Central Nervous System Study Guide

The CNS is protected by…

Bones, membranes, and fluids

Brain

The skull protects the..

Spinal Cord

The vertebral column protects the….

3 layers that protect both the brain and spinal cord

Membranes/Meninges are…

Dura Mater

The outer most of the meninges is the…

Dura Mater structure

Fibrous CT

Appears white due to collagen

Contains many blood vessels and nerves

Arachnoid Mater structure

Thin, resembles spiders web

Lacks blood vessels and nerves

Pia Mater Structure

Very thin

Many nerves and blood vessels

Subarachnoid space and Central Canal

Cerebrospinal fluid is found in…. (2 places)

Epidural space

Space outside of the dura mater and below the bone

Foramen Magnum

Spinal cord begins at the…

1st and 2nd lumbar vertebrae

The spinal cord ends at the…

31

The spinal cord contains __ segments

Pair, PNS

Each segment has a ____ of spinal nerves that branch out to parts of the body (___)

Gray matter

In a cross section of the spinal cord, the core contains…

White matter

Surrounding the unmeylinated core is…

Afferent/Sensory neurons

Gray matter

Axons

Posterior horn contains

Afferent/Sensory neurons

Axons

White matter

Dorsal root contains

Efferent/Motor Neurons

Gray matter

Cell bodies

Anterior horn contains

Efferent/motor neurons

Axons

White matter

Ventral root contains

Ascending tracts

Carry impulses to the brain

Myelinated

Sensory/Afferent neurons

Ascending tracts contains…

Descending tracts

Carry impulses away from the brain

Myelinated

Motor/Efferent neurons

Descending tracts contain

Lateral Horn

Between posterior and anterior horns

Anterior median fissure and posterior median sulcus

The two groves separating the spinal cord are…

Anterior Median Fissure

The deeper grove is…

Posterior Median Sulcus

The shallower grove is the….

Dorsal Root ganglion

Cell bodies of sensory/afferent neurons

Ventral roots

• Axons

• White matter

• Motor Neurons

Gray Matter

Cell bodies

Dendrites

Unmeylinated nerve fibers

Neuroglial cells

White matter

Axons

Myelinated fibers

Sensory/Afferent Neurons

Ascending

CNS+PNS

Unipolar

Efferent/Motor Neurons

Descending

CNS+PNS

Multipolar

Interneurons

Only CNS

Gray Matter

Multipolar

Dura Mater

1.

Arachnoid Mater

2.

3.

Dorsal Root

Pia Mater

4.

Ventral Root

5.

Body of Vertebra

6.

Epidural Space

7.

Subarachnoid space

8.

Spinal Nerve

9.

Dorsal Root Ganglion

10.

Spinal cord

11.

Epidural Space

12.

Arachnoid Mater

1.

Dura Mater

2.

Pia Mater

3.

Dorsal Root

4.

Spinal Nerve

5.

Ventral Root

6.

Subarachnoid space

7.

Spinal cord

8.

Epidural Space

9. + 12.

Bone of Vertebra

10.

Dorsal Root Ganglion

11.

White Matter

1.

Gray Matter

2.

Lateral Funiculus

3.

Dorsal Root of Spinal Nerve

4.

Dorsal Root Ganglion

5.

Posterior Horn

6.

Anterior Horn

7.

Ventral root of Spinal Nerve

8.

Anterior Median Fissure

9.

Posterior Funiculus

10.

Posterior median sulcus

11.

Gray Commissure

12.

Central canal

13.

Lateral horn

14.

Anterior funiculus

15.

Spinal nerve

16.