Various dorsal root ganglia (DRG)
The cell bodies that send axons to form the fasciculus grasilis, and cuneatus tracts are located where?
This tract is slender shaped, and is located in the medial aspect of the dorsal funiculus.
Fasciculus grasilis, Spinothalamic, Anterior spinocerebellar, the tract that is both ascending and descending is fasciculus proprius.
These ascending tracts run to all the cord levels, with the exception to one tract that is both ascending and descending. Name that tract as well.
gracilis, cuneatus, posterior spinocerebellar, cuneocerebellar
List the ascending tracts that are ipsilateral-or cell bodies stay on the same side.
All cord levels, enlarging as it ascends the cord.
The levels that the spinothalamic tract are found at are?
This tract does NOT run below L3 and is carried up the gracilis and synapses in Clarke's Nucleus
Which tracts share the same functions of simply being major pathways carrying such sensations(partic. from distal ends of extremities) such as1. Discrimination of touch(2pt.) and Vibratory sensations 2. Kinesthetic sensation(conscious proprioception)
Name the primary tract (other ascending tracts do too) that is formed from axons that come from cell bodies in the gray horns of the cord.
in the cord's gray laminae
The dorsal root fibers bringing sensations into the cord must synapse where?
Name the tract that runs to all cord levels and will naturally enlarge as it ascends the cord.
Mostly contralateral fibers, Spinothalamic tract
Name the type of fibers and what tract crosses gradually in the anterior region and abruptly in the lateral extremes.
(crosses) gradually in the anterior region, (abruptly crosses) in the lateral extreme
Name where the spinothalamic tract crosses first, and then abruptly crosses after.
functions of spinothalamic tract
what is the connection if any, (and tract name) this tract has with Pain and Thermal Input, and Light Touch.
Especially in the lateral funiculus, anterior funiculus, spinothalamic tract
Functions of pain and thermal input, and light touch occur where and in what tract?
The spinothalamic tract, the anterior and lateral spinothalamics
This tract used to be considered two seperate tracts, but now is considered one continuous tract, even though some functional variation is recognized at the extremes.(name the tract now, and give the name(s) it used to be as well.)
Analgesia, thermoanesthesia, spinothalamic tract, opposite side of body
Lesions here in this tract lead to________(pain loss), and ___________(temperature loss) to where?
Thalamus, higher cortical centers
Some appreciation for pain and thermal sensation may be established where? Relay to ______is necessary for complete conscious appreciation?
Fasiculus gracilis, fasciculus cuneatus, spinothalamic tract
Name three ascending tracts functions that all end at the post central gyrus?
Post central gyrus
This is considered to be the primary(1') sensory cortex for taste, hearing, and seeing in the brain
(the pathway of the) spinothalamic tract
Name the tract that has a pathway that terminates in the opposite side of where the sensation is coming from
T6 cord level
In reference to the gracilis, and cuneatus tracts, these fibers now enter "cuneatus" at what level?
Anterior Spinocerebellar tract
This tract has a location along the periphery of the lateral funiculus and runs anterior to posterior
both run along the periphery of the lateral funiculus, posterior runs posterior to anterior (spinocerebellar tract), anterior runs anterior to posterior (spinocerebellar tract)
Compare and contrast the locations of the anterior and posterior spinocerebellar tracts
Known as a "double crosser" b/c most of these fibers cross in the cord, and then cross back again as they enter the cerebellum.
mostly lumbosacral cord's gray laminae
The cell bodies-fibers origins- of the anterior spinocerebellar tract are found where?
Posterior spinocerebellar tract, (C8-L3), below L3.
this tract has fibers that originate from cell bodies in Clarke's Column (nucleus) found in what part of the spine? This tract is not found running ______?
Posterior spinocerebellar tract
This tract is below L3, inferior to L3 proprioceptor fibers are carried up(hitch-hike) in gracilis up to L3-L2 levels, and synapses in Clarke's Nucleus.
in the cerebellum, superior cerebellar peduncle
The anterior spinocerebellar tract has fibers that terminate ___________ via the _______(some fiber exceptions)
Fibers terminate in the cerebellum via the inferior cerebellar peduncle (some fiber exceptions)
Name the place of termination for the fibers of posterior spinocerebellar tract
Function of the anterior spinocerebellar tract
Sends to the cerebellum input on general state of gross movements of lower body, and general activity of what is about to happen from motor neurons in that part of the cord.
Function of the Posterior spinocerebellar tract
Proprioceptive input dealing mainly with fine movements from what has just happened in the muscle itself.
Ant. spinocerebellar, post. spinocerebellar
tract that's function describes What is about to happen,tract that describes What just happened
Proprioceptive, fine movements, posterior spinocerebellar tract
____________fibers dealing with___________from the lower extremity may enter the cord at levels below clarke's nucleus in this tract.
function of the Cuneocerebellar tract
Proprioceptive input of fine movements from the pectoral girdle and extremity.
M.O.'s accessory cuneate nucleus
The cuneocerebellar tracts fibers enter the cervical cord, and ascend to synapse________?
inferior cerebellar peduncle
The cuneocerebellar tract's fibers ascend to the cerebellum thru_________?
the Cuneocerebellar tract
This tract does for our arms and hands what clarke's nuclei and the posterior spinocerebellar tracts do for the lower body, legs and feet.