week 5 quiz Flashcards
what is the visual representation of the cervical spine section?
large, oval, large amount of white matter
what is the visual representation of the lumbar spinal cord section?
round, large, most amount of gray matter
what visually represents the thoracic spinal cord section?
oval, but smaller, lateral horn for ANS, cell bodies for sympathetic nervous system
what is the visual representation of the sacral spinal cord section?
similar appearance to lumbar, but smaller
What is the dorsal ramus?
contains somatic and visceral motor fibers and innervates the back
what is the function of the dorsal column/medial lemniscus in the somatosensory pathway?
discriminative touch/pressure/vibration and proprioception
what is the receptor for touch/proprioception?
mechanoreceptors-encapsulated nerve endings sensitive to mechanical stimulation
what is the ventral ramus?
larger branch that innervates ventrolateral structures and limbs, contributes too plexuses
In the Dorsal column/medial lemniscus pathway, what is the pathway for the 1st order neuron?
mechanoreceptor->peripheral nerve->spinal nerve->dorsal root->dorsal column-fasiculus cuneatus/gracilis->dorsal column nucleii-nucleii cuneatus/gracilis SYNAPSE
In the Dorsal column/medial lemniscus pathway, what is the pathway for the 2nd order neuron?
dorsal column nucleii-nucleus gracilis/cuneatus->internal arcuate fibers->DECUSSATION->medial lemniscus->thalamus->SYNAPSE
In the Dorsal column/medial lemniscus pathway, what is the pathway for the 3rd order neuron?
thalamus->internal capsule->primary somatosensory cortex
what is the function of the white matter columns of the spinal cord?
transmission of neural impulses along axons.
what is the function of the dorsal column-medial lemniscal pathway?
somatosensation of discrimitive touch, proprioception, vibration
where does the dorsal column-medial lemniscal pathway cross?
internal arcuate fibers in the medulla
what type of receptors are involved in the dorsal column-medial lemniscal pathway?
mechanoreceptors
How does the area of somatosensory cortex homunculus correspond to density of receptors in a given body area?
Increased density of the somatic receptors corresponds to the representative area of cortex.
what is the function of the spinothalamic pathway?
pain and temperature
where does the spinothalamic pathway cross?
spinal segment anterior commisure
what type of receptors are in the spinothalamic system?
nocioreceptors
pathway of first order neuron of spinothalamic
Receptor->peripheral nerve->dorsal root->dorsal horn->synapse
pathway of 3rd order neuron in spinothalamic tract
thalamus->internal capsule->primary somatosensory cortex
pathway of second order neuron
dorsal horn->ventral commissure->decussation->anterolateral tract->thalmus->synapse
