Quadrigeminal plate

Last revised by Calum Worsley on 30 Jun 2021

The quadrigeminal plate, also known as the tectal plate or tectum, is constituted by the superior and inferior colliculi.

The tectum is the dorsal portion of the midbrain (brainstem), located posteriorly to the mesencephalic aqueduct. It derives from the alar plate of the neural tube during embryonic development.

Masses in the region of the tectum can obstruct the cerebral aqueduct resulting in obstructive hydrocephalus.

Derives from the Latin word "tectum" meaning "roof".

Supplied by the collicular (or quadrigeminal) artery, a branch of the P1 (sometimes P2) segment of the posterior cerebral artery.

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Cases and figures

  • Case 1a: labeled 30 and 51
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  • Case 1b: labeled 40
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  • Figure 1: midbrain (axial) superior colliculi
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  • Figure 2: midbrain (axial) inferior colliculi
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  • Figure 3: midbrain (axial) inferior colliculi
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  • Figure 4: gross pathology brainstem (posterior view)
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  • Figure 5: colliculi connections (Gray's illustration)
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