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Spinal Cord Tracts
Rinaldi 1/13/11 lecture
52
Anatomy
Undergraduate 4
01/20/2011

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Cards

Term
spinal nerves (31), cranial nerves (12), autonmoic nerves
Definition
PNS consists of 3 things
Term
afferent or efferent
Definition
functionally peripheral nerves are either
Term
sensory component, motor component, association component to connect and coordinate the various CNS centers
Definition
functionally CNS consists of (3 things)
Term
neuron
Definition
functional unit of the nervous system
Term
multipolar
Definition
motor neurons are what type of neuron?
Term
unipolar
Definition
sensory neurons are what type of neuron
Term
bipolar
Definition
interneurons are what type of neuron?
Term
pathway
Definition
chain of connecting neurons in the CNS
Term
tract, fasciculus, peduncle, lemniscus
Definition
bundle of axons in the CNS can be (4 things)
Term
nerve
Definition
name for a bundle of axons in the PNS
Term
white matter
Definition
contains ascending and descending fiber pathways (axons) in spinal cord
Term
gray matter
Definition
contains nerve cell bodies and synapses (no myelin) in spinal cord
Term
dorsal horn
Definition
gray matter in spinal cord containing sensory neurons
Term
ventral horn
Definition
contains cell bodies for lower motor neurons, & somatic motor neurons destined for skeletal muscle
Term
lateral horn
Definition
contains Autonomic nervous system cell bodies, not in every level of spine, just T1-L2 sympathetic, and S2-S4 parasymapthetic
Term
ventral root
Definition
contains lower motor neurons (peripheral nerve-somatic motor, skeletal muscle)
and sympathetic axons through this
Term
dorsal root
Definition
location of sensory cell bodies of primary sense neuron, no synapse, just cell body
Term
spinal nerve proper
Definition
where dorsal and ventral root meet, somatic motor + visceral motor (autonomic) + sensory (from dorsal root)
Term
dorsal/ventral ramus
Definition
branches of spinal nerve proper
Term
fasciculus gracilis, and fasciculus cuneatus
Definition
2 parts.tracts of posterior column
Term
fasciculus gracilis
Definition
posterior, medial spinal column does conscious propioception for the lower body
Term
fasciculus cuneatus
Definition
lateral posterior column tract, does conscious proprioception for the upper body
Term
corticospinal tract
Definition
mid-sides colmn of spinal cord- motor for upper motor neurons
Term
spinocerebellar tract
Definition
mid-lateral rim, unconscious proprioception
Term
spinothalamic tract
Definition
anterior rim, pain/temp and light touch
Term
pain & temp, proprioception, light touch
Definition
3 main sensory systems into the spinal cord
Term
streognosis
Definition
the ability to recognize objects by touching and handling them with eyes closed
Term
sensory fibers
Definition
tend to synapse before they cross over the midline
Term
cross over at spinal level and ascend to opposite side of brain (thalmus and cerebral cortex)
Definition
pain and temp, pathway to brain
Term
dorsal horn
Definition
location of pain and temp neuron in spinal cord
Term
ascends spinal cord on same side, then crosses over in the brain stem
Definition
conscious proprioception, pathway to brain
Term
2 tracts, one neuron crosses over as part of thespinothalamic tract, one neuron ascends on same side in the posterior column
Definition
pathway of light touch to brain
Term
dorsal horn
Definition
where do light touch sensory neurons enter the spinal cord
Term
neuron enters and ascends on same side via spinocerebellar tract to the cerebellum
Definition
what is the path of unconscious proprioception to the brain
Term
1st neuron motor cortex, axon crosses in brain stem, takes corticospinal tract, synapse with neuron in ventral horn
Definition
pathway of a motor neuron from brain
Term
upper motor neuron
Definition
first neuron in somatic motor pathway, cell body in motor cortex of brain
Term
lower motor neuron
Definition
2nd neuron in somatic motor pathway, cell body in ventral horn
Term
UMN defect
Definition
UMN or LMN defect? spastic paralysis
Term
UMN defect
Definition
UMN or LMN defect? no atrophy
Term
UMN defect
Definition
UMN or LMN defect? fasciculation and fibrilations not present
Term
UMN defect
Definition
UMN or LMN defect? hyperreflexia
Term
UMN defect
Definition
UMN or LMN defect? babinski reflex may be present
Term
LMN defect
Definition
UMN or LMN defect? flaccid paralysis
Term
LMN defect
Definition
UMN or LMN defect? significant atrophy
Term
LMN defect
Definition
UMN or LMN defect? fasciculations and fibrillations present
Term
LMN defect
Definition
UMN or LMN defect? hypOrreflexia
Term
LMN defect
Definition
UMN or LMN defect? no babinski reflex
Term
cerebral palsy
Definition
disease characterized by inability to have smooth muscle control due to an upper motor neuron lesion
Term
fasciculations
Definition
occur when small groups of muscle visibly twitch as a result of spontaneous discharge of motor neurons with activation of motor units
Term
fibrillations
Definition
are minute contractions that can only be detected with electromyography studies of the muscle in a physician's office.
Term
fibrillations
Definition
occur when, after denervation of a muscle, additional acetylcholine receptors develop along the surface of muscle fibers causing the muscles fibers to respond to minute amounts of free acetylcholine in the circulating blood. (seen with EMG studies)
Term
babinski sign
Definition
scratch sole of foot from lateral heel to toes. positive sign if the person extends of fans out their toes. can see in newborns sometimes. (positive test is not normal)
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