Ascending Pathways Flashcards
The somatosensory pathways refer to the bundles of ascending fibers from the spinal cord to higher centers that are known as
Ascending tracts
In the first order neuron, a peripheral process connects with a ___________
sensory receptor ending
In the first order neuron, a __________ process enters the spinal cord through the posterior root to synapse on the second-order neuron
central
The ascending neuron that gives rise to a projection fiber that passes to a sensory ganglion of the cerebral cortex
Third-order neuron
This is formed from the ascending and descending branches of the Lateral Spinothalamic tract that travel for a distance of one or two segments of the spinal cord
Posterolateral Tract of Lissauer
Fibers of the first-order neuron of LST terminate by synapsing with cells in the __________ in the posterior gray horn.
substantia gelatinosa
As the lateral spinothalamic tract ascends through the medulla, it lies near the lateral surface and between the ________ nucleus and the _______ nucleus of the trigeminal nerve.
inferior olivary nucleus
spinal nucleus
Components of the Spinal Lemniscu
Anterior and Lateral Spinothalamic and Spinotectal tract
Where are emotional reactions initiated in the pathway of the Spinal lemniscus?
VPL
The role of the _____________ is interpreting the quality of the sensory information at the level of consciousness
cerebral cortex
Termination of the majority of the slow pain fibers in the lateral spinothalamic tract
Reticular formation
Responsible for the interpretation of pain in relation to past experiences
POSTCENTRAL GYRUS
The part of the cerebral hemisphere involved with the interpretation of the emotional aspect of pain is which of the following?
Cingulate gyrus
Concerned with the interpretation of pain stimuli from the internal organs of the body and brings about an autonomic response
Insula
Fasciculus gracilis contains long-ascending fibers from which segments of the SC?
sacral, lumbar, and lower six of the thoracic spinal nerves (T7 – T12)
Fasciculus cuneatus contains long-ascending fibers from which segments of the SC?
the upper six of the thoracic spinal nerves and all the cervical spinal nerves
Both short and long descending fibers of the posterior white column are involved with ____________ reflexes
intersegmental
Where is the BS location of the nucleus cuneatus and gracilis?
Medulla O.
The axons of the second-order neurons of the Posterior white column are called ___________
internal arcuate fibers
The internal arcuate fibers ascend as a single compact bundle, the _______________, travel through the medulla oblongata, pons, and midbrain to reach the thalamus
medial lemniscus
What is the second-order neuron of the spinocerebellar tract?
Nucleus Dorsalis or Clarke’s column
The nucleus dorsalis extends only from which spinal cord segments?
C8 – L3 or L4
Which SPINOCEREBELLAR TRACT have majority of its axons crossing the opposite side?
Anterior
Which of the SPINOCEREBELLAR TRACTS enter through the superior cerebellar peduncle
ANTERIOR SPINOCEREBELLAR TRACT
Tract that brings about movements of the eyes and head toward the source of the stimulation
Spinotectal tract
Peripheral process of the visceral sensory cells receives nerve impulses from ____________ receptor endings in the viscera
pain and stretch
Causes of visceral pain:
▪ ischemia
▪ chemical damage
▪ spasm of smooth muscle
▪ distension
Fibers of the cuneocerebellar tract are known as the:
posterior arcuate fibers
