lateral lemniscus


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lat·er·al lem·nis·cus

[TA]
a bundle of ascending fibers that originate from the cochlear and auditory relay nuclei of the rhombencephalon, enter the trapezoid body, a transverse fiber stratum in which about half their number decussate, and from here turn rostrally along the lateral side of the spinothalamic tract; in the midbrain, it arches superiorly and enters the inferior colliculus in which all of its fibers terminate; the auditory pathway is transsynaptically extended from here by the brachium of the inferior colliculus to the medial geniculate body of the thalamus, from which in turn the auditory radiation leads to the auditory cortex; intercalated in the trapezoid body and along the ascending trajectory of the lemniscus are several cell groups in which part of the fibers synapse.

lateral lemniscus

An axon tract originating in the cochlear nuclei and ascending to synapse in the inferior colliculi; axons from the inferior colliculi ascend to synapse in the medial geniculate nucleus of the thalamus. This lemniscus is a middle link in the circuit carrying auditory information to the auditory cortex (Heschl's gyrus).
See also: lemniscus
References in periodicals archive ?
Our results also indicate that the prolonged latency of Wave V was greater than that of Wave III and thus suggest that reorganization of the subcortical auditory pathways may take place mainly in the lateral lemniscus, between the level of the superior olivary complex and the inferior colliculus.
In conclusion, the use of bilateral ABR measurements in response to monaural stimulation was able to identify prolonged latencies in Wave III, thought to arise in the cochlear nuclei, and Wave V, thought to arise in the lateral lemniscus, in response to nonsurgical-side (i.e., contralateral to hemispherectomy) stimulation versus surgical-side (ipsilateral to hemispherectomy) stimulation in hemispherectomized patients compared to control subjects.

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