. A manual of zoology. Zoology. 74 GENERAL PRINCIPLES OF ZOOLOGY. Simple Epithelium. â Exclusively one-layered epitlielia are foiuul ill all iiivertebrated animals and in Ampliioxus; in the vertebrates, on the other hand, they are limited to the internal cavities of the body, and even here are occasionally, as always in the skin, replaced by a many-layered epithelium. According to. Fig. 2!") âVinous forms of epithelia. a, flattened epithelinm of Sifcandra rapli( 11/ in cross section, n" in siirfaoe view; b and r, ruboidal and columnar epithe- lium of i moUusf (Haliiiti.^ tvfirrf
. A manual of zoology. Zoology. 74 GENERAL PRINCIPLES OF ZOOLOGY. Simple Epithelium. â Exclusively one-layered epitlielia are foiuul ill all iiivertebrated animals and in Ampliioxus; in the vertebrates, on the other hand, they are limited to the internal cavities of the body, and even here are occasionally, as always in the skin, replaced by a many-layered epithelium. According to. Fig. 2!") âVinous forms of epithelia. a, flattened epithelinm of Sifcandra rapli( 11/ in cross section, n" in siirfaoe view; b and r, ruboidal and columnar epithe- lium of i moUusf (Haliiiti.^ tvfirrfiihitti); J, :ell;Ucd epithelium of an actinian (('nUi<if li-^ }Kii(i^ttua\; r, ciliated epithelium fi-oiu the intestine of the f resh-water mussel, / ( pithelium (c) with cuticle (ci of <'i)' cnrniialit.^ (a wasp). the shape of the cells we distinguish cuboidal or pavement, flat, and columnar epithelium. In the case of pavement epithelium (fig. 25, ti) the cells are all developed about equally in all direc- tions of space, and because tliey have become compressed by lateral pressure have the appearance of cubical blocks or paving- stones. In columnar epithelium the long axis, the distance from tile deeper to the peripheral end of the cell, is especially great (fig. 25, (â ); finally, in flat or squamous epithelium this is greatly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
