Study Guide: Exam 6
24 Cards in this Set
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Rostrally
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Higer region of the brain
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Conus medullaris
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Where the spinal cord tapers at its inferior end
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Filum terminale
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Long filament of connective tissue
Where the conus medullaris tapers off to
Anchors spinal cord in so that it is not jostled by body movements
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How many pairs of spinal nerves (pns structure) attach to the spinal cord?
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31
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How are the 31 spinal nerves divided?
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Cervical (8)
Thoracic (12)
Lumber (5)
Sacral (5)
Coccygeal (1)
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Cervical and lumber enlargements
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Where the nerves to upper and lower limbs arise, spinal cord shows obvious enlargements
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Where does spinal cord end?
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At lumber vertebra L3 (at birth)
L1 and L2 (on avg for adults)
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Where does the spinal cord form?
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From the neuroectoderm
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Spinal cord segment
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The region of the spinal cord from which the nerve fibers that form a given spinal nerve emerge
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Dorsal median sulcus And ventral median fissure
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Two grooves that run the length of the spinal cord and partly divide it into right and left halves
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White matter of spinal cord
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The outer region composed of myelinated and unmyelinated axons that allow communication between parts of the brain and spinal cord
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Gray matter of the spinal cord
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Inner region of the spinal cord consisting of mixture of neuron cell bodies; short myelinated axons and dendrites, and neuralgia
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Three types of fibers of white matter
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1. Ascending: send sensory info to the brain
2. Descending: carry motor instruction from brain to spinal cord
3. Commissural: bundle of axons that crosses from one side of the cns to the other and carry info
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Division of white matter of the spinal cord
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Dorsal funiculus
Ventral funiculus
Lateral funiculus
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Gray commissure
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Composed of unmyelined axons that crosses from one side of the cns to the other; makes up the crossbar H shaped gray matter
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Dorsal and ventral horns
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Form columns of gray matter that run the entire length of the spinal cord, in three dimensions
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Lateral horns
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Smallgray matter columns present in the thoracic and superior lumber segments of the spinal cord
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Interneurons
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Receive info from sensory neurons whose cell bodies lie outside the spinal cord in the dorsal root ganglia
An interneuron is a neuron that forms a connection between other neurons.
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Ventral roots
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How motor neurons send their axons out of the spinal cord to supply muscles and glands
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Layers of spinal cord
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1. Spinal dura mater
2. Arachnoid mater
3. Pia mater
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Function of meninges
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Cover and protect the cns
Enclose and protect blood vessels
Contains cerebral fluid
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Epidural space
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External to the spinal dural mater filled with cushioning fat and a network of veins
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Subdural space
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Film of fluid between the dura mater and the arachnoid mater
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Cerebral spinal fluid
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Watery broth that fills the subarachnoid space and the central hollow cavities in the brain and spinal cord; gives bouncy to the cns
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Study Guide: Exam 6