PONS Flashcards
Where is the basilar artery located
pontine sulcus with protuberance
dorsal portion of the pons
rostral floor of the ventricle
nerve fiber bundles in the basis pontis
CST, CBT, CPCerebellar
largest group of fibers in the basis pontis.
CPCerebellar
somatotopic arrangement of corticopontocerebellar system
the prerolandic cortex: medial pontine nuclei,
the postrolandic cortex (primary somatosensory cortex): lateral pontine nuclei,
the arm area of the sensorimotor cortex to dorsal pontine nuclei,
and the leg area to ventral pontine nuclei
T or F, The pontocerebellar projection is primarily crossed
T
the pontocerebellar projection is somatotopically organized, with the caudal half of the pons projecting to the _____lobe of the cerebellum and the rostral half projecting to the ________ lobe.
anterior, posterior
Contains the pontine protuberance
Basis pontis
phylogenetically older part of the pons and is composed largely of the reticular formation
tegmentum
basal part of the tegmentum lies the specific sensory lemniscal system, which includes the
medial lemniscus, trigeminal lemniscus, and spinotha-lamic tract.
Intermingled with the ascending fibers of the lemniscal system are transversely oriented fibers of the ________
trapezoid body
Dorsal to the medial lemniscus
CTT
_______retain the same dorsal and paramedian positions they occupied in the medulla and pons just beneath the floor of the fourth ventricle
medial longitudinal fasciculus and the tectospinal tract
ventral spinocerebellar tract enters the ________ to reach the cerebellum.
superior cerebellar peduncle
Lesions involving the___________in the tegmentum and __________ are associated with the syndrome of anosognosia for hemiplegia in which the patients are unaware of their motor deficit
pontine reticular nuclei
corticospinal fibers in the basis pontis
neuromelanin-containing catecholamine neurons and is a synaptic station for gustatory (taste) pathways. It is also believed to play an important role in autonomic regulation,
parabrachial nucleus
division of parabrachial nucleus
lateral and medial segments
Between the spinal lemniscus, brachium conjunctivum, and medial lemniscus
parabrachial pedunculopontine nucleus.
The pedunculopontine nucleus’ function:
is the brain stem control center for somatic motor and cognitive behaviors, including locomotion, motor learning, and the reward system
pedunculopontine nucleus hormones:
cholinergic and glutamatergic.
Larger division of vestibule-cochlear
cochlear
Second-order neurons from the cochlear nuclei course through ___________
the tegmentum of the pons
Three acoustic striae
dorsal, ventral, and intermediate.
largest striae
ventral
Functions of the superior olivary complex include:
(1) processing of cochlear signals via the ascending auditory pathway, (2) detection of interaural sound intensity, and (3) providing feedback control of cochlear mechanism through the olivocochlear bundle.
The auditory projection (auditory radiation) from the medial geniculate body to the primary auditory cortex traverses the : ___________
sublenticular portion of the internal capsule.
