Midbrain Flashcards
What structures does midbrain connect?
Connects pons and cerebellum with forebrain
This structure travels through the midbrain and is filled with csf?
Cerebral aqueduct
Anterior part of midbrain?
Crux cerebri
Posterior part of midbrain?
Tegmentum
Crus cerebri and tegmentum are divided by?
Substantia nigra
Midbrain located between?
Diencephalon and pons
This connects 3rd and 4th ventricles?
Aqueduct of sulvius
Area behind aqueduct of sylvius termed?
Tectum
Tectum made of what structures?
Corpora quadrigemmina.
2 superior colliculi
2 inferior colliculi
Function of superior colliculi?
Controls reflex movement of the eyes, head and neck in response to vision.
Are connected by the superior brachium to lateral geniculate body
Function of inferior colliculus?
Control reflex to auditory stimuli.
Connected by inferior brachium to medial geniculate body.
What cranial nerves emerge below inferior colliculis?
Trochlear nerve.
Depression in the middle of anterior portion of midbrain?
Interpenduncular fossa
Interpenduncular fossa has what structures bounding it?
Crus cerebri
Where does occulomotor nerve emerge from?
Medial side of crus cerebri
Midvrain consists of two lateral halves names?
Cerebral peduncles.
What surrounds the cerebral aqueduct?
Periaqueductal grey matter.
Ependymal cells.
Inferior colliculus recieves fibres from?
Lateral lemniscus
The trochlear nerve emerges posterior to?
Medial longitudinal fasciculus
The fibers of trochlear nerve dessucate where?
Superior medullary velum.
Lateral to cerebral aqueduct?
Mesencephalic nucleus of trigemminal nerve
Central part of tegmentum in front of cerebral aqueduct?
Dessucation if superior cerebellar peduncles
Lateral to dessucation of superior cerebellar peduncles?
Reticular formation.
Posterior to substantia naigra?
Medial lemniscus