Anatomy

Collections of axons in CNS

Collections of axons in PNS

Collections of neuron cell bodies in PNS

Collections of neuron cell bodies in CNS

Receives sensory fibers from spinal nerves

Contain the cell bodies of lower motor neurons

Contain autoomic motor neurons(only located in the thoracic and lumber segments)

Carry sensory information from the body toward the brain

Carry motor commands to the spinal cord

it contains cell bodies, dendrites and unmyelinated axons

It contains myelinated axons

Afferent=Sensory

Efferent=Motor

The outer most layer of connective tissue that surrounds the entire nerve

connective tissue layer surrounding nerve bundles(fascicles)

End of spinal cord between L1 and L2

doral and ventral nerve roots at the end of spinal cord(placement of epideral betweem L3 and L4 to prevent damage to spine)

delicate meningeal layer directly on spinal cord

Spider web looking meningeal layer

Tough mother, outer most layer of spinal cord and brain.

Contains the CSF(Cerebalspinal fluid)

Between Arachnoid mater and dura mater

between the dura mater and bone

• Approximately 2cm in diameter
• Greater in diameter at cervical and lumber regions where spinal nerves to the upper and lower extremities originate
• 31 pairs of nerves
• - 8 cervical
• -12 thoracic
• -5 lumbar
• -5 sacral
• -1 coccygeal