Lab Section 3 Flashcards
(45 cards)
what nucleus creates the anterior tubercle and what does it project from and to?
anterior nucleus of the thalamus
receives input from the mammilary bodies and projects to the cingulate gyrus
which two thalamic nuclei are involved in emotion?
anterior nucleus and dorsomedial nucleus
which two thalamic nuclei are involved in motor function? where do they receive input from and where do they project to?
Ventral anterior and ventral lateral nuclei
both receive input from the basal ganglia and cerebellum
both project to the premotor cortex and the VL projects to the precentral gyrus also
which two thalamic nuclei are involved in somatosensory function? How are they different?
VPL and VPM
VPL receives input from the body and the VPM receives input from the face
which thalamic nucleus is involved with visual perception and language?
the pulvinar
which thalamic nucleus is involved with audition? what are its inputs and projections?
medial geniculate nucleus
input from the inferior colliculus
projects to the auditory cortex
which thalamic nucleus is involved with vision? what are its inputs and projections?
lateral geniculate nucleus
input from the optic tracts
projects to the visual cortex
which thalamic nucleus is involved with attention and arousal? where does it project to?
intralaminar nucleus
projects to the basal ganglia and diffusely to the cortex
when does information from the medial lemniscal system cross?
at the internal arcuate fibers in the medulla. Travels from the gracile and cuneate nuclei to the medial lemniscus
what does protopathic information travel on before it crosses the spinal cord? where does it make its first synapse?
Lissauer’s Tract
dorsal horn of the gray matter
Where does protopathic information cross the spinal cord?
in the anterior white commissure near to where it entered the cord
where does the ALS synapse? Where does it go following that synapse?
diffusely around the brainstem but mostly in the reticular formation
goes to the VPL (mostly) and DM nuclei of the thalamus
Injury to the spinocerebellar system will cause deficits on what side?
ipsilaterally
where does the dorsal spinocerebellar tract enter the cerebellum?
through the inferior cerebellar peduncle
how does the spinocerebellar tract first travel through the CNS? where does it synapse?
via the gracile and cuneate fasciculi
synapses in Clarke’s Nucleus and the Accessory Cuneate Nucleus respectively
after the first synapse, how does the body’s proprioceptive information travel?
as the dorsal spinocerebellar tract
name the four nuclei of the trigeminal nerve and what types of information they are associated with.
Principal sensory nucleus- epicritic information
spinal nucleus- pontine portion is epicritic, medullary portion is protopathic
mesencephalic nucleus- proprioceptive information
motor nucleus- motor (although receives proprioceptive input for reflexes)
describe the flow of facial epicritic sensation.
CN V > Principal sensory nucleus and pontine portion of the spinal nucleus > (cross midline) > medial lemniscus > VPM of thalamus > internal capsule > S1
describe the flow of facial protopathic sensation.
CN V > descending spinal tract of V > spinal nucleus > (cross midline) > reticular formation > VPM of thalamus > internal capsule > S1
describe the flow of facial proprioceptive information.
CN V mesencephalic tract > mesencephalic nucleus of V > motor nucleus of V > reticular formation > cerebellum
describe the motor component of trigeminal
corticobulbar tract > motor nucleus of V > CN V > muscles of mastication
what does the corticobulbar tract do and what will happen with unilateral damage to it?
controls the cranial nerve nuclei
contralateral weakness-not significantly because of bilateral projections (excluding CN VII and XII)
describe the corticopontine tract.
it is a motor tract that descends from the cortex and terminates on the pontine nuclei
where do the pontine nuclei project to?
the contralateral middle cerebellar peduncle
