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Spinal Cord & PNS
- Passes information in between the brain and the periphery
Segments of the spinal cord from top to bottom
- Cervical
- Thoracic
- Lumbosacral and coccygeal
Peripheral Nervous System
- Roots
- Dorsal: sensory
- Ventral: motor
- Plexuses
- Cervical
- Brachial
- Lumbosacral
- Nerves descend through the lumbar cistern as the cauda equina and exit the spinal canal to form the lumbosacral plexus.
- Thoracic nerves
- Remain unmixed.
- Nerve transmissions pass across neuromuscular junctions to stimulate muscle.
- Peripheral nerve sensory receptors are present to detect sensory impulses from the periphery.