DRUG DESCRIPTION. NAMENDA XR is an orally active NMDA receptor antagonist. The chemical name for memantine hydrochloride is 1-amino-3,5-dimethyladamantane hydrochloride with the following structural formula: The molecular formula is C12H21Nâ¢HCl and the molecular weight is 215.76.
There are three main parts to the ear, including the inner ear, middle ear and outer ear. In order for hearing to occur, there is a sequence of actions that must occur to transform waves of sound in the air into electrical impulses. These impulses are transmitted to the brain by the auditory (hearing) nerve.
Only mammals have the outside ear parts called auricles. The ears of different mammals work basically the same way that human ears do. However, many mammals can move their auricles to pick up sound coming from any direction.uricle: bats ear. The huge auricles (outside ear parts) of a bat help it to tell from which direction a sound is coming. Dr. Merlin D. TuttleConservation International/Photo Researchers. The huge auricles (outside ear parts) of a bat help it to tell from which direction a sound is coming.