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22 Cards in this Set
- Front
- Back
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What are multipolar neurons?
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Synapse with skeletal muscle, have many dendrites. (motor neurons)
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What are pseudounipolar neurons?
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Recieve sensory information from the skin, have one continuous axon/dendrite structure. (primary sensory neurons)
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What is a nucleus?
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A collection of neurons (cell bodies) WITHIN CNS (usually all do the same thing)
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What is a ganglion?
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A collection of neurons (cell bodies) OUTSIDE the CNS.
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What is a tract?
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A collection of neuronal processes INSIDE the CNS (usually process=axons but unipolar have no axons)
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What is a nerve?
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A collection of neuronal processes OUTSIDE or in the PERIPHERY of the CNS (usually axons)
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What is Grey matter?
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Material that is unmyelinated (no lipid coat) primarily neuronal cell bodies and dendrites.
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What is White matter?
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Mylenated matireial, primarily axons.
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2 Functions of the spinal cord
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- Carries efferent (motor) information away from the brain
- Carries afferent (sensory) information towards the brain |
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What is the cervical enlargement on the spinal cord?
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An enlargement of the diameter of the spinal cord that accomodates information from the upper limbs
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What is the lumbar enlargement?
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An enlargement of the spinal cord associated with the lower limbs.
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What is the Conus medullaris?
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The tapered end of the spinal cord.
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What is the Cauda equina?
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The continuation of dorsal and ventral roots of spinal nerves below the SECOND lumbar level. "horse's tail"
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What are the three things that protect the spinal cord?
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Vertebral column (bone), Meninges (connective tissue coverings that encircle the spinal cord), and Spaces and potential spaces associated with the meninges.
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What is the outermost meninge?
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The Dura mater "tough mother" forms a long tubular sheath and is continuous with the dura around the brain. It enters the bony sacru mand tapers to and as a ligament attached to the coccyx.
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What is the second layer of the meninges?
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The arachnoid mater "spider like". Is composed of 2 parts, a thin transparent film inside the Dura mater and weblike exensions that stretches to the pia mater.
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What is the third layer of the meninges?
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The pia meter "delicate mother" a very thin layer of conective tissue that follows every cerve of the the spinal cord and brain. Consists of two extensions, the filum terminale and the denticulate ligaments.
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What is the filum terminale?
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An extension of the pia mater that extends from the conus medularis and extends inferiorly to attach to the dura mater.
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What are the denticulate ligaments?
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"Tooth like" appearance. Ligaments that attach the pia mater to the arachnoid and dura mater. Provide stability for the spinal cord against motion in th vertebral column.
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What are the spaces and the potiential spaces associated with the meninges? Which space holds the CSF?
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Epidural space (above the dura), subdural space (below the dura), subarachnoid space (below the arachnoid), contains CSF.
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What are the two sets of nerves the Peripheral nervous system is divided into and how many pairs are associated with each?
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Cranial nerves (12 pairs)- use named foramen in the skull to go to and from their targets and to the brain (control head and neck)
Spinal nerves (31 pairs)- use intervertebral foramen to go to and from their targets and to the spinal cord. Control the trunk and limbs. |
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X
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Lateral horn is between the ventral and dorsal horns. White matter is on the outside, Gray matter is on the inside.
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