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The trapezoid body (the ventral acoustic stria) is part of the auditory pathway where some of the axons coming from the cochlear nucleus (specifically, the anterior cochlear nucleus) decussate (cross over) to the other side before traveling on to the superior olivary nucleus. This is believed to help with localization of sound.

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  • Das Corpus trapezoideum, auch Trapez­körper genannt, liegt im unteren Hirnstamm an der Grenze von Hinterhirn zu Markhirn, im kaudalen Pons (Brücke) zählt es zur weißen Substanz der ventralen Brückenhaube (Tegmentum pontis). Bei einigen Tieren, beispielsweise Katzen, bildet es unterhalb der Brücke einen zarten Querwulst auf dem ventralen Hirnstamm. Die so bereits mit bloßem Auge erkennbare Struktur wird durch zahlreiche quer verlaufende Faserzüge hervorgerufen, hier kreuzen die meisten der Axone von 2. Neuronen der Hörbahn. Diese Fasern ziehen, vom Nucleus cochlearis anterior (vorderer Schneckenkern) ausgehend, jeweils auf die Gegenseite und steigen auf zum Nucleus olivaris superior (oberer Olivenkern), zu den Nuclei lemnisci lateralis (Schleifenkerne) und vor allem zum Colliculus inferior (unterer Hügel), der im Dach des Mittelhirns (Tectum mesencephali) liegt. Diese Verbindungen sind Teil des Lemniscus lateralis, der daneben auch ungekreuzte Fasern und solche vom hinteren Schneckenkern (Nucleus cochlearis posterior) führt. Im Bereich des Corpus trapezoideum sind einige Kerngebiete gruppiert, in denen Fasern schon hier auf 3. Neuronen der Hörbahn umgeschaltet werden, die * Nuclei corporis trapezoidei, beim Menschen unterscheidet man jederseits drei: * Nuclei anterior corporis trapezoidei * Nuclei lateralis corporis trapezoidei * Nuclei medialis corporis trapezoidei Etwa in Höhe des Corpus trapezoideum treten der VI. (Nervus abducens), VII. (Nervus facialis) und VIII. (Nervus vestibulocochlearis) Hirnnerv an die Hirnoberfläche. (de)
  • The trapezoid body (the ventral acoustic stria) is part of the auditory pathway where some of the axons coming from the cochlear nucleus (specifically, the anterior cochlear nucleus) decussate (cross over) to the other side before traveling on to the superior olivary nucleus. This is believed to help with localization of sound. The trapezoid body is located in the caudal pons, or more specifically the pontine tegmentum. It is situated between the pontine nuclei 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. (en)
  • O corpo trapezoide é a parte da onde alguns axônios advindos do núcleo coclear decussam (cruzam para o lado contralateral) antes de atingir o núcleo olivar inferior. Acredita-se que essa etapa auxilie a localização espacial dos estímulos sonoros O corpo trapezoide localiza-se na parte caudal da ponte, mais especificamente na região do tegmento pontino. Ele situa-se entre o núcleo pontino e o lemnisco medial. Após as fibras nervosas do núcleo coclear decussarem no corpo trapezoide e irem até o núcleo olivar infeior, a via segue pelo , passando pelo colículo inferior e pelo núcleo geniculado medial do tálamo até atingir o córtex auditivo primário (pt)
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  • Terminal nuclei of the cochlear nerve, with their upper connections. 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. Vestibular nerve, divided at its entrance into the medulla oblongata. 2. Cochlear nerve. 3. Accessory nucleus of acoustic nerve. 4. Tuberculum acusticum. 5. Efferent fibers of accessory nucleus. 6. Efferent fibers of tuberculum acusticum, forming the striae medullares, 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. Trapezoid nucleus. 10. Lateral lemniscus. 11. Raphé. 12. Pyramidal tracts. 13. Fourth ventricle. 14. Inferior peduncle. (en)
dbp:latin
  • corpus trapezoideum (en)
dbp:name
  • Trapezoid body (en)
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rdfs:comment
  • Das Corpus trapezoideum, auch Trapez­körper genannt, liegt im unteren Hirnstamm an der Grenze von Hinterhirn zu Markhirn, im kaudalen Pons (Brücke) zählt es zur weißen Substanz der ventralen Brückenhaube (Tegmentum pontis). Bei einigen Tieren, beispielsweise Katzen, bildet es unterhalb der Brücke einen zarten Querwulst auf dem ventralen Hirnstamm. Im Bereich des Corpus trapezoideum sind einige Kerngebiete gruppiert, in denen Fasern schon hier auf 3. Neuronen der Hörbahn umgeschaltet werden, die (de)
  • The trapezoid body (the ventral acoustic stria) is part of the auditory pathway where some of the axons coming from the cochlear nucleus (specifically, the anterior cochlear nucleus) decussate (cross over) to the other side before traveling on to the superior olivary nucleus. This is believed to help with localization of sound. (en)
  • O corpo trapezoide é a parte da onde alguns axônios advindos do núcleo coclear decussam (cruzam para o lado contralateral) antes de atingir o núcleo olivar inferior. Acredita-se que essa etapa auxilie a localização espacial dos estímulos sonoros (pt)
rdfs:label
  • Corpus trapezoideum (de)
  • Corpo trapezoide (pt)
  • Trapezoid body (en)
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  • Trapezoid body (en)
  • corpus trapezoideum (en)
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