Terminal nuclei of the
, with their upper connections. (Schematic.) The vestibular nerve with its terminal nuclei and their efferent fibers have been suppressed. On the other hand, in order not to obscure the trapezoid body, the efferent fibers of the terminal nuclei on the right side have been resected in a considerable portion of their extent. The trapezoid body, therefore, shows only one-half of its fibers, viz., those that come from the left. 1.
, divided at its entrance into the
of acoustic nerve. 4.
. 5. Efferent fibers of accessory nucleus. 6. Efferent fibers of
, forming the
, with 6’, their direct bundle going to the
superior olivary nucleus
of the same side; 6’’, their decussating bundles going to the superior olivary nucleus of the opposite side. 7. Superior olivary nucleus. 8. Trapezoid body. 9.
Anatomical terms of neuroanatomy
trapezoid body is part of the auditory pathway where some of the axons coming from the cochlear nucleus decussate, or cross over to the other side before traveling on to the superior olivary nucleus. This is believed to help with localization of sound. [1 ]
The trapezoid body is located in the caudal
pons, or more specifically the pontine tegmentum. It is situated between the pontine nucleus and the medial lemniscus. After nerves from the cochlear nucleus cross over in the trapezoid body and go on to the superior olivary nucleus, they continue to the lateral lemniscus, then the inferior colliculus, then the medial geniculate body, before finally arriving at the primary auditory cortex. [2 ]
References [ edit ]
^ Mendoza, John E. (2011). "Trapezoid Body". In Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan (eds.). Encyclopedia of Clinical Neuropsychology. Springer New York. pp. 2549–2549. ISBN 978-0-387-79947-6 . Retrieved . 2015-03-01
^ Waxman, Stephen (2013-08-02). Clinical Neuroanatomy 27/E (27 edition ed.). New York: McGraw-Hill Medical. ISBN 9780071797979.