spinal cord organization Flashcards
spinal cord
encased in part of the central portion of the CNS
-42 to 45 cm long
what is the spinal cord involved in …
sensory processing, motor outflow, and reflexes
central nervous system
brain and spinal cord
peripheral nervous system
cranial nerves, spinal nerves and autonomic nerves
within individual vertebrae’s gray matter is in the _______ and white matter is ______________
center ; around the gray
dorsal root
nerve fiber coming off the dorsal side
dorsal root ganglia
where the dorsal root fibers sit
dorsal median septum
goes down between both sides of the dorsal side
dorsal intermediate septum
between the medium septum and the end of the dorsal side
ventral root
nerve fibers coming off the ventral side
spinal nerve
combined of both dorsal and ventral root nerve
lateral column
side where white matter is
ventral column
white matter at the ventral side
ventral median fissure
within the ventral side of the white matter that separates it into half
anterior/ventral white commissure
where white matter can cross over from side to side
lissauer’s tract
axons coming in on the dorsal/lateral side
intermediate zone
between the dorsal and ventral horns
laminae of rexed
gray matter
-dorsal horn is lamina 1 through 6
-intermediate zone is lamina 7
-ventral horn is lamina 8 through 9
-lamina 10 surrounds central canal
fasciculus gracilis
bundles of axons coming in from legs
-leg information coming up from all receptors
fasciculus cuneatus
bundles of axons coming from upper extremities
-arm information coming in from receptors
dorsal (posterior) spinocerebellar tract
tract on dorsal side from spinal cord to the cerbellum
ventral (anterior) spinocerebellar tract
tract on the ventral side from spinal cord to cerebellum
lateral corticospinal tract
descending and motor
-cortex to spinal cord
rubrospinal tract
“red nucleus” within brainstem
-brainstem to spinal tract
lateral spinothalamic tract
ascending from spinal cord to thalamus
-pain and temperature tract
dorsal is the same as _______
posterior
ventral is the same as ______
anterior
dorsal/posterior horns
-substantia gelatinosa (what caps the posterior horn and stains pale)
-the body is composed of interneurons and projection neurons
ventral/anterior horns
contains cell bodies of the large motor neurons that innervate skeletal muscles
-alpha motor cell bodies
what is the motor pathway within the spinal cord
lateral ventrospinal tract
-run’s on ventral side and carrying information that will synapse here and send signals out, it goes everywhere to all levels of the spinal cord
ventral is ________, dorsal is __________
motor ; sensory
