Where is cochlear nucleus located

Cochlear nuclei is the nuclei that receive first-order auditory input from the organ of Corti in the cochlea of the inner ear. The cochlear nuclei are divided into a dorsal and a ventral group. The dorsal cochlear nuclei give rise to the dorsal acoustic stria, which immediately cross the midline and contribute fibers that ascend contralaterally in the lateral lemniscus. The ventral cochlear nuclei are the source of two other auditory pathways, the intermediate and the ventral acoustic stria.

The former also crosses the midline and, like the dorsal acoustic stria, ascends in the contralateral lateral lemniscus. URL of Article. Gross Anatomy The dorsal and ventral nuclei are located in the dorsolateral upper medulla and are separated by the fibers of the inferior cerebellar peduncle : the ventral cochlear nucleus is ventral and lateral to the dorsal cochlear nucleus and separates the cochlear and vestibular fibers of the vestibulocochlear nerve the dorsal cochlear nucleus is dorsal to the inferior cerebellar peduncle and ventral nucleus and forms the auditory tubercle which is a small bulge on the dorsal aspect of the restiform body From both nuclei, second-order sensory neurons project superiorly into the pons as part of the ascending auditory pathway.

Innervation The nucleus houses the sensory cell bodies of the cochlear nerve which relay auditory information to the auditory components of the brainstem. Clinically oriented anatomy. Read it at Google Books - Find it at Amazon 2. Last's anatomy, regional and applied. Churchill Livingstone. Read it at Google Books - Find it at Amazon 3. Susan Standring. Gray's Anatomy. ISBN: 4. Robert H. They both appear hypointense on T2 weighted images:.

Its limits are:. Start the segmentation at the center of the nucleus. Choose an axial slice where the dorsal acoustic stria das are clearly visible: they are orange on CED-RGB map and cover the dorsal and dorso-lateral aspects of the inferior cerebellar peduncle icp.

Through the medulla , one projection bifurcates, and projects to the contralateral the superior olivary complex SOC via the trapezoid body , whilst the other half shoots to the ipsilateral SOC. This projection is called the ventral acoustic stria or, more commonly, the trapezoid body. Another projection, called the dorsal acoustic stria DAS, also known as the stria of von Monakow , rises above the medulla into the pons where it hits the nucleus of the lateral lemniscus along with its kin, the intermediate acoustic stria IAS, also known as the stria of Held.

The IAS decussates across the medulla, before joining the ascending fibers in the contralateral lateral lemniscus. The lateral lemniscus contains cells of the nuclei of the lateral lemniscus, and in turn projects to the inferior colliculus. The inferior colliculus receives direct, monosynaptic projections from the superior olivary complex the contralateral dorsal acoustic stria, some classes of stellate neurons of the VCN, as well as from the different nuclei of the lateral lemniscus.

All of these inputs terminate in the inferior colliculus, although there are a few small projections that bypass the inferior colliculus and project to the medial geniculate, or other forebrain structures. The principal projection of the inferior colliculus is to the medial geniculate body in the thalamus. The medial geniculate then projects to the auditory cortex, in the superior temporal gyrus.