(16) Sensory CNs: I, II, V, VII, IX, X Flashcards
pathway taken by signals from sensory receptors in the nasal epithelium on their way to the cortex.
through cribiform plate to olfactory bulb down olfactory tract to synapse in olfactory cortex (temporal lobe?), amygala, and related forebrain structures
term for loss of smell
anosmia
the optic N is made of of axons of ….
retinal ganglion cells
the optic tract runs along the outside of the
mesencephalon
Once entering the optic tract what are the 2 paths sensory fibers can take?
laternal geniculate body then to primary visual cortex
brachium of the superior colliculus (for visual startle reflex)
receives epicritic inputs from afferents for fine touch and vibrational sense of the face
chief sensory nucleus
where to the epicritic afferents in the trigeminal nerve have their cell bodies?
trigeminal ganglion (which is found outside the brainstem)
contains the cell bodies of proprioceptive afferents from the muscles of mastication
mesencephalic nucleus of CN V
where is the mesencephalic nucleus found?
tegmentum of mesenchepalon
what nucleus contians the cell bodies of afferents that carry pain and temp info from the face
spinal nucleus of V
the spinal nucleus of V is continuous with ___ inferiorly
substantia gelatinosa (lamina I and II)
runs from the chief sensory nucleus of V to the VPM
trigeminal lemniscus
runs from the spinal nucleus of V to the VPM
trigeminothalamic tract
what is the somatotrophic organization of fibers within the spinal nucleus of V
ventral → dorsal
V1, V2, V3, VII, IX, X
sensory functions of CN VII
taste on and 2/3 of tongue and touch, pain, tenp for the small area around the external auditory meatus
