| Worm, Ole | <person> Danish anatomist, 1588-1654. See: wormian bones. (05 Mar 2000) |
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| worm-shell | <zoology> Any species of Vermetus. Source: Websters Dictionary (01 Mar 1998) |
| primary screw-worm | An obligatory screw-worm that can penetrate normal tissues and feed as a primary invader. The important myiasis flies of man that serve as p. Screw-worm's are Cochliomyia hominivorax, Chrysomyia bezziana, and Wohlfahrtia magnifica. (05 Mar 2000) |
| herring-worm disease | Infection with roundworms of the genus anisakis. Human infection results from the consumption of fish harboring roundworm larvae. The worms may cause acute nausea and vomiting or may penetrate into the wall of the digestive tract, where they give rise to eosinophilic granulomas in the stomach, intestine, or the omentum. (12 Dec 1998) |
| screw-worm | The larva of the botfly, Cochliomyia hominivorax, and other similar forms that cause human and animal myiasis. (05 Mar 2000) |
| screw worm infection | Infection with larvae of the blow fly cochliomyia hominivorax (callitroga americanum), a common cause of disease in livestock in the southern and southwestern u.s.a. (12 Dec 1998) |
| secondary screw-worm | An accidental or facultative screw-worm that enters a prior wound or suppurated condition and feeds on infected rather than intact tissues. Many blowflies are included, such as Calliphora vicina, Phaenicia sericata, Phormia regina, Cochliomyia macellaria, Chrysomyia species, and other fleshflies. (05 Mar 2000) |
| fleece worm | The larva of one of several species of blowflies which deposit eggs on sheep, causing myiasis. Synonym: fleece worm. (05 Mar 2000) |
| abapical pole | In an ovum, the pole opposite the animal pole (i.e., vegetal pole). (05 Mar 2000) |
| animal pole | <cell biology> In most animal oocytes the nucleus is not centrally placed and its position can be used to define two poles. That nearest to the nucleus is the animal pole and the other is the vegetal pole, with the animal vegetal axis between the poles passing through the nucleus. During meiosis of the oocyte the polar bodies are expelled at animal pole. In many eggs there is also a graded distribution of substances along this axis, with pigment granules often concentrated in the animal half and yolk, where present, largely in the vegetal half. (12 Nov 1997) |
| anterior pole of eyeball | The centre of the corneal curvature of the eye. Synonym: polus anterior bulbi oculi. (05 Mar 2000) |
| anterior pole of lens | The central point on the anterior surface of the lens of the eye. Synonym: polus anterior lentis. (05 Mar 2000) |
| vegetal pole | Of vertebrate eggs. The surface of the egg opposite to the animal pole. Usually the cytoplasm in this region is incorporated into future endoderm cells. (18 Nov 1997) |
| vegetative pole | The part of a telolecithal egg where the bulk of the yolk is situated. (05 Mar 2000) |
| germinal pole | <cell biology> In most animal oocytes the nucleus is not centrally placed and its position can be used to define two poles. That nearest to the nucleus is the animal pole and the other is the vegetal pole, with the animal vegetal axis between the poles passing through the nucleus. During meiosis of the oocyte the polar bodies are expelled at animal pole. In many eggs there is also a graded distribution of substances along this axis, with pigment granules often concentrated in the animal half and yolk, where present, largely in the vegetal half. (12 Nov 1997) |