Oesophageal pouch

Oesophageal pouch

The oesophageal pouches (also known as sugar glands)[1] are a pair of pouches connected to the oesophagus of all molluscs, and represent a synapomorphy of the phylum.[2]

Contents

Morphology

Usually forming a pair of lateral structures, they take various forms, but usually account for a fair portion of the anterior volume of the creeping molluscs and scaphopods.[3][4][5][6][7] There is a single pouch ventral to the rear of the radula in some nudibranchs.[6] The pouches are lines with ciliated secretory cells.[8]

Function

The pouches contain digestive enzymes that break down starch and other polysaccharides,[1] and also extrude mucus.[6]

Occurrence

The features are considered ancestral to molluscs,[2] but have been secondarily lost in the Heterobranchia.[9] However, it is not certain that all oesophageal diverticulae are homologous.[10][11]

References

  1. ^ a b STONE AND MORTON. "THE DISTRIBUTION OF CELLULASES AND RELATED ENZYMES IN MOLLUSCA". J. Mollus. Stud. (1958) 33 (3): 127-141. http://mollus.oxfordjournals.org/content/33/3/127.full.pdf. 
  2. ^ a b Sturm, Charles F; Pearce, Timothy A; Valdés, ÁNgel (2006-07). The mollusks: a guide to their study, collection, and preservation. ISBN 9781581129304. http://books.google.ca/books?id=-NbmHx93s8gC&pg=PA2. 
  3. ^ Haszprunar, G. (1987). "Anatomy and affinities of cocculinid limpets (Mollusca, Archaeogastropoda)". Zoologica Scripta 16 (4): 305–324. doi:10.1111/j.1463-6409.1987.tb00077.x.  edit
  4. ^ Haszprunar, G. (1989). "The Anatomy of Melanodrymia aurantiaca Hickman, a Coiled Archaeogastropod from the East Pacific Hydrothermal Vents (Mollusca, Gastropoda)". Acta Zoologica 70 (3): 175–186. doi:10.1111/j.1463-6395.1989.tb01068.x.  edit
  5. ^ Ruthensteiner, B.; Schropel, V.; Haszprunar, G. (2010). "Anatomy and affinities of Micropilina minuta Warén, 1989 (Monoplacophora: Micropilinidae)". Journal of Molluscan Studies 76 (4): 323–332. doi:10.1093/mollus/eyq013.  edit
  6. ^ a b c Crampton, D. M. (2010). "Functional anatomy of the buccal apparatus of Onchidoris bilamellata (Mollusca: Opisthobranchia)". The Transactions of the Zoological Society of London 34: 45. doi:10.1111/j.1096-3642.1977.tb00372.x.  edit
  7. ^ Urgorri, V.; García-Álvarez, O.; Luque, . (2005). "Laevipilina Cachuchensis, A New Neopilinid (Mollusca: Tryblidia) from off North Spain". Journal Molluscan Studies 71: 59–66. doi:10.1093/mollus/eyi008.  edit
  8. ^ Morton, J. E. (2009). "The habits and feeding organs of Dentalium entalis". Journal of the Marine Biological Association of the United Kingdom 38 (02): 225. doi:10.1017/S0025315400006032.  edit
  9. ^ Ponder, W. F. (1991). "MARINE VALVATOIDEAN GASTROPODS—IMPLICATIONS FOR EARLY HETEROBRANCH PHYLOGENY". Journal of Molluscan Studies 57: 21. doi:10.1093/mollus/57.1.21.  edit
  10. ^ Lobo-Da-Cunha, A.; Oliveira, E.; Alves, Â.; Coelho, R.; Calado, G. (2010). "Light and electron microscopic study of the anterior oesophagus ofBulla striata(Mollusca, Opisthobranchia)". Acta Zoologica 91 (2): 125–138. doi:10.1111/j.1463-6395.2009.00392.x.  edit
  11. ^ Malacologia 37: 375–442. 1996. 

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Topic outline of health science — Health sciences are the group of disciplines of applied science dealing with human and animal health. There are two parts to Health Sciences: the study, research and development of the knowledge of health, and the application of that knowledge to …   Wikipedia

  • List of health sciences topics — General topics= *health *disease *doctor *physician *surgeon *surgery *hospital *nurse *medicationDiagnostic methods*physical examination *medical history *auscultation *stethoscope *percussion *medical imaging *X ray *medical ultrasonography… …   Wikipedia

  • Esophageal atresia — Classification and external resources Common anatomical types of esophageal atresia a) Esophageal atresia with distal tracheoesophageal fistula (86%). b) Isolated esophageal atresia without tracheoesophageal fistula (7%). c) H type… …   Wikipedia

  • Diverticulum — A small bulging sac pushing outward from the colon wall is a diverticulum. As a person ages, pressure within the large intestine (colon) causes pockets of tissue (sacs) that push out from the colon walls. The plural is diverticula. Diverticula… …   Medical dictionary

  • Пищеварительная система — обеспечивает усвоение организмом необходимых ему в качестве источника энергии, а также для обновления клеток и роста питательных веществ. Пищеварительный аппарат человека представлен пищеварительной трубкой, крупными железами пищеварительного… …   Атлас анатомии человека

  • Hernia — A general term referring to a protrusion of a tissue through the wall of the cavity in which it is normally contained. More specifically, a hernia often refers to an opening or weakness in the muscular structure of the wall of the abdomen. This… …   Medical dictionary

  • Zenker's diverticulum — Infobox Disease Name = Zenker s diverticulum Caption = DiseasesDB = 31174 ICD10 = ICD10|K|22|5|k|20 ICD9 = ICD9|530.6 ICDO = OMIM = MedlinePlus = eMedicineSubj = med eMedicineTopic = 2777 MeshID = D016672 In anatomy, Zenker s diverticulum, also… …   Wikipedia

  • fistula — An abnormal passage from one epithelial surface to another epithelial surface. [L. a pipe, a tube] abdominal f. a fistulous passage connecting one of the abdominal viscera …   Medical dictionary

  • diverticulum — n.; pl. diverticula a sac or pouch formed at weak points in the walls of the alimentary tract. They may be caused by increased pressure from within (pulsion diverticula) or by pulling from without (traction diverticula). A pharyngeal diverticulum …   The new mediacal dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”