Types of Neurons

Sensory neurons

-carry impulses from the peripheral parts of the body to the CNS.

Interneurons

-located entirely within the CNS and synapse with other neurons.

Motor neurons carry ...

impulses from the CNS to effectors, to produce an action.

Schwann Cells

- occur only in the peripheral nervous system.

-they form the myelin sheath around axons.

micoglial cells

-are scattered throughout CNS.

-keep the tissues clean by englufing and digesting cellular debris and bacteria.

oligodendrocyte cell

-type of neuroglial cell that supports nerurons and forms myelin around some nerve fibers within the CNS.

astrocyte cell

-primary supporting cells for nuerons in the brain.

-stimulate growth of neurons

-influence synaptic transmission

ependymal cell

form an epithelial-like lining of cavities in the brain and spinal cord. produces CSF.

dendrites

bring signal into the cell body

axon

A threadlike extension of a neuron that carries nerve impulses away from the cell body.

myelin

a fatty substance that helps insulate neurons and speeds the transmission of nerve impulses

soma

cell body

A node of Ranvier

Gaps in myelin sheath to facilitate rapid impulse

axon terminal

the end of an axon

afferent neurons

Nerve cells that carry impulses towards the central nervous system

efferent neurons

neurons that take information from the brain to the rest of the body

unipolar neuron

a neuron with one process extending from its cell body

bipolar neurons

A neuron that has only two projections (one axon/one dendrite) from the cell body

multi polar neuron have

many dendrites, one axon,

Multipolar neuron are the ...

most common neuron type

synapse

A junction where information is transmitted from one neuron to the next.

Type of cells in the nervous system

Neurons and glial cells

glial cells

support cells found in the nervous system

Neuron

a specialized cell transmitting nerve impulses; a nerve cell.

afferent means the same as ...

sensory

efferent means the same as ...

motor

Unipolar neurons

not found in humans

the nucleus

the structure D is the...