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50 Cards in this Set

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Sacral Plexus
contains the ventral rami from spinal nerves L4-S3
Superior gluteal nerve
Plexus: sacral
Nerves: L4-S1
Innervates:
Inferior gluteal nerve
Plexus: sacral
Nerves: L5-S2
Innervates: Maximus gluteus
Tibial nerve
Plexus: Sacral, from sciatic nerve
Spinal nerves; L4-S3
Innervates:
Sacral Plexus nerves
Superior/Inferior gluteal, Sciatic, Common Peroneal, Tibial, Superficial/deep peroneal nerve
Femoral Nerve
Plexus: Lumbar
Spinal nerves: L2-L4
Innervates: Flexors of the hip (Iliapsoas) and anterior thigh
Obturator Nerve
Plexus: Lumbar
Spinal nerves: L2-L4
Innervates: Medial thigh (passes through obturator foramen)
Sciatic nerve
Plexus: sacral
Nerves: L4-S3
Innervates: the whole lower extremity! Splits into Tibial, Common Peroneal
Common Peroneal Nerve
Plexus: Saccral, from Sciatic nerve
Nerves: L4-S2
Innervates Hamstringsshort head of biceps femoris
Number of spinal nerve pairs
31
Cervical nerves
8
Thoracic nerves
12
lumbar nerves
5
saccral nerves
5
coxxygeal nerves
1
Lumbar plexus
Spinal nerves: T12, L1-L4
Nerve plexus
a complex interwoven network of converged adjacent spinal nerves that blend to produce compound nerve trunks.
lumbosacral plexus
The plexuses originating from the ventral ramii of the lumbar and saccral regions of the spine.
lumbar plexus
T12-L4; Nerves from here: femoral, obturator, both from L2-L4
3 types of nerves based on number of axons and dendrites
Multipolar, Bipolar, Unipolar
One axon, multiple dendrites (seen on motor cells, many interneurons
multipolar
one axon, one dendrite (special sensory cells)
bipolar
one process acts both as a dendrite and axon (sensory cells)
unipolar
Supportive cells of the nervous system
Glial cells
Astrocytes, oligodendrocytes, microglia, ependymal cells
Glial cells of the CNS
Schwann Cells, satellite cells
Glial cells of the PNS
repair brain or nerve system
Astrocytes
Produce myelin for the CNS
oligodendrocytes
The garbage men of the CNS; they phagocytize debris within it
Microglia
These line the inner CNS cavities
ependymal cells
produce myelin in the PNS
Schwann cells
A collection of neuronal cell bodies within the CNS
Nucleus
A collection of neuronal cell bodies within the PNS
Ganglion
A bundle of axons within the CNS
Nerve Tract
A bundle of axons in the PNS
Nerve
Conveys nerve impulses toward the brain
Afferent
Conveys nerve impulses away from the brain
Efferent
White matter, gray matter, dorsal root, dorsal root ganglion, ventral root, spinal nerve, dorsal ramus, ventral ramus
8 key components in a spinal cord segment
composed of nerve cell processes; has an insulating coat of a fatty substance called myelin
white matter
composed of nerve cell bodies; does not have myelin coating
gray matter
sensory nerve processes bringing information into the spinal cord
dorsal root
CNS
Brain and Spinal Cord
PNS
Cranial and Peripheral nerves
Neuron components (6)
Cell body, axon, dendrite, synapse, myelin, nodes of ranvier
conveys stimulus away from the cell body
axon
conveys stimulus toward the cell body
dendrite
junction between axon and dendrite or cell body
synapse
insulating fat, speeds velocity of conduction on nerves
myelin
space between myelin sheaths on a nerve
nodes of ranvier
Spinal Nerves: how many, what kinds
31 total pairs
8 cervical
12 thoracic
5 lumbar
5 saccral
1 coxxygeal