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73 Cards in this Set

  • Front
  • Back
The pons are derived from the
rhombencephalon and later metencephalon
pontine nuclei are _______derived, but migrate ventrally
alar plate
Motor nuclei of the pontine tegmentum are derived from?
basal plate
Pontinine tegmentum contains
1. Rostral Continuation of hte reticular formation
2. CN nuclei
3. Ascending tracts
Basilar Pons contain
1. Corticospinal and Corticobulbar Tracts
2. Pontine Nuclei
3. Middle Cerebellar Peduncle
Pontomedullary Junction contains nuclei for which CNs?
CN 6, 7, 8
Nuclei of CN VIII at the PMJ include the dorsal and ventral cochlear nuclei that recieve acons from the
cochlear spiral gangion
axons from teh spiral ganglia of the cochlea carry auditory information to the
brainstem
Brainstem neurons contacted by auditory axons are located in
Dorsal Cochlear Nucleus
Ventral Cochlear Nucleus
Axons from the dorsal and ventral cochlear nuclei mostly cross the midline in the
trapezoid body
What is the origin of the efferent cochlear bundle?
Superior Olivary Nucleus
the primary auditory cortex is in the
transverse gyri of Heschel
what is responsible for sound dampening via CN VII
superior olivary nucleus
what tract carries sound?
lateral lemniscus
lateral lemniscus ascends bilaterally with a ______ predominance
contralateral predominance
would a monoaural hearing loss occur with a brainstem lesion beyond the cochlear nuclei ?
NO
Vestibular component of CN VIII includes 4 nuclei, what are they?
Medial
Lateral
Superior
Inferior Nuclei
The vestibular nuclei receive input from the
vestibular apparatus
vestibular nuclei sends projects to?
1. Cerebellum
2. Occuluomotor nuclei
3. Thalamus
4. Spinal Cord
vestibular nuclei sends projects to what part of the cerebellum
Flocculonodular lobe and deep cerebellar nuclei
(via juxtarestiform body) for balance corrdination
vestibular nuclei sends what type of information to the thalamus
conscious perception of equilibrium and orientaion
vestibular nuclei sends projects to the spinal cord via what tracts
medial and lateral vestibulospinal tracts
medial vestibulospinal tracts carry what information
inhibitory to neck and upper trunk muscles
lateral vestibulospinal tract relays what type of information?
excitatory to extensory spinal alpha motoneurons
The caudal Pons contains nuclei for CNs at the pontomedullary junction
VI and VII
Facial Motor Nucelus innervates
Muscles of facial expression
stylohyoid
posterior belly of digastric
stapedius (sound dampening)
what is the internal genu of facial nerve?
Motor portion of CN 7 loop around the nucleus of CN 6 and then exits ipsilaterally
Facial Colliculus
the bump on the floor of the 4th ventricle showing the presence of the abducens nucleus and the axons of the 7th nerve surrounding it
CN 7 SVA fibers supply
Taste from anterior 2/3 of tongue and hard and soft palates via geniculate ganglion
Abducens Nerve exits in the
inferior pontine sulcus
CN6 innervates
ipsilateral lateral rectus muscle of the eye
what nucleus lies under the facial colleculus?
CN 6
Neurons located in abducens nucleus lie beneath the
axons of the facial nerve in the facial colliculus
one of the most frequently injured CNs
Abducens
Abducens nerves has complex central connections with ______ nuclei
oculomotor nuclei
Pontine reticular formation in the
pontine tegmentum
This tract between CN III and VI that carries information to coordinate eye movement is
the medial longitudinal fasciculus
The corticospinal and corticonuclear (bulbar) tracts run through the
substance of the basilar pons
Inferior cerebellar peduncle includes
vestibulocerebellar projections
The Inferior Cerebellar Peduncle includes vestibulocerebellar projections called the
juxtarestiform body
Blood supply to the pontomedullary junction and caudal pons is from
vertebral arteries
Basilar artery
PICA
AICA
what branches of the basilar supply ventral and medial caudal pons?
vertebral and medial branches
Corticonuclear innervation is
bilateral with a controlateral predominance
Sensations carried (trigeminal ganglia) include both ____ and ____ sensations
epicritic and protopathic sensation
what are the 3 brainstem nuclei that receive information from the trigeminal ganglion
1. Spinal Nucleus of 5
2. The principal Sensory Nucleus
3. Mesencephalic neucleus
spinal nucleus of 5 extends from
CN5 entry to C2-C3
spinal nucleus carries mostly ____ sensation
protopathic sensation
what are the 3 divisions of the spinal nucleus?
1. Pars Oralis
2. Pars Interpolaris
3. Pars Caudalis
Pars Interpolaris carries
touch and some pain and temperature to the teeth
Pars Caudalis
pain and temperature to the face
The principle sensory nucleus is located at the level of
trigeminal nerve entry
The principle sensory nucleus receives what type of sensation? and from where?
epicritic sensation from the face
Mesencephalic nucleus extends from ____ to ____
Rostally from the level of CN5 entry up to the caudal midbrain
Mesencephalic nucleus receives
proprioception information from the muscles of mastication and the reflex control of bite pressure
all three brainstem nuclei of CN 5 send central projections to the
thalamus
the ventral trigeminal tract is formed from what nucleus?
spinal trigeminal nucleus (lower brainstem) and the principal sensory nucleus (contributes at higher levels)
the ventral trigeminal tract is ipsilateral or controlateral?
controlateral
the dorsal trigeminal tract is formed from what nucleus?
the principal sensroy nucleus and appears related primarily to the mandibular division
Is the dorsal trigeminal tract ipsilateral or controlateral?
Bilateral but largerly ipsilateral
which major tract in the mid pons is located in ventral (basilar)pons?
Corticospinal and Corticonuclear tracts
which major tract in the mid pons is located in at the top of the pontine nuclei and has twisted to a medal to lateral orientation (legs lateral)?
Medial Lemniscus
which major tract in the mid pons is located near the lateral edge of hte tegmentum near the lateral edge f hte medial lemniscus?
Anterolateral Tracts
which major tract in the mid pons is located just dorsal to the medial lemniscus?
Ventral and Dorsal Trigeminothalamic Tracts
which major tract in the mid pons is located at the lateral edge near the anterolateral system?
the lateral lemniscus
what forms the lateral border of the tegmentun at the mid pons level?
middle cerebellar peduncle
what forms the roof of the 4th ventricle at the level of the mid pons?
superior cerebellar peduncles and superior medullary velum
the rostral pons near the midbrain is hte narrowest portion of the brainstem is called the
isthmus
the upper pons is supplied by
branches of the basilar arteries and at upper levels the superior cerebellar arteries
what branch supplies the medial pontine tegmentum?
Paramedian Branch
what branch supplies the lateral pontine tegmentum
short circumferential branches
what branch supplies the upper and dorsolateral pons
long circumferetial branch
The tract between CNs 3 and 6 that carries information to coordinate eye movement is
the medial longitudinal fasciculus
Neurons located in the pons connect to ____ via the ____
cerebellum via middle cerebellar peduncle