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1

characteristics of the dura mater

most outer covering
dense connective tissue
vascular
in the cranium forms the dural venous sinuses
innervated

2

characteristics of the arachnoid mater

Loose connective tissue
lined back to back by simple squamous epithelium
avascular
projects into the sinus to drain CSF into the blood stream

3

Characteristics of the pia mater

vascular loose connective tissue
Lies directly on the brain and spinal cord
interacts with ependymal cells to form choroid plexus

4

what kind of cells are found in the anterior gray horn?

alpha motor neurons cell bodies

5

posterior grey horn?

central segment of sensory neurons

6

lateral gray horn?

the cell bodies of visceral neurons

7

grey commissure?

gray matter around a central canal

8

What does the central canal contain?

CSF

9

what do alpha motor neurons look like?

they are large cells with pale staining of large nuclei

have abundant nissl bodies

embedded in neuropil

10

What is the neuropil?

meshwork of tissue in gray matter excluding the cell bodies

Comprised of- dendritic and axonal processes, and central glial cells

11

What are the six layers of the cerebrum?

1. the molecular layer

2. external granular layer

3. external pyramidal cell layer

4. internal granular layer

5. ganglionic layer (internal pyramidal cells)

6. multiform cell layer (polymorphic)

12

What are the three layers of the cerebellum?

1. molecular layer (stellate and basket cells)

2. purkinje cell layer (single layer of motor neurons)

3. granular layer (granule cells and type II golgi cells)

13

What do granule cells do?

They carry excitatory signals to the cerebellum

14

What is the choroid plexus?

Invaginated folds of pia mater containing tufts of fenestrated capillaries covered by simple cuboidal ependymal cell in ventricles of the brain

15

What makes up the BBB?

1. continuous capillaries with tight junctions

2. the foot processes of astrocytes (surround the capillaries and neurons

3. neuronal processes (mostly astrocytes)

16

what the epineurium?

outer most tissue of a peripheral nerve

typically dense CT
carry blood to the nerves

17

what is the perineurium?

surrounds the bundles of nerve fibers

cells joined by tight junction
has contractile properties

18

What is the endoneurium?

associated with individual nerve fibers

Consists of thin layer of reticular fibers produced by the Schwann cells