quadrigeminal bodies

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in·fe·ri·or col·lic·u·lus

the ovoid, paired, inferior eminence of the laminae of mesencephalic tectum; it receives the lateral lemniscus and projects by way of the brachium of inferior colliculus to the medial geniculate body of the thalamus, and is thus an essential way station in the central auditory pathway.

qua·dri·gem·i·nal bod·ies

(kwahdri-jemi-năl bodēz)
Four rounded protrusions on the posterior surface of the mesencephalon.

quadrigeminal bodies

Four rounded projections from the roof of the midbrain.
See: colliculus inferior; colliculus superior