Corpus: Midbrain
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Synonym: midbrain
English: , mesencephalon
Definition[Bearbeiten]
The mesencephalon is the most superior part of the brain stem. It lies between the pons and the diencephalon (diencephalon).
Classification[Bearbeiten]
The mesencephalon can be divided into three layers:
- visible from the front are the crura cerebri
- The tegmentum follows
- The tectum with the four-hump plate (lamina tecti), consisting of the two upper (superior colliculi) and the two lower (inferior colliculi) mounds, is located at the very dorsal end.
The mesencephalon is traversed by the aqueductus mesencephali.
Obital systems and nuclear areas[Bearbeiten]
The following important pathway systems and nuclei are located in the midbrain:
- Nucleus nervi oculomotorii
- Nucleus nervi trochlearis
- Nucleus oculomotorius accessorius (Edinger-Westphal)
- Nucleus mesencephalicus nervi trigemini
- Nucleus ruber
- Substantia nigra
- Formatio reticularis
- Tractus corticospinalis
- Tractus spinothalamicus anterior and lateralis
- Tractus tegmentalis centralis
- Lemniscus medialis and lateralis
- Fasciculus longitudinalis medialis and dorsalis
- Fibrae corticopontinae
- Fibrae corticonucleares
- Fibrae temporopontinae