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 |