Card Set Information
nervous system vocab
Nucleus (nervous system)
collection of cell bodies in the CNS
a bundle of axons connecting nuclei (distant or neighboring)
interconnecting fiber tract systems
pia, arachnoid and dura maters
innermost meningeal layer, delicate and transparent
central meningeal layer
thick, tough, outer meningeal layer
contains CSF that pushes the arachnoid against the dura in life
space separating the dura and vertebral canal; contains fat, the roots of spinal nerves, and the internal vertebral plexus of veins
bundles of nerve fibers, their connective tissue coverings and blood vessels (vasa nervorum); may be either cranial (CN) or spinal
an axon, its neurolemma and its endoneurium
cell membranes of Schwann cells that surround the axon; these may be myelinated or unmyelinated
innermost of three connective tissue sheaths surrounding peripheral nerves
layer of dense connective tissue that encloses a fascicle, protecting it
thick connective tissue that encloses a bundle of fascicles and includes fatty tissues, blood vessels and lymphatics
Somatic Nervous System
Provides general sensory and motor innervaton to all parts of the body except smooth muscle, glands and the viscera in the body cavities.
collection of nerve cell bodies outside the CNS
Sensory relays in the CNS, from which the dorsal rootlets of the general sensory nerves (somatic) emerge.
(Cell bodies are located in the dorsal root ganglion.)
Cell bodies of motor neurons (somatic)
Dorsal root ganglion
Contains the cell bodies of sensory nerves (somatic)
Innervate the intrinsic (deep) back muscles and other posterior body wall tissues
*Do not* innervate extrinsic back muscles
NOT found in limbs.
Innervate the lateral and anterior body wall and the extremities.
They are the ONLY nerves to the extremities
tapering termination of spinal cord at L1
extension of the pia mater that stretches from the conus medullaris to the coccyx and anchors the spinal cord inferiorly
small, toothlike extension of the pia mater that anchors the spinal cord to the vertebral column laterally
internal vertebral plexus -- clinical significance
Helps facilitate venous return when necessary
Route for metastases from prostate to brain
penetrate the subarachnoid space below L1/L2
anesthesia in the epidural space blocks the roots; usually sacral
How many of each type of vertebrae are there?