brain ribonucleic acid amount midbrain ribonucleic acid amount 2026-04-14T19:38:16Z Trait.ontology VT:0011288 The proportion, quantity, or volume of ribonucleic acid in the middle division of the three primary divisions of the developing chordate brain or the corresponding part of the adult brain (in vertebrates, includes a ventral part containing the cerebral peduncles and a dorsal tectum containing the corpora quadrigemina and that surrounds the aqueduct of Sylvius connecting the third and fourth ventricles). Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds. midbrain RNA amount CMO:0003929 midbrain molecular composition trait