Term: trunk horizontal myoseptum
Name: trunk
Synonyms:
Definition: Organism subdivision which is the part of the body posterior to the head and anterior to the post-vent region.
Ontology: Anatomy Ontology [ZFA:0001115]

Name: horizontal myoseptum
Synonyms: horizontal septum
Definition: A connective tissue partition developing at the apex of the chevron-shaped myotome and separating dorsal (epaxial) and ventral (hypaxial) body wall muscle masses.
Ontology: Anatomy Ontology [ZFA:0000671]