Medulla Flashcards
Medulla connects
Pons and spinal cord
The junction of the medulla and spinal cord is located
At the foramen magnum. Where posterior and anterior roots of the first cervical spinal nerve originates
The central cavity of the spinal cord expands in the medulla as
Cavity of the 4th ventricle
Depression on Anterior surface of medulla
Anterior median fissure
On each side of anterior median fissure
Pyramids
What are the pyramids made of?
Bundles of nerve fibers, corticospinal fibers originating from precentral gyrus of cortex
The bundle fibers in pyramid taper inferiorly and cross over to form
Decussation pf pyramids
Emrgimg from the anywrior median fissure above the decissation
External arcuate fibers
Posteolateral to the pyramids
Olives produced by inferior olivary nuclei
Posterior to olives
Inferior cerebellar peduncles
Cranial nerve in the groove between olive and inferior cerebellar peduncles
Glossopharyngeal
Vagus
Accessory nerve
GAV
Posterior surface of superior half of the medulla oblongata forms
Floor of 4th ventricle
Posterior surface of inferior half of the medulla is continous with
Posterior aspect of spinal cord
Depression on posterior part of medulla
Posterior median sulcus
On each side of median sulcus
Gracile tubercle
Cuneate tubercle
This structure cause extensive lateral spread of white and grey matter
Fourth ventricle
Internal structure of medulla considered at
Level of decussation of pyramids
Level of decussation of lemnisci
Level of olives
Level inferior to pons
Corticospinal tract descends into whit matter in spinal cord as
Lateral corticospinal tract
Decussation of lemnisci
The great sensory decussation
Where is decussation of lemnisci located
Anterior to central grey matter and posterior to the pyramids
The lemnisci are formed from
Internal arcuate fibres emerging from nucleus gracialis and cuneatus
