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34 Cards in this Set

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Function of the Spinal Cord
1) involved in the sensory and motor innervation
2) provides 2 way communication pathway for signals between body and brain
3) major center for reflexes
conus medullaris
inferior, tapered end of spinal cord proper
filum terminale
filamentous end of the meninges, "tie down"
attaches spinal cord to coccyx, anchoring it in place
cauda equina
individual spinal nerves within the spinal canal
number of spinal nerves
31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, 1 coccygeal
cervical enlargements
nerves serving upper limbs
lumbar enlargements
nerves serving lower limbs
dorsal (posterior) median sulcus
is a groove that runs the length of the cord and partly divides it into right and left halves
ventral (anterior) median sulcus
is a groove wider than the dorsal median sulcus, runs the length of the cord and partly divides it into right and left halves
rostrally
means towards the snot
caudally
means towards the tail
white matter of the spinal cord classification
1) Ascending
2) Descending
3)Commissural
Ascending fibers
carry sensory information from the sensory neurons of the body to the brain
Descending Fibers
carry motor instructions from the brain to the spinal cord to stimulate muscles contractions or gland secretions
Commissural
commissural fibers carry information from one side of the spinal cord to the other
commissure
bundle of axons that cross from one side of the CNS to the other,
central canal
contains CSF (cerebro spinal fluid), within the gray commissure
dorsal (posterior) horns
consist entirely of interneurons, receive information from sensory neurons whose cell bodies lie outside the spinal cord

somatic and visceral sensory nuclei
ventral (anterior) horns
contain cell bodies of motor neurons that send their axons out of the spinal cord to supply muscles and glands

somatic motor control
4 zones of spinal cord gray matter
1) Somatic Sensory
2) Visceral Sensory
3) Visceral Motor
4) Somatic Motor
lateral Horns
visceral motor control

contain cell bodies of motor neurons that send their axons out of the spinal cord to supply muscles and glands
white matter of the spinal cord is divided into three kinds of
funiculi
funiculi
a cordlike structure, a division of the white matter of the spinal cord

contain many fiber tracts , composed of axons that all have similar destinations and functions
Name the 3 types of Funiculi of the Spinal Cord
dorsal funiculus, ventral funiculus and lateral funiculus
meninges
three connective tissue membranes that lie just external to the brain and spinal cord
functions of the meninges
1) cover and protect the CNS
2) enclose and protect the blood vessels that supply the CNS
3) contain the cerebrospinal fluid
3 parts of the meninges
from external to internal)
1) dura mater
2) arachnoid mater
3) Pia Mater
dura mater
outermost layer, leathery
strongest of the meninges
composed of dense fibrous CT, forms a protective covering around the structures of the CNS
Spinal Dura mater
dura mater that covers the spinal cord
epidural space
just external to the spinal dura, filled with cushioning fat and veins
Arachnoid Mater
lies just deep to the dura mater
weblike middle layer of the meninges
subdural space
separates spinal sheath from middle arachnoid mater
subarachnoid space
separated arachnoid mater from pia mater
pia mater
most internal and most delicate of the three meninges covering the brain and spinal cord