primary motor cortex morphology trait primary motor cortex ribonucleic acid amount 2025-10-14T19:27:40Z motor cortex ribonucleic acid amount Trait.ontology motor cortex RNA amount VT:0011232 primary motor cortex RNA amount CMO:0004113 The proportion, quantity, or volume of ribonucleic acid in the part of the cerebral cortex that receives projections from the motor thalamus and which projects to motor neurons in the brainstem and spinal cord; the primary motor cortex, or M1, is located on the precentral gyrus and on the anterior paracentral lobule on the medial surface of the brain. Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds. cerebral cortex ribonucleic acid amount