Pons Flashcards
Length of pons
2.5 cm
long
Pons connects … to …
Medulla oblongata
Mid breain
largest part of the brainstem
The pons
Pons is a group of nerves that function as
connecting the right and left cerebellar hemispheres
The pons develops from
embryonic metencephalon
The pons is located in
the anterior part of the posterior cranial fossa.
Its anatomical relations post, inf, superior
Posteriorly – the cerebellum, separated by the fourth ventricle.
Inferiorly – the medulla oblongata.
Superiorly – the midbrain lies immediately above the pons.
The anterior or ventral surface of the pons is marked by a bulging formed by
the transverse pontocerebellar fibres.
basilar artery is located.
The basilar groove
The pontomedullary junction is an important anatomical landmark defined by
the angle between the lower border of the pons and the superior border of the medulla.
the angle between the lower border of the pons and the superior border of the medulla.
Cranial nerve V: trigeminal
Cranial nerve VI: abducens
Cranial nerve VII: facial
Cranial nerve VIII : vestibulocochlear
VIII: vestibulocochlear origins
laterally to the facial nerve.
VII: facial originates from
the cerebellopontine angle, the more lateral aspect of the pontomedullary junction.
nerve VI: abducens – originates from
the pontomedullary junction, close to the midline
nerve V: trigeminal – originates from
the lateral aspect of mid pons
The pons is intimately related to the cerebellum and is connected to it by
middle cerebellar peduncles
….. marks the midline of the floor of the fourth ventricle
The medial eminence
The facial colliculus
bulging formed by the fibres of the facial nerve looping around the abducens nucleus.
parts anatomy
Pontine cistern
Clivus
Anterior surface parts anatomy
Pyramidal eminince Transverse pontine fibers Mid cerebral peduncle Basilar groove Motor root of trigeminal n Sensory root of trigeminal n
External appearances of pons
Trigeminal n Medullopontine sulcus Facial n Abduncens n Vestibulocochlear n Intermediate n
Post surface of pons forms
Forms the upper half rhomboid fossa
and is triangular in shape
The thin white membrane on the post surface of pons
Superior (anterior) medullary vellum apex
Facial colliculus
Root of facial nerve winding around the nucleus of abducens nerves
Post surface of pons
Post median sulcus Sup cerebral peduncle Sup medullary velum Sulcus limitans Median eminence Facial colliculus Vestibular area Lateral recess Foramen lateral VESTIBULAR AREA Auditory tubercle
