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PEDS100 Chapter Notes -Dorsal Root Ganglion, Anterior Ramus Of Spinal Nerve, Peripheral Nervous System

Physical Education and Sport
Course Code
Gail Amort- Larson

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Nervous System
Central nervous system: controls everything encased by bone
-Spinal Cord
Peripheral nervous system: everything outside of bone
-Cranial nerves(12 pairs) (has both sensory and motor neurons)
-Peripheral nerves (31 pairs) (has both sensory and motor neurons)
Peripheral Nervous System
Conveys impulses to and from brain and spinal cord
Sensory neurons : Afferent (convey impulses towards CNS)
Motor neurons: Efferent (convey impulses away from CNS)
Mixed neurons: Composed of sensory and motor neurons
Dermatomes: area of skin innervated by the sensory fibers of a single spinal
Cross section of Spinal Cord:
P: Posterior horn, dorsal rootlets connect here, sensory neurons travel through
A: Anterior horn, anterior rootlets connect here, motor neurons travel through
cell bodies found in dorsal root ganglia
Spinal nerve root: made up of sensory and motor fibers
Signal travels along sensory fibers, through dorsal root ganglia along posterior,
can either travel to Brain, or if a reflex travels out anterior route along motor fibers
motor fibers cause muscles to contract
Intervertebral disc between vertebrae
8 spinal nerve roots in neck (only 7 bones) nerve roots come out ABOVE
vertebrae (C1 spinal nerve root comes out above C1) space between C7 spinal
nerve root and T1 spinal nerve root is where C8 spinal nerve root comes out of
12 spinal nerve roots in thoracic region (12 bones) Spinal nerve roots come out
BELOW vertebrae (T1 spinal nerve root comes out below T1 vertebrae)
5 spinal nerve roots in lumbar (5 bones)
5 spinal nerve roots in sacral region (5 bones)
At least 1 spinal nerve root in coccyx region
Rami: spinal nerve splits into 2 branches after it leaves the vertebrae
-Dorsal Rami: innervates deep muscles
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