Plate 17.356 Mesencephalon-Diencephalon Junction
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed
Human, 10% formalin, Weigert's hematoxylin (Loyez), 1 x.
Gyrus rectus: inferior surface of the frontal lobe. Medial to orbital gyrus.
Mamillary body: A pair of spherical nuclear masses caudal to the optic chiasma and protruding from the ventral surface of the posterior hypothalamus in the interpeduncular fossa (between the cerebral peduncles). Concerned with memory function.
Substantia nigra: A pigmented (melanin) nuclear mass located in the base of the midbrain above the cerebral peduncles. invariably the site of pathologic changes in Parkinson's disease.
Red nucleus: So-called because of a pinkish color in the fresh state owing to its high vascularity. Links the cerebellum, cerebral cortex, and spinal cord.
Periaqueductal gray: A nuclear mass surrounding the aqueduct of Sylvius. Related to pain mechanisms.
Cerebellar folia: Leaf-like folds of the cerebellar cortex separated from each other by sulci and supported by a core of white matter.
Aqueduct of Sylvius: Connects the fourth with the third ventricle.
Cerebral peduncle: Descending corticofugal fiber system. Lesion results in contralateral muscle weakness or paralysis.
Superior colliculus: Cellular mass concerned with visual reflexes.
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