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Spinal Cord ((meningeal coverings (dura mater, arachnoid mater, pia…
Spinal Cord
meningeal
coverings
dura mater
arachnoid mater
pia mater
formed by
segments
is formed by segments
8 cervical
12 thoracic
5 lumbar
first 2
5 sacral
upper sacral
intermediolateral
column
small lateral projection
of the intermediate gray matter
contains
cells of origin of the
autonomic nervous system
(ANS)
thoracic
contains
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sacral
contains
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1 coccygeal
enlarged segments
C5 to T1
upper limb
L2 to S2
lower limb
due to
large numbers
of motor neurons
gray matter
made up of
neuronal cell bodies
neuropil
space between neurons
containing
glia
dendrites
axons
divided into
horns
(kind of butterfly
or H)
dorsal
reaches out
to connect with
surface of the spinal cord
where the dorsal nerve rootlets
enter the spinal cord
ventral
commissural
gray matter
(between the horns)
encloses
central canal
called
intermediate
gray matter
#
white matter
surrounds
(except for
the dorsal horns)
gray matter
#
consists of
longitudinal axons
forming
tracts
(distinct
bundles)
divided into
columns
dorsal
dorsal columns lie
side by side
posterior median sulcus
(common medial border)
lateral
ventral
separated by
a deep fissure
ventral median fissure
controls
voluntary muscles of
limbs
trunk
viscera
and
blood vessels
of
thorax
abdomen
pelvis
lies in
vertebral canal,
inside
spinal vertebrae
from which arise
spinal nerves
formed by
rootlets
bundled to form
dorsal root
sensory fibers
has
spinal
(dorsal root)
ganglion
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ventral root
motor fibers