Pons Flashcards
Anterior part of pons
Basal part
Posterior part of pons
Pontine tegmentum
What structure divides anterior and posterior pary of pons?
Trapezoid body.
Anterior to cerebellum
Pons
Connects midbrain and medulla
Pons
Transverse collection of fibres on each side of anterior surface of pons
Middle cerebellar peduncle
Shallow groove on anterior aspect of pons.
Basilar groove. Holds basilar artery
Cranial nerve emerging on anterolateral surface of pons.
Trigeminal nerve
A pair, each with a small medial motor part and a large lateral sensory part
What cranial nerves emerge In the groove between pons and medulla
F- facial
A-Abduscens
V-Vestibulochoclear
What forms upper half of 4th ventricle?
Posterior surface of pons
The posterolateral aspect of poms blocked by
Superior cerebellar peduncles
Posterior pons divided into symmetrical halves by?
Median sulcus
Lateral to median sulcus?
Medial eminence
Lateral to medial eminence
Sulcus limitans
Inferior end of medial eminence expanded to form
Facial colliculus produce by root of facial nerve winding around nuclues of abduscens nerve
Floor of superior part of sulcus limitans
Substantia ferruginea which is dark in color due to deeply pigmnted nerve cells
Lateral to sulcus limitans
Area vestibuli
Trigeminal nuclei location in brainstem
Present in pons
Posterior to the lateral part of medial lemniscus
Facial nucleus
Location of medial longitudinal fasciculus
Beneath floor of 4th ventricle
The medial vestibular nucleus is lateral to
Abducens nucleus and close to imferior cerebellar peduncles
Lying in the anteromedial aspect of inferior cerebellar peduncles
Spinal nucleus of trigemminal nerve and its tract
What makes up trapezoid body
Fibres from cochlear nuclei
Nuclei of trapezoid body
Basilar part of pons contains
Pontine nuclei
corticopontine fibres of crus ceribri of midbrain terminate here
Axons of thee fibres give rise to transverse fibres of pons which enter middle cerebellar peduncles and forms main pathway linking cerebellum to cortex
Cranial nerves from pons
Trigeminal
Facial
Abduscena
Vestibulocochlear
Location of motor nucleus of trigeminal nerve
Beneath lateral part of 4th ventricle
Within reticular formation
Location pf sensory nucleus of trigemminal nerve
Lateral side of motor nucleus
Posterolateral to motor nucleus of trigeminal nerve
Superior cerebellar peduncle
Common at both facial and trigemmin nuclei level
Reticular formation
Fourth ventricle
Pontine nuclei
Trapezoid nuclei
Nuclei at facial colliculus
Facial nuclei Abduscens nuclei Medial vestibular nucleus Spinal nucleus of trigemminal nerve Pontine nuclei Trigemminal nuclei
Nuclei at trigemminal nucleus level
Main sensory and motor nucleus
Nucleus of trigemminal nerve
Pontine and trapezoid nuclei
Motor tracts same in facial and trigemminal levels
Corticospinal
Corticonuclear
Transverse pontine
Medial longitudianl fascicullus
Sensory tracts of facial colliculus
Spinal tract of trigeminal nerve
Lateral spinal and medial lemnisci
Sensory tracts at trigemminal level
Lateral spinal and medial lemnisci
