midbrain

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midbrain

A Dictionary of Biology | 2004 | © A Dictionary of Biology 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

midbrain (mesencephalon) One of the three sections of the brain of a vertebrate embryo. Unlike the forebrain and the hindbrain, the midbrain does not undergo further subdivision to form additional zones. In mammals it becomes part of the brainstem, but in amphibians, reptiles, and birds the roof of the midbrain becomes enlarged as the tectum, a dominant centre for integration, and may include a pair of optic lobes.

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midbrain

A Dictionary of Nursing | 2008 | © A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

midbrain (mesencephalon) (mid-brayn) n. the small portion of the brainstem, excluding the pons and the medulla, that joins the hindbrain to the forebrain.

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