14 terms

Spinal Nerves and Plexuses

Exercise #21
Cervical Nerves: C1-C8
Thoracic Nerves: T1-T12
Lumbar Nerves: L1-L5
Sacral Nerves: S1-S4
Coccygeal Nerve
the lowest pair of spinal nerves
Meissner corpuscles
Touch receptors in skin. Discriminative
Pacinian corpuscles
pressure receptors. Discriminative
changed or adjusted to be suitable. I.e cannot feel toes when not thinking about them.
Dorsal root
sensory (afferent) fibers entering the grey matter of the spinal cord
collection of nerve cell bodies in the peripheral nervous system
Ventral root
motor (efferent) fibers exiting the gray matter of the spinal cord
pseudounipolar neuron
neuron with continuous dendrite and axon, with cell body off to one side
Non encapsulated receptors
Free nerve endings, pain and temperature nerves have this (non discriminative)
Lower motor neurons
located in PNS, cell bodies are located in spinal cord and their nerve fibers extend to and make direct contact with muscles