CN I, II, V, VII, VIII, IX, X Flashcards
Early in development, the neural tube is split into two plates…they are
Dorsal (Alar plate)
Ventral (Basal Plate)
Nuclei —- to the sulcus limitans are afferent
Dorsal
What are the names of the three nuclei for the sensory aspect of the trigeminal
Chief Sensory Nucleus (middle), Mesencephalic nucleus (rostral), Spinal nucleus (caudal)
Spinal nucleus extends as a column from the mesencephalon to the spinal cord where it is continuous with what part of the spinal cord
substantia gelatinosa
Vestibular nuclei concerned with and located where
body position, pons
Cochlear nuclei concerned with
hearing, pons
Cranial nerve 1 is sensory, motor, mixed
Sensory only
Sensory receptors for CN I reside where
nasal epithelium
Sensory receptors for CN I send very fine axons called filae through what plate to synapse where
cribiform plate to synapse in olfactory blb
Anosmia
no smell
Optic nerve is sensory only
ok
Where are the sensory receptors for CN II
Back of retina
Optic nerve made up of axons of?
Retinal ganglion cells
Optic tract, formed once optic nerves converge, runs to the LGN which is…
Lateral Geniculate Body= the visual thalamus
The LGN projects to the primary visual cortex located where
Banks of calcarine fissure in occipital lobe
Startle reflex
Nerves bypass the LGN and instead travel in an arm of the superior colliculus to synapse in the superior colliculus
Primary nerve for somesthesis in the face
Trigeminal- carry fine touch, proprioception, pain, temperature, from skin of face
Know areas of skin served by each root
ok
Back of the head is mostly innervated by
C2
Chief sensory nucleus receives
epicritic inputs from afferents for fine touch and vibration sense. Also receives some epicritic input from CN VII, IX, X
Epicritic afferents in the trigeminal nerve have their cell bodies where? Trigeminal ganglion (analogous to the dorsal root ganglion of the spinal cord)
Proprioceptive afferents from the face have their cell bodies where
Mesencephalic nucleus
Spinal nucleus of V
extends from mesencephalon to the spinal cord where it becomes continuous with the substantia gelatinosa. Receives pain and temp afferents from the face that run in CN V as well as VII, IX, X. These pain and temp afferents have their cell nuclei in the trigeminal ganglion
What connects teh chief sensory nucleus of V to the VPM….
Trigeminal lemniscus
CN VII sensory components
Taste for anterior 2/3 of tongue
Some fine touch, vibration, pain and temperature around external auditory meatus
Nucleus soltarius?
Runs as a column through the pons and medulla, rostral portions are also called gustatory nucleus and are concerned with taste sensation. Revceives input from VII, IX, X
Gustatory nucleus receives inputs from VII, IX, X
ok
Gustatory nucleus receives taste inputs from
VII- anterior 2/3 of tongue
IX- posterior 1/3
X- pharynx
caudal part of nucleus solitarius is what
cardiorespiratory nucleus
cardiorespiratory nucleus receives visceral sensory input from
glands, chemoreceptors, baroreceptors
vestibulocochlear nerve deos what
Only sensory but has 2 divisions
- Vestibular (balance and acceleration
- auditory
Auditory receptors are what
hair cells located in the organ of corti in the cochlea
hair cells in the organ of corti are sensitive to what?
airborne pressure waves that are transduced into fluid waves in the cochlea
What is tonotopic organization
depending on location in the cochlea, these receptors are tuned to different frequencies of sound
Vestibular receptors are also
Hair cells…located in saccule, utricle, and semicircular canals
Cell bodies of auditory afferents located where
spiral ganglion
Nucleus solitarius (solitary nucleus is concerned with?
rostral part is concerned with taste- CN VII, IX, X
Caudal concerned with cardiorespiratory input- CN IX,X
trigeminal lemniscus
runs from chief sensory nucleus of V to the VPM…analogous to the medial lemniscus for spinal pathways
Spinal nucleus of V to the VPM
Trigeminothalamic tract….analogous to the spinothalamic tract
Describe the s0omatopic organization of the spinal nucleus of V
Pain and temperature afferents travelling in the spinal nucleus of V travel with fibers from VII, IX, and X most dorsal, then V3, v2, and v1 in dorsal to ventral order
Cell bodies of proprioceptive afferents from muscles of mastication are located where
mesencephalic nucleus….these cells project bilaterally to the trigeminal motor nucleus to mediate monosynaptic stretch reflex of the jaw
Cell bodies for afferents of fine touch and vibration located where
trigeminal ganglion (V), geniculate VII, etc…all outside brainstem
Epicritc trigeminal nucleus
Chief sensory
Second order neurons from chief sensory travel in what to VPM
Trigeminal mensicus
Cell bodies for pain and temp in face synapse where
Spinal nucleus of V
