Nervous System

The brain and spinal cord

• central nervous system

• peripheral nervous system

• axon

• dendrites

transmitters that carry impulses from the skin and organs to the spinal cord and brain; afferent neurons

• sensory neurons

• astrocytes

• motor neurons

• efferent nerves

cells that make up nerve tissue

• neuron

• meninges

• CNS

• PNS

branches of a neuron that collect stimuli and transport them to a cell body

• dendrites

• axon

• neuron

• microglia

the fatty bands of insulation surrounding the axon fibers

• myelin sheath

• microglia

• dendrites

• astrocytes

glial cells that are positioned between neurons and capillaries to transmit nutrients and control the chemical environment

• astrocytes

• dendrites

• cell body

• sensory neurons

glial cells that absorb and dispose of dead cells and bacteria

• microglia

• efferent nerves

• meninges

• axon

units that form a protective covering around the spinal cord and central cavities within the brain

• ependymal

• astrocytes

• motor neurons

• myelin sheath

glial cells that wrap around nerve fibers and produce a fatty insulating material called myelin

• oligodendrocytes

• axon

• myelin

• dendrites

three protective membranes that surround the brain and spinal cord

• meninges

• dendrites

• white matter

• gray matter