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.
The function of the ear is to convert physical vibration into an encoded nervous impulse. Introduction The ear is divided, semi-artificially, into three regions: Outer Ear, Middle Ear and Inner Ear. The Outer Ear The Outer Ear consists of Pinna or external ear, Meatus or ear canal, the Tympanic membrane or the eardrum.The most important function of the pinna in hearing is the capture and localization of the sound.he function of the ear is to convert physical vibration into an encoded nervous impulse. Introduction The ear is divided, semi-artificially, into three regions: Outer Ear, Middle Ear and Inner Ear. The Outer Ear The Outer Ear consists of Pinna or external ear, Meatus or ear canal, the Tympanic membrane or the eardrum.