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Old 06-19-2011
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Neuro Tectum vs Tegmentum

I'm confused about the Tectum vs Tegementum, what is the difference and what is the clinical significance of these two areas of the brain stem?
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Old 06-19-2011
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The tegmentum is the area of the medulla that contains the cranial nerve nuclei, the nuclei of the reticular formation, the ascending tracts, and two special nuclei, the inferior olivary nucleus and the dorsal column nuclei (dorsally)


The tectum:
The dorsal part of the midbrain is seen to have four elevations, named the superior and inferior colliculi. The upper ones are the superior colliculi, and they are functionally part of the visual system, a center for visual reflexes. The lower ones are the inferior colliculi, and these are relay nuclei in the auditory pathway. These colliculi form the “tectum” (a less frequently used term for these colliculi is the quadrigeminal plate). The pineal, a glandular structure, hangs down from the back of the diencephalon and sits between the colliculi.

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Last edited by bebix; 06-20-2011 at 05:39 AM.
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Old 06-19-2011
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Cool Hmmmm

Quote:
Originally Posted by bebix View Post
The tegmentum is the area of the medulla that contains the cranial nerve nuclei, the nuclei of the reticular formation, the ascending tracts, and two special nuclei, the inferior olivary nucleus (discussed above) and the dorsal column nuclei (dorsally)


The tectum:
The dorsal part of the midbrain is seen to have four elevations, named the superior and inferior colliculi. The upper ones are the superior colliculi, and they are functionally part of the visual system, a center for visual reflexes. The lower ones are the inferior colliculi, and these are relay nuclei in the auditory pathway. These colliculi form the “tectum” (a less frequently used term for these colliculi is the quadrigeminal plate). The pineal, a glandular structure, hangs down from the back of the diencephalon and sits between the colliculi.
So that intimate relation between the tectum and the pineal gland explains how a pineal tumor which may compress the dorsal midbrain can cause Parinaud's syndrome! Thanks again Bebix
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