Lateral Spinothalamic tract Flashcards
The sensory modalities of pain, temperature and non-discrimative touch for the body are carried over why system?
Anterolateral system or
Spinothalamic System
What are the two primary pathways of the Anterolateral system?
1.) Lateral spinothalamic pathway
2.) Anterior spinothalamic pathway
Sensory modalities for the antiero 2/3 of the head, face, oral and nasal cavities utilize what nerve when dealing with pain and non-discriminative touch?
The trigeminal nerve
What sensation is carried by the latearl spinothalamic system?
Pain and Temperature
The sensation of pain affiliated with the Lateral Spinothalamic Pathway is considered what?
Very pervasive and personal
The lateral spinothalamic pathway is named in essence of what?
the position of the fiber bundle of axons from the second neuron of the three-neuron chain
In the Lateral Spinothalamic Pathway the first order neuron is a _______ neuron with its cell body located where?
- ) Pseudounipolar neuron
- ) Dorsal Root Ganglia
The peripheral receptors for the Lateral Spinothalamic Pathway are what fiber type?
Free Nerve Endings (non encapsulated)
—A-delta fibers
–Lightly myelinated
A delta fibers of the Lateral Spinothalamic Pathway carry the sensation of what type of pain? Is it localizable or non-localizable?
Pricking pain that is fairly localizable
The central processes enter the spinal cord where (medially/laterally) and bifurcate where?
Laterally
Bifurcate in the Lissauer’s tract
After entering the dorsal horn the Lateral Spinothalamic Pathway involves a synapse where?
On neurons in substantia gelatinosa/nucleus proprius
What is the neurotransmitter affiliated with the synapse on neurons in substantia gelatinosa/nucleus proprius?
Glutamate
Where is the exact positin of the cell body for the second-order neuron in the Lateral Spinothalamic Pathway?
Most likely in substantia gelatinosa
Where so second order neurons sen their axons?
Across the midline through the anterior white commisure
Second order neuron axons enter through the anterior white commisure in what fashion?
An ascending and oblique (1-2 segements) direction
—this is what forms the Lateral spinothalamic tract on the contralateral side of the cord
The more laterally placed fibers in the lateral spinothalmic tract carry what type of sensation?
Pain and temperature sensations fomr the lower body
The more medially placed fibers in the lateral spinothalmic tract carry what type of sensation?
Pain and temperature sensations from the UE
The Lateral spinothalamic tract ascends through the spinal cord and brain stem to reach what?
Ventral posterolatearl thalamic nucleus (VPL) and intra-laminar thalamic nuclei
Where is the third nueorn cell body located?
Ventral Posterolateral Thalamic nucleus (VPL)
Somatotopic distribution of the latearl Spinothalamic pathway is maintained wihtin the nucleus of what?
The VPL
In the nucleus of the VPL information concerning pain from the LE (lumbar-sacral dermatomes) are located where?
Laterally
Axons of third order neurons leave the VPL and ascend where?
The Primary somatosensory cortex via the superior thalamic radiations
The superior thalamic radiations is located where?
The medial part of the posterior limb of the internal capsule
Primary somatosensory cortex is located where in the postcentral gyrus?
Cortical areas, 3, 1, 2
