|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 12 van 15 gevonden artikelen
| Titel: |
Specialized sound reception in dolphins—a hint for the function of the dorsal cochlear nucleus in mammals |
| Auteur: |
Schulmeyer, Frank J. Adams, Joe C. Oelschlager, Helmut H. A. |
| Verschenen in: |
Historical biology |
| Paginering: | Jaargang 14 (2000) nr. 1-2 pagina's 53-56 |
| Jaar: |
2000 |
| Inhoud: |
Dolphins have developed a specialized system for sound reception. Their pinnae are reduced and shifted under the skin, and sound is transduced via the lower jaw to the auditory ossicles. In line with their auditory functions (notably echolocation), most auditory nuclei in the brain stem of dolphins are extremely well-developed. In contrast, the dorsal cochlear nucleus is drastically reduced. In the La Plata dolphin the volume of the dorsal cochlear nucleus is 4 mm3, while that of the ventral cochlear nucleus is 98 mm3. The reduction in size of the dorsal cochlear nucleus is also seen in baleen whales, which do not echolocate and are, in contrast to dolphins, tuned to deep frequencies. However, dolphins and baleen whales have the reduction of the outer ear in common. In humans, cats, bats and seals, there is a correlation between the development of pinnae and the dorsal cochlear nucleus. So, we conclude that the function of the dorsal cochlear nucleus in mammals could be to eliminate “auditory artifacts”; arising from the operation of the pinnae. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 12 van 15 gevonden artikelen
| << vorige | volgende >> |