The depressed area between the crura is termed the

interpeduncular fossa The interpeduncular fossa is a deep depression of the ventral surface of the midbrain between the two crura cerebri. It has been found in humans and macaques, but not in rats or mice, showing that this is a relatively new evolutionary region. A ...

, and consists of a layer of gray matter, the posterior perforated substance, which is pierced by small apertures for the transmission of

blood vessels Blood vessels are the structures of the circulatory system that transport blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the tissues of the body. They also take waste and carbon dioxide away fro ...

; its lower part lies on the

ventral Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position prov ...

aspect of the medial portions of the

tegmenta The midbrain is anatomically delineated into the tectum (roof) and the tegmentum (floor). The midbrain tegmentum extends from the substantia nigra to the cerebral aqueduct in a horizontal section of the midbrain. It forms the floor of the midbrain ...

, and contains a nucleus named the interpeduncular ganglion; its upper part assists in forming the floor of the

third ventricle The third ventricle is one of the four connected ventricles of the ventricular system within the mammalian brain. It is a slit-like cavity formed in the diencephalon between the two thalami, in the midline between the right and left lateral ...

Additional images

File:Human brainstem anterior view 2 description.JPG, Human brainstem anterior view

References

External links

* * Central nervous system {{Portal bar, Anatomy

See also

Additional images

References

External links