Inferior margin ends at L1 to L2
Gives rise to 31 pairs of spinal nerves
Segment: part of the spinal cord supplied by each pair of spinal nerves
Gross Anatomy:
-Arises from the brainstem, superior boundary at the foramen magnum of the skull
-Occupies the upper 2/3 of vertebral canal
Subdivisions of each column
(Dorsal) Contain sensory neurons, receive incoming sensory nerve impulses from body
3 fibrous membranes(Dura mater, Arachnoid mater, Pia mater) that enclose the brain and spinal cord
(Conus Medullaris)Cord tapers to a point at distal end
Involuntary responses to stimuli that are vital to posture, coordination, protection
Down
(Ventral) Contain somatic (voluntary) motor neurons, where outgoing motor nerve impulses exit spinal cord
"horse's tail"- bundle of nerve roots that occupy the vertebral canal from L2 to S5
Abundantly myelinated axons
-Carry signals from one part of the CNS to another
Divided into 4 regions Cervical, Thoracic, Lumbar, and Sacral
Nerve fibers conduct sensory and motor information up and down the spinal cord
Spinal cord contains central pattern generators: groups of neurons that coordinate repetitive sequences of contractions for walking
Central area shaped like a butterfly
-neuron cell bodies with little myelin
-Site of information processing, synaptic integration
Adhere to dura mater
-subarachnoid space: deep to arachnoid mater, filled with CSF
-separated from pia by fibers spanning the subarachnoid space
Connects right & left sides
-has central canal lined with ependymal cells and filled with CSF
FUNICULI: 3 Pairs of these white matter bundles-posterior (dorsal), lateral, anterior (ventral) ________ on each side
Delicate membrane that follows contours of spinal cord
-continues inferiorly as a fibrous terminal filum(filum terminale)
Consists of bundles of _____ that course up and down the cord, providing communication between different levels of the CNS.
________ matter of the spinal cord surrounds the gray matter.
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