| 12 | number of cranial nerves |
| Cranial Foramen | where cranial nerves leave the cranial cavity |
| Intervertebral Foramen | where spinal nerves leave the vertebral cavity |
| 31 | number of spinal nerve pairs |
| Ventral Root | where motor neurons leave the spinal cord |
| Dorsal Root | where sensory neurons leave the spinal cord |
| Dorsal Root Ganglia | where sensory neurons cell soma are located |
| Ventral Horn | where motor neuron cell soma are located |
| Endoneurium | connective tissue that surrounds individual axons |
| Perineurium | connective tissue that surrounds groups of axons |
| Fascicles | a group of axons formed by the perineurium |
| Epineurium | connective tissue that surrounds the entire nerve |
| Myelin Sheath | layer of insulation surrounding an axon |
| Schwann Cells | cells that form the myelin sheath in the PNS |
| Mixed Nerve | takes info to and from the CNS |
| Sensory Nerve | only takes info to the CNS |
| Motor Nerve | only takes info away from the CNS |
