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.

    24/476 (page 20)
    roe;arcl(“(l as inclosurcs or transformation jirodncts of the |)rotoplasin. Tims, in many cells, especially in gland- cells at (Ik? time ot secretion, are found larger or smaller grannies, so-called zijmnf/ni granule.^, which are looked upon as products of metamorphosis of the protoplasm into the special secretion of the gland (see ])age 35). Most ganglion-cells contain in their protoplasm large grannies or Hakes, which show aninity to basic dyes, which proba- bly also have to do with the metamorphosis of the cells and arc known as _r//’n»H7c.s (see page 73). Other cells contain in their ])rotoplasm a varying mimbcr oi' fat ilropI(‘t.'<, which at times may till the greater portion of the cell, as in the cells of adipose tissue (see page 52). The droj)s of sebum in the sebac(‘ons glands of the skin show a similar relation, since in their formation they lie in a pro- toplasmic meshwork. ddie meshwork of the ])rotoplasm is, how(!V(‘r, in this (?ase secondary; it develops only through the formation of the secretion. Other c('ll inclosnres arc the ])igiiicnl granules; these are smaller or larger grannies, generally yellow, brown, or black in color, and of irrcgnlar form. Now and then crystalloid structures oc(;nr in the proto])lasm of many cells, known as crgsta/loids or protein ciystals, and may resnlt from the crystallization of the albnminons substance. (See Plate 4, Fig. 2.) Such strnctnres have been observed in man in the epithelium of the lens and in the interstitial cells of the testis. The outermost layer of the cell protojdasm, in which the mitom threads arc generally coarser and more closely woven, frequently becomes condensed to form a S])ccial strnctnre, known as the cell membrane; this can, in typical cases, be separated from the cell. It is generally strnctim'- less. In some instamies the ])cri|)heral, dillerentiated layer of the protoplasm of the cell gradually changes to the ordi- nary protoplasm. In these cases wc s]ieak of a crusfa. The cell nucleus is a vesienlar striietnrc of very varia- ble shape, lying in the interior of the cell. As a general