Editing Midbrain (section)

{{short description|Forward-most portion of the brainstem}}
{{about|the midbrain in vertebrates|the midbrain in insects|olfactory deutocerebrum}}
{{Infobox brain
| Name            = Midbrain
| Latin           = mesencephalon
| Image           = Midbrain of the Human Brainstem.svg
| Caption        = Figure shows the midbrain ('''A''') and surrounding regions; [[sagittal]] view of one [[cerebellar hemisphere]]. B: [[Pons]]. C: [[Medulla oblongata|Medulla]]. D: [[Spinal cord]]. E: [[Fourth ventricle]]. F: [[Arbor vitae (anatomy)|Arbor vitae]]. G: [[Nodule of vermis|Nodule]]. H: [[Cerebellar tonsil|Tonsil]]. I: [[Posterior lobe of cerebellum|Posterior lobe]]. J: [[Anterior lobe of cerebellum|Anterior lobe]]. K: [[Inferior colliculus]]. L: [[Superior colliculus]].
| Image2           = Location of Midbrain in inferior view.png
| Caption2         = Inferior view in which the midbrain is encircled blue.
| IsPartOf        = [[Brainstem]]
| Components      =
| Artery          =
| Vein            =
| pronunciation   = {{IPAc-en|UK|ˌ|m|ɛ|s|ɛ|n|ˈ|s|ɛ|f|ə|l|ɒ|n|,_|-|k|ɛ|f|-}}, {{IPAc-en|US|ˌ|m|ɛ|z|ə|n|ˈ|s|ɛ|f|ə|l|ə|n}};<ref>{{Cite OED|mesencephalon}}</ref>
|System=|Function=|Location=}}

The '''midbrain''' or '''mesencephalon''' is the uppermost portion of the [[brainstem]] connecting the [[diencephalon]] and [[cerebrum]] with the [[pons]].'''<ref name="Sinnatamby-2011">{{Cite book |last=Sinnatamby |first=Chummy S. |title=Last's Anatomy |vauthors= |publisher= |year=2011 |isbn=978-0-7295-3752-0 |edition=12th |pages=476}}</ref>''' It consists of the [[cerebral peduncle]]s, [[tegmentum]], and [[tectum]].

It is functionally associated with vision, hearing, motor control, sleep and wakefulness, arousal ([[alertness]]), and temperature regulation.<ref name="Breedlove">Breedlove, Watson, & Rosenzweig. Biological Psychology, 6th Edition, 2010, pp. 45-46</ref>

The name ''mesencephalon'' comes from the Greek ''mesos'', "middle", and ''enkephalos'', "brain".<ref>[[Mosby's Medical, Nursing & Allied Health Dictionary]],≈ Fourth Edition, Mosby-Year Book 1994, p. 981</ref>