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22 Cards in this Set

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What are multipolar neurons?
Synapse with skeletal muscle, have many dendrites. (motor neurons)
What are pseudounipolar neurons?
Recieve sensory information from the skin, have one continuous axon/dendrite structure. (primary sensory neurons)
What is a nucleus?
A collection of neurons (cell bodies) WITHIN CNS (usually all do the same thing)
What is a ganglion?
A collection of neurons (cell bodies) OUTSIDE the CNS.
What is a tract?
A collection of neuronal processes INSIDE the CNS (usually process=axons but unipolar have no axons)
What is a nerve?
A collection of neuronal processes OUTSIDE or in the PERIPHERY of the CNS (usually axons)
What is Grey matter?
Material that is unmyelinated (no lipid coat) primarily neuronal cell bodies and dendrites.
What is White matter?
Mylenated matireial, primarily axons.
2 Functions of the spinal cord
- Carries efferent (motor) information away from the brain
- Carries afferent (sensory) information towards the brain
What is the cervical enlargement on the spinal cord?
An enlargement of the diameter of the spinal cord that accomodates information from the upper limbs
What is the lumbar enlargement?
An enlargement of the spinal cord associated with the lower limbs.
What is the Conus medullaris?
The tapered end of the spinal cord.
What is the Cauda equina?
The continuation of dorsal and ventral roots of spinal nerves below the SECOND lumbar level. "horse's tail"
What are the three things that protect the spinal cord?
Vertebral column (bone), Meninges (connective tissue coverings that encircle the spinal cord), and Spaces and potential spaces associated with the meninges.
What is the outermost meninge?
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.
What is the second layer of the meninges?
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.
What is the third layer of the meninges?
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.
What is the filum terminale?
An extension of the pia mater that extends from the conus medularis and extends inferiorly to attach to the dura mater.
What are the denticulate ligaments?
"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.
What are the spaces and the potiential spaces associated with the meninges? Which space holds the CSF?
Epidural space (above the dura), subdural space (below the dura), subarachnoid space (below the arachnoid), contains CSF.
What are the two sets of nerves the Peripheral nervous system is divided into and how many pairs are associated with each?
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.
X
Lateral horn is between the ventral and dorsal horns. White matter is on the outside, Gray matter is on the inside.