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Trapezoid body

The trapezoid body or ventral acoustic stria is a structure in the pontine tegmentum formed by the crossing-over (decussation) of a portion of the efferent second-order fibers of the ventral cochlear nucleus (anterior cochlear nucleus). After decussating, some of these fibres proceed to ascend in the contralateral lateral lemniscus to reach and terminate in the dorsal nucleus of lateral lemniscus, and inferior colliculus.[1]: 383 

The trapezoid body is part of the auditory pathway. It is one of three distinct decussating second-order efferent fiber pathways of the cochlear nuclei (the other two being the dorsal acoustic striae, and intermediate acoustic striae).[1]: 383  Not all efferents of the cochlear nuclei decussate though; the partial decussation of the cochear nuclei afferents is thought to be functionally important for sound localization.[2]

Anatomy

The trapezoid body is formed by horizontally-oriented, commissural fibers[1]: 107  which are readily identifiable.[1]: 383 

Projections

The fibres of the trapezoid body terminate (synapse) in the (contralateral):[1]: 383 

Relations

It is situated in (the caudal portion of[2]) the ventral pontine tegmentum[1] at the level of the pontomedullary junction.[3] It is situated immediately dorsal/posterior to the pontine nuclei, and ventral/anterior to the medial lemnisci.[2]

References

  1. ^ a b c d e f Patestas, Maria A.; Gartner, Leslie P. (2016). A Textbook of Neuroanatomy (2nd ed.). Hoboken, New Jersey: Wiley-Blackwell. ISBN 978-1-118-67746-9.
  2. ^ a b c Mendoza, John E. (2011). "Trapezoid Body". In Jeffrey S. Kreutzer; John DeLuca; Bruce Caplan (eds.). Encyclopedia of Clinical Neuropsychology. Springer New York. p. 3504. doi:10.1007/978-0-387-79948-3_807. ISBN 978-0-387-79947-6.
  3. ^ Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York: Elsevier. p. 452. ISBN 978-0-7020-7707-4. OCLC 1201341621.


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