Organization of Spinal Cord Flashcards
where is cervical enlargement located
C5-T1
where is lumbosacral enlargement
L2-S3
filum terminale
continuation of spinal cord from L2 - S2/3
where do dura and pia mater attach
S2-3
where do you do a lumba rpunction
L3/L4
where does cervical spinal n 8 exit
below cervical vertebra C7
spinal nerve
dorsal + ventral root
what does gray matter contain
neuron cell bodies
what is white matter arranged into
tracts, fasciculi, or commissures
what are tracts, fasciculi or commissures
collection of myelinated axons with similar functions and similar origin and termination
commissures
tracts/fasciculi that cross from side of the spinal cord to the other
whre is most of the white matter
cerival region
where is most gray matter
cervical adn lumbar enlargements
what are the 3 main regions of gray matter
dorsal
ventral
lateral horns
what are the 3 main lamina of gray matter
substantia gelatinosa, nucleus proprius, motor nuclie
what are teh 3 mian columns of gray matter
intermediolateral cell colum
clark’s column
sacral parasympathetic nuclus
dorsal horn function
sensory input
what does dorsal horn contain
central processes of pseudounipolar neurons whose cell body is in dorsal root ganglia
function of ventral horn
motor output
what does ventral horn contain
cell bodies of motor neurons whose axons innervate skeletal muscle
function of lateral horn
preganglionic sympahtics
what does lateral horn contain
preganglionic sympathetic cell bodies
function of interneurons
synapse with motor neuron cell bodies in ventral horn
lateral motor aons innervate what
limbs
medial motor axons innervate what
axial skeleton
tract cells
give off processes
anterior exons
extensors
posterior ansons
flexons
substantia gelatinosa (II) function
modulate nociception
nucleus proprius (IV, V, VI)
synapse of cell bodies of second order neurons of spinothalamic tract
motor nuclei (IX)
motor neurons whose axons innervate skeletal muscle
where is nucleus dorsalis (clarke’s column) located
C8-L3
what is in clarke’s colum
cell bodies of dorsal spinocerebellar tract
where is lateral horn located
T1-L2(30
WHAT DOES LATERAL HORN CONTAIN
PREGANGLIONIC CELL BODIES OF SYMPATHETIC NEURONS
WHERE IS SACRAL PARASYMPATHIETC NUCLEUS LOCATED
s2-4
what does sacral parasympathetic nucleius contain
preganglionic parasympathetic neuron cell bodies
what are teh 3 major columns of the spinal cord
dorsal lateral and bentral funiculus
function of dorsal funiculus
proproception, virbratory sense, crude touch
what is the dorsal funiculus arranged itno
fasciculus cuneatus, facsiculus graclisis
where is fasciculus cuneatus located
C1-T6
what does fasciculus cuneatus get input from
upper trunk and upper limb
where is fasciculus gracilis located
all spinal cord levels
where does fasciuclus gracilis get input from
lower trunk and lower limb
where does fasciuclus gracilis get input from
lower trunk and lower limb
where is lateral funiculus prominante
cerbial levels
where does alteral funiculus originate and terminate
o-cortex
t- spinal cord
function of lateral funiculus
motor
ventral spinocerebellar tract
ascneding tract
o - spinal cord
t- cerebellum
functino of ventral spinocerebellar tract
sensory info from extremies to cerebellum for position
dorsal spinocerebellar tract
ascending tract
o - spinal cord
t- cerebellum
function of dorsal spinocerebellar tract
position sense
spinothalamic tract
ascending tract
o - spinal cord
t-thalamus
function of spinothalamic tact
pain, temp, touch
what does spinothalamic tract arise from
nucleus propiuse
what does spinothalamic tract ascend into
ventrolateral funiculus
anterior corticospinal tract
descending
function of anterior corticospinal tract
motor
dorsolateral tract of lissaeuer
connection between spinal cord surface and tip of dorsal horn
what does dorsolateral tract of lisaure contain
central processes of sensory pseudounifpolar nueonrs
anterior white commissure
ttract that cross spinal cord
where is teh least white matter found
LS region
what type of inenrvatino do pseudounipolar neurons get
sensory afferent
what do pseudounipolar neurons synpatse with
interneurons or preganglionic sympahtetic neurons
what do interneurons synpase with
motor nuclei in ventral horn motor nucli
what type of innervation do motor neuron get
effect motor innervation
what type of innervation do motor neuron get
efferent motor innervation
