Mesencephalon'da (orta beyin) bulunan bazı çekirdekler: Nucleus mesencephalicus nervi trigemini. Nucleus nervi abducentis. Nucleus ruber. Nucleus posterior nervi vagi. Nucleus salivatorius inferior. Nucleus pretectalis. Ayrıca, substantia nigra ve area tegmentalis ventralis'te dopamin üretilir. Mesencephalon, aynı zamanda III. (nervus oculomotorius) ve IV. (nervus trochlearis) kranial sinirlerin çıkış yeridir.
Mezensefalon (orta beyin), beyin sapının üst bölümünde bulunur. Anatomik olarak, tectum (veya corpora quadrigemina), tegmentum, aqueductus mesencephali ve pedunculi cerebri isimli oluşumları içerir. Aşağı doğru ponsa, yukarı doğru ise ara beyne (diencephalon) katılır.
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bakıldığında Mickey Fare'nin yüzüne benzer [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon). \n\n* **Kulakları**: Crus cerebrii [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon).\n* **Gözleri**: Nucleus rubens [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon).\n* **Kaşları**: Substantia nigra [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon).\n* **Ağzı**: Aquaductus cerebrii [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon).\n* **Çenesi**: Colliculus superiorlar [```3```](https://eksisozluk.com/mezensefalon--2335816?nr=true&rf=mesencephalon).\n\nAyrıca, mezencephalon'un kesitinde serebral pedinküller, tegmentum, aqueductus mesencephali ve birkaç çekirdek ile sinir demeti bulunur 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