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medulla of brainstem
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A positive finding in an adult represents upper motor neuron disease of the pyramidal tract?
Babinski's reflex
What are the subdivisions of pyramidal tracts?
Vestibulspinal tract (majority of its fibres are uncrossed)Olivospinal tractMedial Reticulospinal tract*mnemonic to memorize: V-O-MER
What are the types of neurons that can be found in the external granular and external pyramidal layers of neocortex?
in external granular (layer 2) = stellate + small pyramidal neuronsin external pyramidal (layer 3) = medium pyramidal neurons
Advantage of the breathing tract cross the alimentary canal in the throat?
It allows us to swallow and breathe and breathe and talk at the same time. The vapors from he tract can help with eating the food.
What is the molecular shape of ammonia?
pyramidal
What is lateral corticospinal tract?
Lateral corticospinal tract is the part of pyramidal tract that consists of crossed pyramidal fibres. So, it's also called as "crossed pyramidal tract".as for anterior corticospinal tract, it consists of uncrossed pyramidal fibres.
What are the extra-pyramidal tracts that cross to the opposite site of spinal cord?
Rubrospinal tractTectospinal tractLateral reticulospinal tract
The pyramidal tract is the major descending voluntary motor tract?
the corticospinal tract and the pyramidal spinal tract are the same tract. yes this tract is the main voluntary motor tract, remember that this tract split in two after the decussation of pyramids (hence the term pyramidal tract) the fibres that do decussate create the lateral portion which innervates the limbs, shoulders and neck the fibers that dont decussate here continue ipsilaterally creating an anterior/ventral portion which innervate the truck, these eventually do decussate at their spinal exit level
What are the sites of origin of the pyramidal tract?
the pyramidal cells in layer 5 of areas 4, 6 ,3-1&2
A positive finding in an adult represents upper motor neuron disease of the pyramidal tract?
Babinski's reflex
Who supposedly had pyramidal tract involvement in the book the Westing Game?
The character Otis Amber supposedly had pyramidal tract involvement in the book "The Westing Game." This detail is revealed as part of his background when he explains that he was once a talented dancer but lost his abilities due to the condition.
If you suspect pyramidal tract lesion what do you check?
Disorders of the pyramidal tracts are characterized by spasticity and paralysis (e.g., stroke). The pyramidal motor system originating in the motor cortex provides control of delicate muscle movement. Tracts of the pyramidal motor system are the corticospinal tract, cortibulbar tract, coricopontine. It is often difficult to delineate a pyramidal from an extrapyramidal lesion during a clinical assessment. Good link for explanation: http://books.google.com/books?id=yY5scDAv8oUC&pg=PA60&lpg=PA60&dq=assess+pyramidal+motor+system+lesion&source=bl&ots=UyFuRjg71r&sig=xj0Gq91LYkRlVCZdra6mH6LTCPo&hl=en&ei=84LyScjSOpOwMfbP_MIP&sa=X&oi=book_result&ct=result&resnum=1#PPA67,M1
What is the type of neurons that are present in the internal pyramidal layer of neocortex?
The "internal pyramidal layer" is the 5th layer of neocortex. You can find lots of large pyramidal neurons at this layer and they project their axons to subcortical structure.You can also find the "giant pyramidal cells of Betz" at this 5th layer of the motor areas. They are very large and they send their axons to corticospinal tract.
Is Spastcity pyramidal or extra pyramidal?
pyramidal
Where does crossing over occur?
* Most of the cortico-spinal fibers (about 90%) cross over to the contralateral side in the http://www.answers.com/topic/medulla-oblongata (http://www.answers.com/topic/decussation-of-the-pyramids). Those that cross in the medulla oblongata travel in the http://www.answers.com/topic/lateral-corticospinal-tract. * The remainder of them (10%) cross over at the level that they exit the http://www.answers.com/topic/spinal-cord, and these travel in the http://www.answers.com/topic/anterior-corticospinal-tract. Most of the cortico-spinal fibers (about 90%) cross over to the contralateral side in the medulla oblongata (pyramidal decussation). Those that cross in the medulla oblongata travel in the lateral corticospinal tract. The remainder of them (10%) cross over at the level that they exit the spinal cord, and these travel in the anterior corticospinal tract.
What is the origin of corticospinal tract?
It arises as the axons of the giant pyramidal cells of Betz mainly from the upper 2/3of the motor area 4 in the precentral gyrus.
What are the subdivisions of pyramidal tracts?
Vestibulspinal tract (majority of its fibres are uncrossed)Olivospinal tractMedial Reticulospinal tract*mnemonic to memorize: V-O-MER
