Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 349externomedial vein (ARTHRO: Insecta) 1. In Hymenoptera,the radius. 2. In Orthoptera, the media.externomedian nerve (ARTHRO: Insecta) The humeral anddiscoidal veins collectively.exteroceptors n.pl. [L. exterus, outside; capere, to take]Sense organs situated externally which respond to conditionsin the external environment, as opposed to interoceptors.extogenous see exogenousextra-axial skeleton (PORIF) Skeletal elements that surroundor arise from an axial region.extracellular a. [L. extra, outside; cellula, little cell] Pertainsto being outside of the cell but within the organism.extracellular digestion Digestion of food within a cavity ofthe digestive system.extraconic a. [L. extra, outside; Gr. konos, cone] Almost conical,but with concave sides. see coeloconoid.extracorporeal a. [L. extra, outside; corpus, body] Occurringoutside of the body.extracorporeal digestion A mode of feeding whereby someparasites and predators release esophageal or salivary secretionsinto the host or prey that predigests the internalcontents of the host or prey.extrados n. [L. extra, outside; F. dos, the back] The exteriorcurve of an arch. see intrados.extraembryonic a. [L. extra, outside; Gr. embryon, fetus]Outside the body of the embryo.extraembryonic field see serosaextraenteric a. [L. extra, outside; Gr. enteron, intestine] Outsidethe enteron.extranidal a. [L. extra, outside; nidus, nest] (ARTHRO: Insecta)In social insects, outside the nest or hive.extranuclear a. [L. extra, outside; nucleus, kernel] Structuresor processes found outside the nucleus.extraocular a. [L. extra, outside; oculus, eye] Away from orbeyond the eyes.