Organisation of the Nervous System

CNS and PNS

CNS and Somatic

PNS and Somatic

Somatic and Sensory

are responsible for sending and receiving nerve impulses or signals

carry messages from organs to the brain

provide support and nutrition in the nervous system

maintain homeostasis

synaptic terminals

axons

cell body

myelin sheath

yes

no

astrocytes

microglial cells

ependymal cells

oligodendrocytes

defend, engulf anything that should not be there

line cavities

myelinate and protect

support and regulate ions

satellite cells

schwann cells

astrocytes

microglial

ependymal

oligodendrocytes

transmit impulses from sensory receptors toward the CNS

impulse moves from CNS to rest of the body

impulse moves between sensory and motor neurons within the CNS

transmit impulses from the sensory receptors toward the CNS

impulse moves from the CNS to the rest of the body

impulse moves between sensory and motor neurons within the CNS

transmit impulses from sensory receptors toward the CNS

impulse moves from the CNS to the rest of the body

impulse moves between sensory and motor neurons within the CNS