The Neuron Dendrites Cell body (perikaryon, soma)

The NeuronDendritesCell body (perikaryon, soma)

Axon

Support cells (neuroglia)- more abundant than neurons- more mitotic capability

Axon hillock

Gaps between Schwann cells called nodes of Ranvier

axolemma

Myelinated axons: sheath of Schwann and myelin sheathone Schwann cell myelinates a single axonmultiple Schwann cells needed to cover entire length of an axon

Oligodendrocytes myelinate CNS axons (if myelinated)

Central Nervous System1. brain2. spinal cord

- ganglia associated

3. axons project to and from the body (CNS PNS)4. cell bodies in CNS except some in ganglia

Transmission1. innervation

- cell body as integrator2. action potentials (impulses)

- axon hillock3. myelin sheath

Synapses- presynaptic terminal- postsynaptic terminal- neurotransmitters- ligand-gated ions channels on postsynaptic membrane

Gap junction (nexus)- is an electrical synapse

Nervous System

Organization of neurons1. circuits for stimulus-response2. exchange of information

Neuron signaling1. afferent vs. efferent2. interneurons3. circuits

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Anencephaly



Anencephaly





Spina bifida occulta with meningocoele





Spina bifida with failure of neuropore closure



Cortical dysplasia

Cortical dysplasia



The Neuron Dendrites Cell body (perikaryon, soma)

Documents

axon slide

myelinated slide

soma slide

meningocoele slide

anencephaly slide

axon hillock slide

myelin sheath slide

postsynaptic membrane