Ensiklopedia Dunia

Technopedia Center

Faculty of Engineering and Computer Science
S1 Informatics S1 Information Systems S1 Information Technology S1 Computer Engineering S1 Electrical Engineering S1 Civil Engineering

faculty of Economics and Business
S1 Management S1 Accountancy

Faculty of Letters and Educational Sciences
S1 English literature S1 English language education S1 Mathematics education S1 Sports Education

Oesophageal pouch - Wikipedia

From Wikipedia, the free encyclopedia

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]

Morphology

Usually forming a pair of lateral structures, oesophageal pouches 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 nudibranch sea slugs.^[6] The pouches are lined 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] and are present in monoplacophorans,^[9] but have been secondarily lost in the Heterobranchia.^[10] However, it is not certain that all oesophageal diverticulae are homologous.^[11]^[12]

References

^ ^a ^b "The Distribution of Cellulases and Related Enzymes in Mollusca". Journal of Molluscan Studies. 1958. doi:10.1093/oxfordjournals.mollus.a064810.
^ ^a ^b Sturm, Charles F; Pearce, Timothy A; Valdés, Ángel (July 2006). The mollusks: a guide to their study, collection, and preservation. ISBN 978-1-58112-930-4.
^ 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. S2CID 222189563.
^ 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.
^ 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.
^ ^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: 45–86. doi:10.1111/j.1096-3642.1977.tb00372.x.
^ Urgorri, V.; García-Álvarez, O.; Luque, Á. (2005). "Laevipilina Cachuchensis, A New Neopilinid (Mollusca: Tryblidia) from off North Spain". Journal of Molluscan Studies. 71: 59–66. doi:10.1093/mollus/eyi008.
^ Morton, J. E. (2009). "The habits and feeding organs of Dentalium entalis" (PDF). Journal of the Marine Biological Association of the United Kingdom. 38 (2): 225–238. doi:10.1017/S0025315400006032. S2CID 86547255.
^ 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.
^ Ponder, W. F. (1991). "Marine Valvatoidean Gastropods—Implications for Early Heterobranch Phylogeny". Journal of Molluscan Studies. 57: 21–32. doi:10.1093/mollus/57.1.21.
^ Lobo-Da-Cunha, A.; Oliveira, E.; Alves, Â.; Coelho, R.; Calado, G. (2010). "Light and electron microscopic study of the anterior oesophagus of Bulla striata (Mollusca, Opisthobranchia)". Acta Zoologica. 91 (2): 125–138. doi:10.1111/j.1463-6395.2009.00392.x.
^ Mikkelsen PM (1996). "The evolutionary relationships of Cephalaspidea S.L. (Gastropoda: Opisthobranchia): A phylogenetic analysis". Malacologia. 37: 375–442.

v t e Gastropod anatomy
Shell	Aperture Apex Body whorl Callus Columella Lip Lira Nacre Periostracum Peristome Planispiral Plait Protoconch Sculpture Selenizone Siphonal canal Siphonal notch Spire Stromboid notch Suture Umbilicus Valve Varix Whorl
Other hard parts	Clausilium Love dart Operculum Pearl Radula
External soft parts	Caryophyllidia Caudal mucous pit Cerata Cnidosac Mantle Mentum Notum Parapodium Pneumostome Rhinophore Semper's organ Siphon Suprapedal gland
Internal soft parts	Circulatory system of gastropods Crop Ctenidium Digestive system of gastropods Diverticula Excretory system of gastropods Gastric shield Hancock's organ Hepatopancreas Hypobranchial gland Nephridium Nervous system of gastropods Nidamental gland Odontophore Oesophageal pouch Osphradium Reproductive system of gastropods Respiratory system of gastropods Sensory organs of gastropods
Other	Epiphragm Pseudofeces Torsion Circumesophageal nerve ring Trochophore Tyrian purple Veliger

Category:

Mollusc anatomy