Term: somite ventral-most region
Name: somite
Synonyms: somitic mesoderm
Definition: Undifferentiated mesodermal components of early trunk or tail segments or metameres, derived from paraxial mesoderm; forms myotomes, sclerotomes and perhaps dermatomes.
Ontology: Anatomy Ontology [ZFA:0000155]

Name: ventral-most region
Synonyms: ventral-most, ventralmost
Definition:
Ontology: Spatial Ontology [BSPO:0000039]