Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body.

Introduction to the Nervous System

Neu

ron

Multipolar neuron

Axon

Glial Cells

Nucleus

Nucleolus

Dendrite

Axon Hillock

Cell body

Schw

ann

cell/

Olig

oden

droc

yte

Figure 3.43- A longitudinal section of axons

Node of Ranvier

Schwann cellAxon

Cross section of a nerve

Cross section of a nerve 40XEpineurium

Perineurium

Endoneurium

Bundle ofaxons

Figure 3.41- Cross section of a nerve 400X

EpineuriumPerineurium

Endoneurium

Axon

Longitudinal section of unmyelinated nerve

Spinal cord cross section

Cross section of the spinal cord

PosteriorGray Horn

LateralGray Horn

AnteriorGray Horn

CentralCanal

Cross section of the spinal cord

PosteriorWhite

Column LateralWhite

Column

AnteriorWhite

Column

Gray Commisure

Motor neurons from the spinal cord

Neuroglialcells

Dendrite

Nucleus

Axon Terminal

Dendrite

Axon

Mitochondria

Myelin Sheeth

Nucleus

Schwann Cell

Cell Body

AxonMyelin Sheeth

Neuron M

odel with

Schwann cells

Figure 9.3: Structure of a myelinated neuron

Axolema (Axon cell membrane)

Nissel Bodies

Neurofibrils

Nucleus of the neuron

Nucleolus of the neuron