Brainstem and cranial nerves Flashcards
What cranial nerves emerge from the midbrain?
Cranial nerves III and IV emerge at this level.
What cranial nerves emerge from the pons?
Cranial nerves V, VI, VII & VIII.
What cranial nerves emerge from the medulla?
Cranial nerves IX, X & XII emerge from medulla.
What tract are cranial nerves part of?
Corticobulbar.
Where does corticobulbar tract teminate?
Medulla.
What makes up the cerebral peduncles?
Corticospinal and corticobulbar tract.
Where are the cerebral peduncles?
Anterior portion of midbrain.
What do cranial nerves do once they emerge from corticobulbar tract?
Synapse with nuclei. Neurones from nuclei then go on and innervate structure in head, face, tongue and neck.
Which motor pathway has fibres which cross in the medulla?
Corticospinal.
What occurs at pyramidal decussation?
Corticospinal nerve fibres cross over.
Where are the descendings tracts in the medulla?
Medullary pyramids (anterior surface of medulla).
Where are the dorsal columns in the medulla?
Posterior surface of medulla.
Anterior CNS blood supply?
Internal carotid system
Posterior CNS blood supply?
Vertebrobasilar
What blood vessels supply the brain stem?
Vertebrobasilar vessels.
