lab final Flashcards
1st synapse for fine touch/ vibrotactile and conscious proprioceptive info for lower extremeties.
afferent; fasciculus gracilis
efferent; medial lemniscus
nucleus gracilis
first synapse for fine tocuh/vibrotactile and conscious proprioceptive info for UPPER EXTREMETIES
aff; fasciculus cuneatus
efferent; medial lemniscus
nucleus cuneatus
first synapse for UNCONSCIOUS proprioceptive info for upper half of body’afferent; cuneocerebellar tract
accessory cueate
1st synapse for temp. pain, light touch of face
receives fibers from CN 5, 7, 9, and 10
spinal trigeminal nucleus
major sensory afferent relay of ANS
rostral receives afferent taste input
major CN that synapse here; 7,9,10
nucleus of the solitary tract
loose collection of nuclei thru all levels of braistem
integrative fxns, like motor control, autonomic input, and regulation of behavioral state (sleep/ awake)
reticular formation
descendign fibers of voluntary motor control from the cortex and projecting into spinal cord (corticospinal tract)
80% Deccussate at level of medulla
pyramids
ascending 2nd order sensory fibers carrying fine tocuh/ vibrotactile and conscious proprioceptive info to the VPL of thalamus from post/dorsal columns
medial lemniscus
ascending temp/ pain/ and light touch pathway.
contralateral info at level of medulla.
Lissauer’s fasciculus gives it input
project to VPL of thalamus
CVA in thalamus disrupts this tract and can cause thalamic pain
spinothalamics (anterior and lateral)
bundel of ascending, decussating 2nd order sensory fiber carrying fine touch/ vibrotactile/ and conscious proprioceptive info to VPL from post/ddorsal columns
deccussate after synapse at nucleus gracilis/cuneatus
internal arcuate decussation
first synapse for temp, pain, and light touch of face
fibers from CN 5, 7, 9, and 10 in relation to somatosensory input from ear
part of the ventral trigeminothalamic tract
involved w trigemianl neuralgia
spinal trigeminal nucleus
1st synapse at afferent vestibular info from scarpa’s ganglia and someitems collection of primary sensory afferent cell bodies from inner ear
projects to cerebellum via vestibulocerebellar pathway and occulomtor muscels via MLF
sends descending projections to spinal cord= regulation trunk motor control and extensor muscles via vestibulospinal tract
vestibular nucleus
large nucleus in medulla
sedns contra projections to cerebellum via olivocerebellar tract
terminate as “climbing fibers” on purkinje cells
receives cerebellar output info for learning complex motor tasks
inferior olivary nucleus
brainstem LMN pool
axons innervate muscles of larynx and pharynx
part of CN 9, 10, and 11
nucleus ambiguus
major motor nucleus contains lower motor axons>muscles of ipsilateral tongue
part of CN 12
hypoglossal nerve
major preganglionic parasymp motor nucleus of CN 10.
innervates lungs, heart, stomach, and GI tract
dorsal motor nucleus of CN 10
inferior most of 3 bundles of axons that connect cerebellum>brainstem.
most unconscious proprioceptive input enters cerebellum thru this (all the cerebellar tracts)
also cerebellar efferent axons> vestibular nuclei
inferior cerebellar peduncle
ascending and decsending fiber tract.
connects vestibular nuclei with CN 3, 4, and 6, along with head, neck, and trunk muscles to regulate vestibulooccular reflexes and coordination
medial longitudinal fasciculus
space in ventral hindbrain
contains csf and choroid plexus
4th ventricle
major CNS center of NE production
found in pons, projects throughout the brain
part of ascending reticular activating system
involved with arousal and alertness
locus ceruleus
superior most of 3 large bundles of axons connecting cerebellum to the brainstem
most cerebellar efferents exit cerebellum here
ventral spinocerebellar tract enters the cerebellum thru this
superior cerebellar peduncle
middle of 3 large bundles of axons from that connect the cerebellum to the brainstem.
cortical input to the cerebellum synapses on ipsilateral pontine nuclei then decussates to cerebellum via this peduncle.
coordinating movements
middle cerebellar peduncle
dorsal portion of pons that contains reticular formation and CN nuclei (sensory and motor)
comprises floor of the 4th ventricle
pontine tegmentum
space in ventral hindbrain containing CSF
4th ventricle
ventral portion of pons that contains cortico-ponto-cerebellar, corticospinal, and corticobulbar fibers as well as pontine nuclei
basis pontis
part of the midbrain roof,
involved in eye tracking and saccades
part of basal ganglia circuit involving sunstantia nigra pars reticulat.
receives afferent input from frontal eye fields and visual association cortices
sends motor output to oculomotor nuclei to the head and neck via the tectospinal tract
superior colliculus
lower motor neuron nucleus of CN3.
regulates pupillary light response through projections to ciliary gg. (post gg for spinchter pupillae)
accommodation reflex
nucleus of edinger westphal nucleus
major midbrain site contains 2 portions
1; pars compacta (dopamine that project to the striatum)
2. pars reticulata (neurons involved in saccades and visual tracking
neuronal cell loss in pars compacta= parkinsons
substantia nigra
large midbrian nucleus receiving cerebellar info
sends descending fibers down to rostral spinal cord via rubrospinal tract
upper body flexor muscle control
bi-directional communication with reticular formation
red nucleus
descending fibers of voluntary motor control from the cortex and projecting to spinal cord (corticospinal and bulbar tracts)
at level of midbrain, cortical input is ipsi
crus cerebri
area surrounding cerebral aqueduct that receives nocioceptive info and projects to the serotonergic raphe nuclei as a part of a major pain inhibiting pathway in the spinal cord
periaqueductal grey
