Term: otolith lumen
Name: otolith
Synonyms: immature otolith, immature otoliths, statolith
Definition: Portion of organism substance composed of calcium carbonate located in the otolith organ and positioned over a sensory macula; two form in each vesicle during the late segmentation period. (Also see Anatomical Atlas entry for otolith by T. Whitfield.)
Ontology: Anatomy Ontology [ZFA:0001617]

Name: lumen
Synonyms:
Definition: Anatomical space within a tubular organ, duct, or vessel.
Ontology: Anatomy Ontology [ZFA:0005930]