lecture 16: CN V and VII Flashcards
what are the 3 divisions of the trigeminal n
opthlamaic
maxillary
madinbular
is trigeminal mixed, sensory or motor
mixed
where does the trigeminal n emerge from the pons
lateral aspect of the pons
what is the only branch of the trigeminal n that carries motor fibers
only C V3 (mandibular)
true or false: only the only C V3 (mandibular) carries sensory fibers
false, motor fibers
in the trigeminal n, most primary sensory neurons cell bodies (pseudounipolar) are located where
in trigeminal ganglion
where is the trigeminal ganglion located
near pons
what is the dermatome distribution of the opthlamaic n
cornea, skin of forehead, scalp, eyelid, anterior nose, anterior nasal cavity mucosa, mucosa of paranasal sinuses
what foramen foes the ophthalmic n exit thru
superior orbital fissure
what foramen foes the maxillary n exit thru
foramen rotundum
what foramen foes the mandibular n exit thru
foramen ovale
what is the dermatome distribution of the maxillary n
skin of the face over maxilla (upper lip, cheek), maxillary teeth, posterior nasal cavity mucosa, maxillary sinus and palate
what is the dermatome distribution of the mandibular n
skin of the face over the mandible and sides of face, mandibular teeth, temporomadinular joint, oral mucusa, anterior 2.3 of tongu
what is the innervates the masseter
opthlamaic n
what is the innervates the termporalis
maxillary
what is the innervates the medial and lateral pteryhoids
mandibular
what muscle does the ophthalmic n innervate
masseter
what muscle does the maxillary n innervate
temporalis
what muscle does the mandibulary n innervate
medial and lateral pterygoids
true or false: all 3 divisions of the trigeminal n carry all somatosensory modalities
true
what are the two trigeminal n nuclei
sensory trigeminal n (somatic sensory)
motor trigeminal nucleus (brainchian motor)
what are the 3 parts of the sensory trigeminal nucleus
mesencephalic nucleus (midbrain/pons), chief nucleus (pons), spinal nucleus (pons to c3)
the sensory trigeminal nucleus extends from where to where
midbrain to upper cervical spine
where is the mesencephalic nucleus (of sensory trigeminal nucleus) located
midbrain/pons
where is the chief nucleus (of sensory trigeminal nucleus located )
pons
true or false: the chief nucleus carries only branchial motor
false, sensory info
where is the spinal nucleus (of sensory trigeminal nucleus) located
(pons to c3)
spinal trigeminal nucleus receives what type of info
pain and temperature (spinothalamic pathway)
the spinal nucleus of the trigeminal n is continuous with BLANK in the spinal cord
dorsal column (since spinothalamic info is thru dorsal horns)
the spinal trigeminal tract is continuous with what in the spinal cord
dorsolateral tract
what is the function of the spinal trigeminal tract
acts as an elevator to allow information/axons to ascent or descent
what somatosensoation does the spinal nucleus receive
pain and temperate
what somatosensoation does the chief sensory nucleus receive
rfine touch and vibration (DCML)
true or false: the chief nucleus receives rfine touch and vibration (DCML)
true
true or false: the trigeminal tract only carries information from the spinal nucleus
fALSE, from all 3 trigeminal sensory nuclei
what information does the mesenphealic nucleus receive
non concious proprioception
what pathway is the mesencephalic nucleus equivalent to
spinocerebellar pathway
why is the mesephalic nucleus unique
since it contains cell bodies of primary sensory neurons (only knwoncause of primary sensory neurones with cell bodies in CNS)
most primary sensory neuron cell bodies of the trigeminal n are located in the trigeminal ganglion, except what exception
mesencephalic nucleus
contains cell bodies of primary sensory neurons (only knwoncause of primary sensory neurones with cell bodies in CNS)
be able to locate the different sensory and branchial motor nuclei i the brainstem
where is the motor trigeminal nucleus located
in the pons at the level where CN V emerges
why is the motor trigeminal nucleus considered branchial motor
since the muscles of mastication are derived from pharyngeal arches which lead to branchial motor (not somatic)
explain the ascending trigeminal pathway carrying fine touch, vibration and concious proprioceptions
1) primary sensory neuron in trigeminal ganglion
2) synapse with secondary sensory neuron in the chief nucleus of CN V
3) decussation
4) ascends in trigeminal nucleus
5) synapse with tertiary sensory neuron in the VPM of thalamus
6) internal capsule (genu)
7) to primary somatosensory cortex in most lateral area for head and neck
the trigeminal ganglion for fine touch vibration is equivalent to what in the DCML pathway
dorsal root ganglion
the chief nucleus of the CN is equvileant to what in the DCML
dorsal horn
fine touch vibration and concious proprioception of trigemianl ascending pathway ascends as trigeminal leminscus is analogous to what in the DCML
medial lemiscus
what is the equivalent to the medial lemniscus in the trigeminal ascending pathway for fine touch, vibration etc
trigeminal leminscus