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.

    23/476 (page 19)
    CELL PROTOPLASM. so-o:ill(‘(l pscu(l()]io(lia, tliese cells may not only move, hut also take up solid substances sncli as particles of dust, bacteria, etc.; two processes surrounding the solid body may How togetlier and thus inclose the foreign body in the cell. In other cells certain differentiated portions of the ])ro- toplasm are endowc'd wdth motion, as the cilia of ciliated cells and i\w flagella of the spermatozoa. In contradis- tinction to the ameboid movement, the ciliary motion is continuous and follows a certain law, in that the cilia move always in a c('rtain direction and create a continuous cil- iary current.^ The cell protoylasm presents a very (H)inplex driicfurc, concerning which, even at the present time, the views of writers arc widely at variance. According to the view HOW most generally accepted, ])rotoplasm presents a fibrillar .structure, the Hbrils varying in size and arranged in the form of a reticular network ; this is readily demonstrated in many cells. These Hbrils of the protoplasm constitute the rnitom, sjrmf/iojilasrn, or i\\c flhrillar 7nars. Within this thread-like stru(;ture, which is visible only with hinh or ' V O with very high maguitication, are scattered miuute gran- ules, ob.scrved more especially at the nodal ])oints of the network; these are known as micrommc.'<. 'fhat ])ortion of the cell ])roto])lasm not oc(;u])ied by the Hbrillar struc- ture and the microsomes must bo regarded as a fluid or semi-fluid sul)staucc, the inlnjihrillar substance, or the hyalopla.s-m. ^ III addition to these structures which occur throughout the jirotoplasm, structures an; often found wliich are to be * Tlie sfM-allid molecular motion, a dancing motion of tine f;riinnles in fluids, is notan active motion. It(M-<jnrs in tlie i)roto))lasm of the s.'divarv corpuscles, dead, swollen lenk(K-ytcs, and also in ^ninnies of India ink suspended in a fluid, eUe ^ .tceordin*; to some ohservers, the ])roto])la.sm consists of ffrannles which, if arrantjed in rows, may form threads. Ae<'ordiiif{ to an idea which is aeec|)tcd by few and is .scarcely worthy of helief, the ])roto- plasm is composed of .separate honeycomb-like si)aces (foam theory).