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34 Cards in this Set

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  • Back
what is located in the tegmentum?
- cranial nerve nuclei
what cranial nerve is in the pons? which ones are at the pons/medullary junction?
- V is in the pons

- VI, VII, VIII from medial to lateral are @ pons medullary junction
what cranial nerves does the corticobulbar pathway not synapse on? which nerve is it not bilateral in?
- does not syanpse on III, IV, Vi

- not bilateral in VII
what is spinal nucleus V for?
- pain & temperature for face & head
what is the medial lemniscus formed from?
- formed by axons of 2nd order neurons from cuneatus & gracilis

- internal arcuate fibers from these form cross and synapse & allow this to ascend into thalamus
what does dorsal motor X hold?
- cell bodies of all parasympathetics to body except pelvis
what does nucleus solitarius have? what cranial nerves is it receiving input from?
- information about taste & sensory - information from viscera

- receiving input from VII, IX, X
what is the inferior cerebellar peduncle?
- major communication between medulla & cerebellum

- receives input from medulla & spinal cord
where does the nucleus ambiguus receive input from?
- receives input from the IX & X

- lesion would lead to hoarseness, difficulty swallowing
what happens to pain & temp in face with lateral medullary lesion?
- ipsilateral loss of pain & temperature because of descending nucleus of V
what does the middle cerebellar pudencle do?
- brings information from cortex into cerebellum
what does the sueprior cerebellar pudencle do?
- output pathway from cerebellum
where are the vestibular & cochlear nuclei in relationship to the inferior cerebellar peduncle?
- vestibular is medial

- cochlear is lateral hanging over inferior cerebellar peduncle
_______ ganglion is where cell bodies are for cochlear nerve. _______ ganglion is where cell bodies are for vestibular nerve.
- spiral ganglion

- vestibular ganglion
how is auditory information processed?
- information from cochlear nucleus crosses midline in trapezoid body

- ascends in lateral lemniscus --> inferior colliculus --> medial geniculate --> auditory cortex
what is lateral lemniscus for?
- for ascending autditory information to get to inferior colliculus --> medial geniculate --> auditory cortex
what happens to your hearing if you have a lesion in the cortex?
- will still be getting information from cortex will just be harder to localize the sound

- if hurt CNVII will be deaf in one ear
what is the facial colliculus?
- formed from fibers of the facial nerve as they loop around VI

- bulge in caudal pons into the 4th ventricle
what is the pontine nuclei?
- descending fibers from the cortex synapse here

- transmits information from the cortex to the cerebellum
pontine nuclei send their fibers up from the pons to the cortex forming the what?
- the middle cerebellar penducle
lateral gaze requires coordination of the extraocular muscles. Communication between CNVI & CN III is provided via what?
- the MLF (medial longitudinal fasciculus)
what does the medial longitudinal fasiculus do?
- provide communcation between CN VI & III
what does PPRF do for lateral gaze?
- tells the abducens nerve to contract at same time sends signal across midline to CN III so opposite eye will turn medially

- fiber going to other eye is provided by MLF (medial longitudinal fasciculus)
how are neurons that control upper vs lower facial expression controlled?
- neurons that control upper face receive bilateral corticobulbar innervation

- neurons that control lower face receive only contralateral innervation
a lesion of the corticobulbar tract does what the the face? lesion of CNVII?
- lesion of corticobulbar tract results in paralysis of contralateral lower face (UMN)

- lesion of facial nucleus or CNVII results in ipsilateral facial paralysis (LMN)
what part of the pons does the trigeminal nerve enter?
- enters at mid-pons

- have principal sensory & motor V
what is the only known nucleus that contains primary sensory neurons in the brainstem?
- mesencephalic nucleus of V
where is the nucleus of CN V located?
- found throughout the brainstem
what are the different aspects of the nuclei of CN V?
- principal sensory relays touch, position, vibration

- spinal V relays pain & temperature

- motor V innervates muscles of mastication
what does the mesencephalic nucleus of V do?
- has processes that head out to the muscles of mastication & have central processes that head back to motor nucleus of 5

- primary neurons that sense what is going on in muscles of 5
what does spinal V do?
- heads down from the pons to the medulla & synapses in 2nd order neurons in spinal trigeminal nucleus

- 2nd order neurons cross the midline and head up in the trigeminothalamic pathway

- this is brining pain & temperature
how does the principal sensory nucleus of V travel?
- in the pons, carries touch, vibration, pressure

- uses 2nd order neurons to cross the midline & heads up int he trigemino-thalamic tract (some head up on same side called dorsal trigeminothalamic pathway - some cross over)
how does the motor pathway of V work?
- primary fibers in mesencephalic going out to muscles of mastication & central process heading up to nucleus of V to control bite
what would be affected in a medial pontine lesion? what happens in lateral?
- corticospinal & corticobulbar pathways

- VI fibers because they exit medially

- in lateral VII could be affected