Preferred Label : posterior commissure;
Uberon definition : Rounded band of white fibers crossing the middle line on the dorsal aspect of the
upper end of the cerebral aqueduct. It is important in the bilateral pupillary light
reflex. Its fibers acquire their medullary sheaths early, but their connections have
not been definitely determined. Most of them have their origin in a nucleus, the nucleus
of the posterior commissure (nucleus of Darkschewitsch), which lies in the central
gray substance of the upper end of the cerebral aqueduct, in front of the nucleus
of the oculomotor nerve. Some are probably derived from the posterior part of the
thalamus and from the superior colliculus, whereas others are believed to be continued
downward into the medial longitudinal fasciculus. The posterior commissure interconnects
the pretectal nuclei, mediating the consensual pupillary light reflex[WP]. Diencephalic
tract which is located in the vicinity of the dorsal diencephalon and mesencephalon
and connects the pretectal nuclei. From Neuroanatomy of the Zebrafish Brain[ZFA].;
Uberon synonym : epithalamic commissure; caudal commissure;
Uberon related term : posterior commissure (Lieutaud);
Origin ID : 0000936;
UMLS CUI : C0152327;
Automatic exact mappings (from CISMeF team)
- Semantic type(s)
- UMLS correspondences (same concept)
- Uberon cross reference
- connects
- part of
Rounded band of white fibers crossing the middle line on the dorsal aspect of the
upper end of the cerebral aqueduct. It is important in the bilateral pupillary light
reflex. Its fibers acquire their medullary sheaths early, but their connections have
not been definitely determined. Most of them have their origin in a nucleus, the nucleus
of the posterior commissure (nucleus of Darkschewitsch), which lies in the central
gray substance of the upper end of the cerebral aqueduct, in front of the nucleus
of the oculomotor nerve. Some are probably derived from the posterior part of the
thalamus and from the superior colliculus, whereas others are believed to be continued
downward into the medial longitudinal fasciculus. The posterior commissure interconnects
the pretectal nuclei, mediating the consensual pupillary light reflex[WP]. Diencephalic
tract which is located in the vicinity of the dorsal diencephalon and mesencephalon
and connects the pretectal nuclei. From Neuroanatomy of the Zebrafish Brain[ZFA].
