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Introduction to the Nervous System

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Page 1: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Introduction to the Nervous System

Page 2: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Neu

ron

Page 3: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Multipolar neuron

Axon

Glial Cells

Nucleus

Nucleolus

Dendrite

Axon Hillock

Cell body

Page 4: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Schw

ann

cell/

Olig

oden

droc

yte

Page 5: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Figure 3.43- A longitudinal section of axons

Node of Ranvier

Schwann cellAxon

Page 6: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Cross section of a nerve

Page 7: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Cross section of a nerve 40XEpineurium

Perineurium

Endoneurium

Bundle ofaxons

Page 8: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Figure 3.41- Cross section of a nerve 400X

EpineuriumPerineurium

Endoneurium

Axon

Page 9: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Longitudinal section of unmyelinated nerve

Page 10: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Spinal cord cross section

Page 11: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Cross section of the spinal cord

PosteriorGray Horn

LateralGray Horn

AnteriorGray Horn

CentralCanal

Page 12: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Cross section of the spinal cord

PosteriorWhite

Column LateralWhite

Column

AnteriorWhite

Column

Gray Commisure

Page 13: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Motor neurons from the spinal cord

Neuroglialcells

Dendrite

Nucleus

Page 14: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Axon Terminal

Dendrite

Axon

Mitochondria

Myelin Sheeth

Nucleus

Schwann Cell

Cell Body

AxonMyelin Sheeth

Neuron M

odel with

Schwann cells

Page 15: Introduction to the Nervous System. Neuron Multipolar neuron Axon Glial Cells Nucleus Nucleolus Dendrite Axon Hillock Cell body

Figure 9.3: Structure of a myelinated neuron

Axolema (Axon cell membrane)

Nissel Bodies

Neurofibrils

Nucleus of the neuron

Nucleolus of the neuron


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