Exam 2 Flashcards
Nuclei of the Trigeminal Nerve
- motor trigeminal nuclei
- principle sensory trigeminal nuclei
- mesencephalic trigeminal nuceli
- spinal trigeminal nuclei
motor tigeminal nuclei function
give rise to efferent to muscles of mastication
principle sensory trigeminal nuclei function
afferent discriminate touch, light touch, proprioception to face, dental pressure
mesencephalic trigeminal nuclei function
afferent proprioception to jaw
spinal trigeminal nuclei function
afferent crude touch, pain, temperature of face.
-somatotopic!
what are the 5 major branches off of the facial nerve CN7
- temporal branch
- zygomatic branch
- buccal branch
- marginal mandibular branch
- cervical branch
what muscles are innervated by oculomotor n
superior, inferior, medial rectus, inferior oblique
what muscles are innervated by trochlear n
superior oblique
what muscles are innervated by abducens n
lateral rectus
what action happens in the eye with muscle medial rectus
adduction
what action happens in the eye with muscle superior rectus
elevation and intorsion
what action happens in the eye with muscle inferior rectus
depression and extortion
what action happens in the eye with muscle inferior oblique
extorsion and elevation
what action happens in the eye with muscle superior oblique
intorsion and depression
what action happens in the eye with muscle lateral rectus
abduction
ventral posterior lateral nucleus (VPL)
info being relayed
Somatosensory (spinal cord)
ventral posterior lateral nucleus
where does it send its info
primary sensory cortex
ventral posteromedial nucleus
info being relayed
somatosensory (CNs)
ventral posteromedial nucleus
where does it send to
primary sensory cortex
lateral geniculate nucleus
info being relayed
vision
lateral geniculate nucleus
where does it send to
primary visual cortex
medial geniculate nucleus
info being relayed
auditory
medial geniculate nucleus
where does it send to
primary auditory cortex
ventral lateral nucleus
info being relayed
cerebellum and basil ganglia
ventral lateral nucleus
where does it send to
primary motor cortex, premotor and supplementary motor cortex
ventral anterior nucleus
info being relayed
cerebellum and basal ganglia
ventral anterior nucleus
where does it send to
primary motor cortex, premotor and supplementary motor cortex, frontal lobe
mediodorsal nucleus
info being relayed
limbic, basal ganglia
mediodorsal nucleus
where does it send to
frontal cortex
anterior nucleus
info being relayed
maxillary body and hippocampus
anterior nucleus
where does it send to
cingulate gyrus
what are the cutaneous mechanoreceptors
- free nerve endings
- messier corpusles
- merkel cells
- ruffini endings
- pacinian corpuscles
free nerve endings
temperature, pain , crude touch
-small or large receptor fields
meissner corpusles
light tough
-small receptor fields
merkel cells
light touch
-small receptor fields
ruffini endings
vibration, pressure, stretching of skin (helps provide secondary info)
-large receptor fields
pacinian corpuscles
vibration, pressure
-large receptor fields
by what structures does the body detect proprioceptive changes?
- muscle spindles
- golgi tendon organs
- joint receptors
how do muscle spindles detect proprioceptive changes?
- Run parallel to muscle belly
- Intrafusal fibers
- detect rate and degree of stretch
how do golgi tendon organs detect proprioceptive changes?
- Near muscle-tendon junction
- Monitors tension within tendons
how do joint receptors detect proprioceptive changes?
Monitors stretch in synovial joints and sends info to cerebellum and spinal reflex arcs
pacinian joint receptors detect…
AROM
ruffini joint receptors detect….
indicate end range and PROM
free nerve endings in joint receptors detect…
pain from joint inflammation
what nuclei are in the lateral nuclear group
- ventral posterior lateral nucleus
- ventral posteromedial nucleus
- lateral geniculate nucleus
- medial geniculate nucleus
- ventral lateral nucleus
- ventral anterior nucleus
which nuclei are in the medial nuclear group
mediodorsal nucleus (MD)
which nuclei are in the anterior nuclear group
anterior nucleus
what information does the dorsal spinocerebellar tract relay
afferent info regarding LE limb movements
- subconscious perception from intrafusal and joint receptors
what information does the cuneocerebellar tract relay
afferent info regarding UE/neck limb movements
- subconscious perception from intrafusal and joint receptors
what information does the ventral spinocerebellar tract relay
info regarding activity of LE spinal cord interneurons from intrafusal fibers and GTOs
what information does the rostral spinocerebellar tract relay
info regarding activity of UE/neck spinal cord interneurons from intrafusal fibers and GTOs
what are the cerebellar input pathways
- dorsal spinocerebellar tract
- cuneocerebellar tract
- ventral spinocerebellar tract
- rostral spinocerebellar tract
what are sound waves
alternating high and low pressure regions in air that originate from vibrating object
what is pitch
frequency of sound waves
define loudness
intensity/amplitude of sound waves
define tone
pitch + amplitude
Lateral nucleus
output
output to cerebellum and to lateral vestibulospinal tract to facilitate extensors
(posture, muscles of trunk and legs)
medial nucleus
output
provides descending output ot muscles of head and neck via MLF
(MLF, head position)
superior nucleus
output
provides ascending output via MLF to oculomotor nuclei
inferior nucleus
output
outputs to cerebellum to the reticular formation and to the oculomotor nuclei
