atrium oris

atrium oris
(ARTHROPODA: Crustacea)
The preoral cavity.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • atrium oris — Preoral cavity, bounded ventrally by posteriorly directed labrum, dorsally by ventral surface of cephalon just behind mouth, and laterally by paragnaths and mandibles [Moore and McCormick, 1969]. Preoral cavity, bounded ventrally by posteriorly… …   Crustacea glossary

  • labrum — A bulbous structure lying next to the epistome and bordering the anterior margin of the oral opening. (Syn. upper lip) [Holdich and Jones, 1983]. An unpaired, flat segment of the cephalon that articulates with the clypeus, and anteriorly covers… …   Crustacea glossary

  • mandible — Most anterodorsally situated of gnathal appendages; one, of a pair, of heavily calcified jaws; the teeth. [Hobbs and Jass, 1988]. On of the heavily calcified jaws lying anterior to (beneath, in ventral view) the other mouth parts but visible in… …   Crustacea glossary

  • mouth — (Order Cladocera): Anterior opening of digestive tract under labrum; opens into esophagus [Stachowitsch, 1992]. (Order Notostraca): Anterior opening of digestive tract on underside of head; located under labrum and opening into esophagus… …   Crustacea glossary

  • molar process — (Syn. incisor process) [Butler, T.H.]. A medial process of the mandible. In the plesiomorphic condition, it has a broad, distal, triturating surface with circumgnathal denticles, a posterior row of broad, setulate setae, and sensory pores on the… …   Crustacea glossary

  • incisor process — Biting portion of gnathal lobe of mandible. (Syn. pars incisiva) [McLaughlin, 1980]. Biting portion of gnathal lobe of mandible. (Syn. pars incisiva) [Moore and McCormick, 1969]. Cutting process on mandible; widely separated from molar or… …   Crustacea glossary

  • paragnath — See: labium, metastoma [Martin, 2005]. A pair of ventral projections of the cephalic cuticle just posterior and medial to the mandibles. Each projection has two lobes, a broad lamellar outer lobe with hair like setae on the inner margins and a… …   Crustacea glossary

  • Outline of human anatomy — See also: Index of anatomy related articles Human anatomy, a branch of anatomy, is the scientific study of the morphology of the adult human. It is subdivided into gross anatomy and microscopic anatomy. Gross anatomy (also called topographical… …   Wikipedia

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • List of anatomical topics — This page aims to list articles related to anatomy. This list is not necessarily complete or up to date if you see an article that should be here but isn t (or one that shouldn t be here but is), please update the page accordingly. NOTOC A… …   Wikipedia

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