Term Name:	horizontal septum
Synonyms:	horizontal myoseptum, horizontal septum of vertebra
Definition:	A logitudinal sheet of continuous connective tissue partition developing at the apex of the chevron-shaped myotome and separating dorsal (epaxial) and ventral (hypaxial) body wall muscle masses; each is destined to become, respectively, the epaxial and hyopaxial musculature.
Ontology:	Uberon Ontology [UBERON:0003901]