Jump to content

英文维基 | 中文维基 | 日文维基 | 草榴社区

Rostrum (anatomy)

From Wikipedia, the free encyclopedia
The rostrum (beak) of a grey heron

Rostrum (from Latin rostrum, meaning beak) is a term used in anatomy for several kinds of hard, beak-like structures projecting out from the head or mouth of an animal. Despite some visual similarity, many of these are phylogenetically unrelated structures in widely varying species.

(2)

Invertebrates

[edit]
  • In spiders, the rostrum is a part of the mouth of which it borders the opening in front.Homologous of an upper lip, this outgrowth is especially characterised by the presence of a pocket-shaped secreting organ, the rostral gland, only accessible by the sole means of histology and electron microscopy (external link "archentoflor").
  • In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes.[1] It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca.[2]
  • Among insects, the rostrum is the name for the piercing mouthparts of the order Hemiptera as well as those of the snow scorpionflies, among many others. The long snout of weevils is also called a rostrum.[3]
  • Gastropod molluscs have a rostrum or proboscis.[4]
  • Cephalopod molluscs have hard beak-like mouthparts referred to as the rostrum.[5]

Vertebrates

[edit]
Diagram of a wolf skull with key features labelled

In mammals, the rostrum is that part of the cranium located in front of the zygomatic arches, where it holds the teeth, palate, and nasal cavity.[6] Additionally, the corpus callosum of the human brain has a nerve tract known as the rostrum.

The beak or snout of a vertebrate may also be referred to as the rostrum.

See also

[edit]
  • Beak – Part of a bird
  • Nostril – Nose orifice that enables the entry and exit of air.
  • Snout – Extended part of an animal's mouth
  • Proboscis – Elongated mouth part

References

[edit]
  1. ^ Charles Drew (November 17, 2003). "Crustacea". University of Bristol. Archived from the original on July 3, 2012. Retrieved November 7, 2010.
  2. ^ Todd A. Haney, Joel W. Martin & Eric W. Vetter (2007). "Leptostraca". In James T. Carlton (ed.). The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon (4th ed.). University of California Press. pp. 484–495. ISBN 978-0-520-23939-5. Archived from the original on 2020-09-12. Retrieved 2020-09-12.
  3. ^ George Gordh, Gordon Gordh & David Headrick (2003). "Rostrum". A Dictionary of Entomology. CAB International. p. 792. ISBN 978-0-85199-655-4.
  4. ^ Douglas Grant Smith (2001). "Mollusca (gastropods, pelecypods)". Pennak's freshwater invertebrates of the United States: Porifera to Crustacea (4th ed.). John Wiley and Sons. pp. 327–400. ISBN 978-0-471-35837-4. Archived from the original on 2020-09-12. Retrieved 2020-09-12.
  5. ^ Burt Carter. "Cephalopods". Invertebrate Paleobiology. Archived from the original on 2012-04-02. Retrieved 2011-09-22.
  6. ^ Elbroch, Mark "Animal Skulls: A Guide to North American Species", Stackpole Books 2006, p9
  7. ^ William F. Perrin; Bernd Würsig; J.G.M. Thewissen (26 February 2009). Encyclopedia of Marine Mammals. Academic Press. ISBN 978-0-08-091993-5. Archived from the original on 2 September 2020. Retrieved 12 September 2020.
  8. ^ "Basic anatomy of Cetaceans - Dolphins". Robin's Island. Archived from the original on November 17, 2010. Retrieved November 7, 2010.
  9. ^ Wueringer, Barbara E.; Squire, Lyle; Kajiura, Stephen M.; Hart, Nathan S.; Collin, Shaun P. (2012). "The function of the sawfish's saw". Current Biology. 22 (5): R150 – R151. doi:10.1016/j.cub.2012.01.055. PMID 22401891.


');