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Term
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Definition
from skin of body wall to spinal cord via: ventral or dorsal ramus --> spinal nerve --> dorsal root (part that enters spinal cord)
location of sensory cell bodies dorsal root ganglion |
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Term
| Summary of Somatic Nervous System Organization |
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Definition
Ventral roots: carry motor fibers only
Dorsal roots: carry sensory fibers only
Spinal nerves: carry both motor and sensory fibers
Venral rami: carry motor and sensory fibers
Dorsal rami: carry motor and sensory fibers (innervate a small region of skin and muscle along dorsal midline) |
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Term
Somatic NS: Brachial Plexus
Lumbosacral plexus |
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Definition
a network of ventral rami (motor and sensory) to upper extremity
network of ventral rami (motor + sensory) to lower extremity and perineum |
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Term
Somatic NS: Mytome
:Dermatome |
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Definition
mytome: a mass of muscle supplied by a single spinal nerve
dermatome: an area of skin supplied by a single spinal nerve |
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Term
Automonic Nervous System: 2 branches
and the 2 types of neurons |
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Definition
Sympathetic: fight or flight, innervates tissues in the body wall (eg. sweat glands, arrector pili muscles, peripheral blood vessels, etc.) as well as in the body cavities.
Parasympathetic: veg and relax, innervates tissues in the body cavities only
2 types of neurons: preganglionic cell body and fiber and postganlgionic cell body and fiber |
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Term
| Preganglionic Cell Bodies Locations in parasympathetic and sympathetic |
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Definition
Parasympathetic (craniosacral): brain or sacral segments of spinal cord
Sympathetic (thoracolumbar): lateral horn of thoracolumbar segments of spinal cord (T1-L2/L3)
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Term
| Postganglionic Cell Bodies Locations in parasympathetic and sympathetic |
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Definition
Parasympathetic: ganglia in the head or in the walls of organs
Sympathetic: prevertebral ganglia or paravertebral ganglia of the sympathetic trunk (chain) -- (ganlia run alongside spinal column) |
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Term
| Sympathetic ganglia continued... |
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Definition
prevertebral ganglia lie anterior to vertebral column and are associated with branches of aorta
paravertebral ganglia lie lateral to ventral column (a paravertebral ganglion is associated with each spinal nerve) -- in cervical only 3 ganglia are associated with 8 cervical spinal nerves
sympathetic trunks - linked to paravertebral ganglia
sympathetic trunks are tethered to ventral rami via white (entrance) and grey (exit) rami communications |
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Term
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Definition
sensory from organs (ischemia and stretch)
Single neuron
travel toward spinal cord alongside parasympathetic and sympathetic fibers
enter dorsal root |
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Term
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Definition
| describes the phenomenon of visceral (organ) pain being perceived as somatic (body wall) pain |
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