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.

    34/476 (page 28)
    bono, etc. Membranes ami entieular formations arise on tlie surface of cells which are arranged in rows, such as epi- thelia, through excretion from these and hardening of the excreted membrane, so that each cell does not have a crusta or membrane, but a common membrane develops, which can be isolat('d. A ty|ucal examjile of such a mem- brauous formation is the lens capsule. Whether the mem- brana propria of glands is to be regarded as an excretory product of gland-cells is still op(‘U to discussion. Struc- tiireless membranes mav arise from the fusion of cells, duriua: which process th(> nuclei of such cells may or may not disa])pcar. Membranes may also arise from the fusion of libers, th(* so-called fusion membranes. Elementary or fibrils an; very widely distributc'd; they arise for the most part as direct transformation products of cells (accord- ing to some investigators, from the homogeneous ground substance). They oc(!ur as the fibrillar elements of the con- nective tissue (the (lonnective-tissuc fibers), of the elastic tissue (the (>lastie. fibers). In the muscular tissues elemen- tary fibrils occur as muscle fibrilhe and in nerve-cells and n(*rve-libers as ueiirofibrils and as neuroglia fibers, the su|)porting tissue of the central nervous system. II. THE TISSUES OF THE HUMAN BODY. The meaning of the term tissue cannot be defined with- out (jualification. Tn general we designate as tissues those structui’es which ai’e comj)Osed of equal or similar cells arranged in a certain definite oi’der and ]iossessing a sim- ilar function. J>y a stri(;t iutcrjiretation of the histogen- esis of tissues we are forced to recognize but two chief types: (1) The ei)ithelial tissues; (2) the eonneclive tissues (iiH'senehyme). Basing our subdivision on a fune- tional dilfercntiation of these two chief types of tissues, w(; may r(‘cognize two other divisions; these are the mus- cular and the nervous tissues ; the latter is of ej)ithelial