trapezoid body

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Either of the two diamond-shaped nuclei near the bottom of the pons that receive nerve impulses from the auditory receptors and project to the superior olivary nucleus. Each trapezoidal body contains interneurons that inhibit impulses from the ear on the same side and excite those from the opposite side, amplifying the left-right differences in the signals transmitted to the binaural neurons of the superior olivary nucleus and thereby facilitating sound localization. [From Greek trapezion a small table, diminutive of trapeza a table, from tetra- four + peza a foot]

Subjects: Psychology.

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