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Basic Brainstem Anatomy

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Sagittal midline anatomy, focusing on the brainstem.

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The medulla separated from the pons

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by the pontomedullary sulcus.

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Another little dippity do, or sulcus,

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can be seen at this protrusion here,

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which is a landmark known as the medullary clava,

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where the proprioceptive nuclei will synapse.

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Anteriorly, in the medulla,

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will be the location of the pyramids

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and the motor tracks.

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As we ascend, we reach the level of the pons

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with the pontine belly.

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The floor of the fourth ventricle.

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Here's the fourth ventricle with the fastigium of the

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fourth, there's the inferior recess of the fourth,

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there's the superior recess and the aqueduct of Sylvius.

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And the facial colliculus bump sits on the floor

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of the fourth ventricle, not easily seen here.

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As we move up to the level of the midbrain,

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separated by the ponto midbrain sulcus,

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we see the inferior colliculus,

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the superior colliculus,

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the posterior commissure and the aqueduct of Sylvius.

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Anteriorly, we've got the mammillary body,

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the interpeduncular cistern,

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through which the third nerve will be seen

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exiting on higher resolution imaging.

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And we'll show it to you separately in the cranial

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nerve section. If you look very carefully,

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you can see a little white structure ascending

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from the region of the mammillary body.

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And this is known as the Mammillothalamic tract.

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That concludes a brief discussion of the brainstem,

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including a little bit of the ventricular anatomy.

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There's the third ventricle sitting immediately above it.

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Let's move on.

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Pomeranz out.

Report

Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Neuroradiology

MRI

Brain

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