Pons
Encyclopedia : P : PO : PON : Pons
Brain: Pons Position of the pons in the human brain
|- style="text-align: center;" class="hiddenStructure"
| colspan="2" |
|- style="text-align: center; line-height: 1;" class="hiddenStructure"
| colspan="2" |Coronal section of the pons, at its upper part.
|- class="hiddenStructure"
|Latin pons
|- class="hiddenStructure"
|[subject #187 ]
|- class="hiddenStructure"
|Part of
|colspan="2"|
|- class="hiddenStructure"
|Components
|colspan="2"|
|- class="hiddenStructure"
|Artery
|colspan="2"|
|- class="hiddenStructure"
|Vein
|colspan="2"|
|- class="hiddenStructure"
|Acronym(s)
|colspan="2"|
|- class="hiddenStructure"
|NeuroNames [hier-538 ]
|- class="hiddenStructure"
|MeSH [A08.186.211.132.810.428.600 ]
|- class="hiddenStructure"
|Dorlands/Elsevier [/ ]
|}
For other uses, see Pons (disambiguation)}}}.
pons (sometimes pons Varolii after Costanzo Varolio) is a structure located on the brain stem . It is rostral to the medulla oblongata , caudal to the midbrain, and ventral to the cerebellum . In human s and other biped s this means it is above the medulla, below the midbrain, and anterior to the cerebellum. It is part of the autonomic nervous system , and relay s sensory information between the cerebellum and cerebrum . Some theories posit that it has a role in dream ing.
Anatomy of the pons
The "knob-like" process is 2 centimeters long and located on the anterior (front) of the brainstem. It is formed by transverse pontine fibres that travel from one side (left or right) to the other. Most other fibres in the brainstem travel up and down.
The posterior (back) surface of the pons forms part of the wall of the fourth ventricle of the brain.
Most blood to the pons is supplied by pontine arteries . These are small arteries that branch off the basilar artery (of the Circle of Willis ). Blood also comes from the anterior inferior, and superior cerebellar arteries.
Cranial nerve nuclei
A number of cranial nerve nuclei are present in the pons. The chief or pontine nucleus of the trigeminal nerve sensory nucleus, as well as the motor nucleus for the trigeminal nerve, are present in the mid-pons.
The abducens , vestibulocochlear , and facial nerve nuclei are present slightly lower down in the pons.
External links
Rhombencephalon
MYELENCEPHALON /MEDULLA arcuate nucleus of medulla , solitary nucleus , hypoglossal nucleus , nucleus ambiguus , olivary body , cuneate nucleus , accessory cuneate nucleus , gracile nucleus , inferior salivatory nucleus , nucleus raphe obscurus , nucleus raphe magnus , nucleus raphe pallidus , area postrema
METENCEPHALON /CEREBELLUM :cerebellar vermis , flocculus , arbor vitae
METENCEPHALON /PONS :pontine tegmentum , superior salivary nucleus , trapezoid body , pontine nuclei (superior olivary nucleus , trigeminal nerve nuclei , abducens nucleus , facial motor nucleus , cochlear nuclei , vestibular nuclei ), locus ceruleus , paramedian pontine reticular formation , nucleus centralis superior
FOURTH VENTRICLE :obex , median aperture
From Wikipedia , the Free Encyclopedia. Original article here . Support Wikipedia by contributing or donating .GNU Free Documentation License See Wikipedia Copyrights for details.
