Control Lecture 2: Ascending sensory pathways I Flashcards
Which pathway carries “essential” sensory information such as pain and temperature?
Spinothalamic tract
Which pathway carries fine touch discriminatory, proprioception and pressure information?
Dorsal column pathway
What are the neurones like in the spinothalamic tract?
Thin, unmyelinated
What are the neurones like in the dorsal column pathway?
Thick, myelinated
Where is the primary somatosensory cortex of the brain?
Post-central gyrus
Where is the first cell body located in ascending sensory pathways from the body?
Dorsal root ganglion
Where in the thalamus is the second synapse in ascending sensory pathways from the body?
Ventroposterolateral nucleus
Is sensory information from the body ipsilateral or contralateral?
Contralateral
Is the spinothalamic tract located ventrally or dorsally in the spinal cord?
Ventrally
Where does the spinothalamic tract travel in the medulla?
Lateral lemniscus
Within what structure does the spinothalamic tract cross the midline?
In the anterior white commissure
Which is more medial, the gracile fascicle or the cuneate fascicle?
Gracile fascicle
Where does the dorsal column pathway become contralateral?
Between the closed and open medulla
Where does the cuneate fascicle carry nerve fibres from?
Above the level of T6
What structures in the closed medulla contain the gracile and cuneate nuclei?
Gracile and cuneate tubercles
Where are the dorsal column fibres carried in the open medulla?
Medial lemniscus
Which of the pathways synapses more medially within the VPL nucleus of the thalamus?
Dorsal column pathway
Within what fibres does the dorsal column pathway become contralateral?
Internal arcuate fibres
Where is the second synapse in the dorsal column pathway located?
Gracile and cuneate nuclei
