Atlas and epitome of human histology and microscopic anatomy / by Johannes Sobotta ; edited, with extensive additions, by G. Carl Huber.

  • Sobotta Johannes, 1869-1945.
Date:
1903
Catalogue details

Licence: In copyright

Credit: Atlas and epitome of human histology and microscopic anatomy / by Johannes Sobotta ; edited, with extensive additions, by G. Carl Huber. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    25/476 (page 21)
    CELL NUCLEUS. rule, the form of the nucleus accommodates itself to tlie form of the cell; thus very long, narrow cells have elon- gated nuclei. The most varied forms of nuclei arc, how- ever, met with; they may be nearly or quite spherical, many arc ellipsoid, and in certain cases they are distinctly lohnlatcd or ring-shaped, or the nuclei arc indented or com- pressed on one or several sides, so that a polynuclear effect may be ])roduced. In certain cases two or more nuclei mav be found in a .sinr/Ie cell (in many leukocytes, giant- cells of the bone-marrow, occasionally in livcr-cells, gang- lion-cells, etc.). The nucleus is essentially the reprodneUve organ of the cell. Non-nneleated cells (see ]iage 18) are therefore incapable of division. The cell nucleus contains complex chemical constituents, which, according to their reaction to staining reagents, arc divisible into two clas.ses, known as the chromatic and the achromatic nuclear con- stituents. The most im])ortant of these chemical constit- uents of the nucleus is i\w chromatin, chemicallv nuclein,^ which is regarded as that ])orti(»n of the cell which trans- mits the hereditary characteristics. It presents itself in ditferent forms according to the state of activitv of the nucleus (see ])age 22); usually, however, in the form of strands or threads, which fre(piently anastomose' and show thickenings at tlu' nodal |)oints. The chromatin is sup- ported by the achromatic substance, the (inin, which, in the form r>f very line threads, forms a dense netwoi-k in the interior of the nuck'iis. In this network we lind the true nuclear cor|)Uscles or nnctro/l, which consist of a chro- matic siibsttinee (chemically iml uueleiu, but paramiclein). d’he nucleus is always, except during the process of mu'lcar • livi-ion, siirnMinded l»y a unclear mnnhranc, consisting of an achroniiitie >ub.'t:uiee, timpliipyrinin. 'The space within ’ Tlic ossential vital |)iii|)frtics of tlic ('liromatiii ane iioti nm'.ssiirilv to the (cliciiiical I nuclein, since nncicin is fonml in jiortions of the body \\ licrc tlicrc is no cliromal in. Tin- clicinical and the anatotnio concept.s of nuclein are not identical.