through arachnoid granulations
o Hydrocephalus: enlargement of the ventricles and brain damage due to the flow
of cerebrospinal fluid being blocked by a tumor
b. Structure of the Nervous System-The Central Nervous System
The rai’s three ajor divisions:
o Forebrain
Surrounds the lateral and third ventricles
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