brainstem - internal anatomy of medulla Flashcards
the medulla connects the _____ and the _______
pons sup and cervical SC inf
medulla is _____ in shape and ______ superiorly
conical shape and broad superiorly
what does the cervicomedullary junction contain
pyramidal decussation
cervicomedullary junction is level c ______
foramen magnum
the central canal continues upward into ______ and expands as ______
lower half of medulla
cavity of 4th vent
what can be found in the ventral surface of the medulla in general
anterior median fissure
pyramids
anterior external arcuate fibers
olives
the anterior median fissure is cont c ______
anterior median fissure of SC
swelling on each side of median fissure
pyramids
the pyramids are bounded lat by _____
ventrolateral sulcus
the pyramids carry ______
ant/lat corticospinal tracts to SC
corticobulbar fibers in brainstem
Emerge from the anterior median fissure and
anterior external arcuate fibers
anterior external arcuate fibers pass laterally over the _____ to enter the ______
surface of medulla
enter cerebellum
anterior external arcuate fibers arise from ______
arcuate nuclei at base of medulla
arcuate nuclei at base of medulla pass around the _____ to enter ______
lateral surface
inferior cerebellar peduncle
olives are _____ to pyramids
posterolateral
olives are Oval elevations produced by underlying _____
inferior olivary nuclei
________ emerge from groove bet pyramids and olives
rootlets of hypoglossal nerve
roots that emerge from the olives
Roots of glossopharyngeal, vagus, and rootlets of accessory nerves
_____ are posterior to olives
Inferior cerebellar peduncles
inferior cerebellar peduncles connect ______
connect medulla to cerebellum
CN from lat olive
9,10,11
CN from medial to olive and lat to pyramid
12
Posterior surface of the superior of the medulla forms the _____
lower part of the floor of
the 4th ventricle
Posterior surface of the inferior half of the
medulla is continuous with
posterior aspect
elongated swelling of the posterior median sulcus
gracile tubercle
what produces gracile tubercle
gracile nuc
found lateral to gracile tub
cuneate tub
what produces cuneate tubercle
cuneate nuc
4 levels of internal structure of medulla
pyramidal decuss
decuss of lemnisci
level of olives
level just inferior of pons
Superiorly, the corticospinal fibers ______
occupy and form the pyramid