Is the cochlear nucleus in the pons?
The cochlear nuclei (CN) are located at the dorso-lateral side of the brainstem, spanning the junction of the pons and medulla. The ventral cochlear nucleus (VCN) on the ventral aspect of the brain stem, ventrolateral to the inferior peduncle.
What is trapezoid body of pons?
Definition. The trapezoid body is an internal transverse pathway in the caudal pons, just dorsal to the pontine nuclei and ventral to the medial lemnisci, carrying decussating auditory fibers from the ventral cochlear nuclei on one side of the brainstem to the superior olivary nuclei on the other.
Where are the cochlear nuclei located?
The cochlear nuclei (CN) in man consist of the dorsal (DCN), superior ventral (SVCN), and inferior ventral (IVCN). The CN is located on the dorsolateral surface of the brain stem at the junction of the medulla with the pons.
Is cochlear nucleus in medulla?
The cochlear nuclei are a group of two small special sensory nuclei in the upper medulla for the cochlear nerve component of the vestibulocochlear nerve. They are part of the extensive cranial nerve nuclei within the brainstem.
What is the trapezoid body in auditory pathway?
Anatomical terms of neuroanatomy The trapezoid body (the ventral acoustic stria) is part of the auditory pathway where some of the axons coming from the cochlear nucleus (specifically, the anterior cochlear nucleus) decussate (cross over) to the other side before traveling on to the superior olivary nucleus.
What makes up the trapezoid body?
The trapezoid body is a bundle of myelinated fibers passing anterior to the superior olivary complex and intermingling with fibers of the medial lemniscus as it crosses the midline.
What are cochlear nuclei?
The cochlear nucleus is the obligatory nucleus in which all ascending information from the cochlea forms synaptic connections with the auditory brain.
What is the dorsal nucleus of trapezoid body?
The dorsal nucleus of the trapezoid body forms a distinctly encapsulated nucleus ventrally in the rostral medulla, dorsal to the trapezoid body and dorsolateral to the pyramid, from the level of the facial nucleus in the medulla to the motor nucleus of the trigeminal nerve in the pons (see Figs 2-11, 2-12).
Is the cochlear nucleus Tonotopic?
The dorsal cochlear nucleus (DCN) receives direct tonotopic projections from the auditory nerve (AN) as well as secondary and descending projections from other sources.
What is the trapezoid body made of?
How is trapezoid body formed?
central auditory pathways Together, these fibres form the trapezoid body. Fibres from the dorsal cochlear nucleus cross the midline to end on the cells of the nuclei of the lateral lemniscus. There they are joined by the fibres from the ventral cochlear nuclei of both sides and from the olivary complex.
Where is the first neurotransmitter released in the central auditory pathway?
They release the neurotransmitter at junctions or synapses that they form on branches from neurons whose cell bodies are in a ganglion (group of neurons) just outside the cochlea. The axons from the ganglion neurons form the auditory nerve, which carries signals into the first stop in the brain, the cochlear nucleus.