Textbook of normal histology: including an account of the development of the tissues and of the organs . A, cell from pancreas of salamander: n,nucleus ; J>, paranucleus. B, sexual cell ofleech : n, nucleus ; /, paranucleus ; c, centro-some. (After Platner.) Segmenting ova of asrarismegalocepliala : n, nucleus ;a, centrosome, surroundedby attraction-sphere ; p, po-lar body. (After Boveri.) nucleus, to which the name accessory nucleus, or paranucleus(yNcbenkern of the Germans), has been applied. According to Plat-ner, the paranucleus is an extrusion of the nucleus, and is subject togreat var
Textbook of normal histology: including an account of the development of the tissues and of the organs . A, cell from pancreas of salamander: n,nucleus ; J>, paranucleus. B, sexual cell ofleech : n, nucleus ; /, paranucleus ; c, centro-some. (After Platner.) Segmenting ova of asrarismegalocepliala : n, nucleus ;a, centrosome, surroundedby attraction-sphere ; p, po-lar body. (After Boveri.) nucleus, to which the name accessory nucleus, or paranucleus(yNcbenkern of the Germans), has been applied. According to Plat-ner, the paranucleus is an extrusion of the nucleus, and is subject togreat variation in size and appearance; the nature and function ofthis body are at present still obscure, and need further , the presence of a very small, round, highly-refractingbody—the centrosome, or pole-corpuscle—has been establishedwithin the nucleus of sexual and other cells. The centrosome isitself surrounded by an area named the attraction-sphere. Whilethese bodies have been shown to exist during the condition of rest,it is especially in connection with the changes incident
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Keywords: ., bookauthorpiersolgeorgeageorgea, bookcentury1800, bookdecade1890
