Lecture 16- Brainstem 3 Flashcards
What “broadman’s area”the primary motor cortex? What lobe is it located in?
area 4- precentral gyrus of the frontal lobe
Where are the first order neurons for the corticospinal and corticobulbar tracts?
primary motor cotrex (area 4-precentral gyrug of the frontal lobe)
Where does the decussation of the lateral corticospinal tract occur?
caudal medulla
What tract carries taste fibers from the nucleus solitarius to the VPM of the thalamus?
central tegmental tract
Where do fibers in the nucelus of the tractus solitarius project?
- reflex to dorsal motor nucleus of X
- aascending to VPM of thalamus
- Reticular formation and salivtory nuclei
- ascending to parabrachial nucleus
Where do taste fibers in the parabrachial nucleus project?
hypothalamus-visceromotor response
amygdala- learning about food
What pathway do axons use to project from the cochlear nuclei to the inferior colliculus?
lateral lemniscus
What pathway do fibers use to project bilaterally to the superior olivary complex?
trapezoid body
Where do fibers from the superior olivary complex project?
to the inferior colliculus via the lateral lemnsicus
Where do fibers containing auditory information in the inferior colliculus project to?
medial geniculate body (nucleus)(via the brachium of the inferior colliculus)
Where do fibers in the medial geniculate body project?
primary auditory cortex (areas 41)
What is the purpose of the lateral vestibulospinal tract?
antigravity control
Input from the fastigial nucleus of the cerebellum travels in which peduncle to leave the cerebellum?
inferior cerebellar peduncle (ipsilateral)
Input from the dentate, emboliform and glosbose nuclei travel to the contralateral side of the body via what structure?
superior cerebellar peduncle
What system is the superior olivary nucleus involved in?
auditory (S-O–> Sound)
What system is the lateral lemniscus involved in?
auditory system
Which cerebellar peduncle contains the majority of the efferent fibers from the cerebellum?
superior cerebellar peduncle
What type of fibers are carried in the dorsal spinocerebellar tract?
muscle sense from C8 and below
What tract carries muscle cense from above C8?
Cuneocerebellar Tract
Where does the cuneocerebellar tract terminate?
external cuneate nucleus
What tract terminates in the external cuneate nucleus?
cuneocerebellar tract
What fibers does the olivocerebellar tract?
motor and sensory input to the cerebellum from the inferior olive
Where are the auditory fibers of the lateral lemniscus headed?
inferior colliculus
What fiber types does the brachium of the inferior colliculus contain?
auditory afferents to the medial geniculate nucleus (HEAR ME)
What type of sensory information does the central tegmental tract contain?
taste (from nucleus of the solitary tract)
Vestibulation (from vestibular nuclei)
to VPL in thalamus
What is the role of the MLF/ Medialvestibulospinal tract?
vestibulo-ocular control of head eye and neck movement
How does information from the vestibular nuclei travel to the cerebellum?
Via the inferior cerebellar peduncle
What is the role of the reticulospinal tract?
receives input from vestibular nuclei-involved in muscle tone and posture
What 4 afferent pathways and 1 efferent pathway travel through the inferior cerebellar peduncle?
4 Afferent
- Olivocerebellar (inf. olive)
- Vestibulocerebellar (vestibular nuc.)
- Dorsal Spinocerebellar (clarkes column)
- Cuneocerebellar (external cuneate nuc)
1 Efferent
-Output from fastigial nucleus to the reticular formation
