摘要:

AbstractThe nature of Henle's rings, which are the highly refractile constricting fibers seen around chemically swollen collagen, has long been in dispute. Several theories can be found in the literature to account for this phenomenon. Henle's rings were abundant in oxhide and calfskin, but were rarely seen in human skin. They did not stain with any of the common elastic tissue stains. Reactions of Henle's rings, collagen fibers, and elastic fibers in purified hexosamine‐free collagen of oxhide, fresh calfskin, fresh human abdominal skin, and ligamentum nuchae were compared using microscopic heat reactions both before and after chemical enzymatic treatment. Solutions used were 50% glycerin, glacial formic acid, 1 N NaOH, 0.1 N acetic acid, 3 N acetic acid, elastase, collagenase, pepsin, and hyaluronidase. The conclusions reached were that Henle's rings are not elastin, mucoid, or protoplasmic in nature but closely resemble a nonswelling collagen, probably reticulin. Henle's rings are very rare in human skin, but after digestion with elastase or treatment with NaOH, long, curving, poorly swelling fibers are seen which react like collagen in other respects. Henle's rings in oxhide varied in diameter from 24 μ up to several hundred microns. They seemed to be made up of fine fibrillae as seen with the phase‐contrast microscope. The fluorescent colors of Henle's rings with various filters differed from the fluorescent colors of elastic fibers. Attempts to stain them with silver were not succes

ISSN:0003-276X    

DOI:10.1002/ar.1091540302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractThe ovarian histology ofParascaptor leucurus, the white‐tailed mole, is very similar to that ofTalpa europeaa, especially with reference to the presence of two zones: (1) an ovigerous, or female, zone, and (2) an interstitial‐cell, or male‐like, zone. The ovigerous zone contains the follicles and corpora lutea. This pole of the ovary only is covered with a germinal epithelium. The interstitial‐cell zone is made up entirely of islands of interstitial cells and of very short testis‐like tubules, the so‐called medullary follicles.Follicular growth appears to follow the conventional mammalian pattern.Sections of the medullary follicles have an appearance very similar to those of seminiferous tubules of late fetal and early postnatal testes in cellular make‐up and relation to the rete tubules.Evidence is presented that suggests the occurrence of delayed implantation

ISSN:0003-276X    

DOI:10.1002/ar.1091540303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractThe fine structure of frog tadpole melanophores has been found to be different from that of teleost chromatophores (Falk and Rhodin, '57). The cytoplasm is not divided into inner and outer regions. Organelles are distributed throughout the cytoplasm. A special search for microtubules was made and only a single such structure could be found.

ISSN:0003-276X    

DOI:10.1002/ar.1091540304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractOn the dorsum of the Japanese dormose tongue three circumvallate papillae are arranged in an inverted V‐shape. Foliate, fungiform and filiform papillae are also observed. The vallate papillae and the outer wall of the trench are covered with highly cornified stratified squamous epithelium. The taste buds in six rows are located only in the lateral wall of the papilla, having a long taste canal. Ganglion cells lie on the nerve bundles extending into the papilla. Serous glands are plentiful deep in the muscles and their ducts open into the bottom and on the outer wall of the trench. The foliate papillae consist of six to seven folds furnished with taste buds. The serous glands are developed also in this region. The lamina propria of the dorsum is richly supplied with abundant nerves ending free. The fungiform papillae are also supplied with abundant nerves and furnished with taste buds penetrating into the connective tissue. The inferior surface is poor in nerve supply and has neither taste buds nor papillae. The muscle spindle, the thin‐sheathed sensory corpuscle and a peculiar wavy‐coursed end‐apparatus within the nerve bundle are found in the apical region. The dormouse tongue contains many ganglion cells along the nerve

ISSN:0003-276X    

DOI:10.1002/ar.1091540305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractFixation ofFunduluserythrocytes by silver acetate‐osmium tetroxide solutions preserves marginal band microtubules while extracting the obscuring hemoglobin background. High magnification electron micrographs of thin sections show the microtubules to be composed of globular subunits. Cross‐sectional profiles of the microtubules contain six or seven subunits. The discussion includes comments as to the general stability of microtubular structures, and to the similarities between microtubules and tobacco mosaic virus prot

ISSN:0003-276X    

DOI:10.1002/ar.1091540306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractPeriosteal appositional bone formation in human ribs was analyzed. Tetracycline labels depositedin vivoreveal that in human ribs there can be continued apposition of periosteal bone after age 20, which decreases in amount with advancing age but is still present in the seventh decade.

ISSN:0003-276X    

DOI:10.1002/ar.1091540307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractThis communication presents the first electron micrographs known to us of human gall bladder mucosal epithelium. These cells are typical of epithelial cells in general. They possess microvilli, terminal bars, desmosomes, membrane interdigitations, Golgi apparatus, mitochondria, granular and agranular endoplasmic reticulum, and a nucleus limited by an envelope interrupted by pores and containing one to several nucleoli. Of particular interest are the three types of granular inclusions found in the cytoplasm.These granules are discussed in the light of their possible significance, in particular their possible relation to the functioning of this epithelium in a gall bladder exhibiting cholelithiasis.

ISSN:0003-276X    

DOI:10.1002/ar.1091540308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractA saturated solution of 20‐methylcholanthrene in benzene was applied to the ear and trunk of 59 BALB mice. The effects upon cutaneous innervation were compared with that of 50% turpentine in acetone (13 mice) and of skin abrasion with sandpaper (11 mice). Silver impregnation techniques showed that the carcinogentreated epidermis was invaded by nerve fibers whose number was related to the degree of epidermal hyperplasia, but not to the period of treatment or to the animals' age at the time of first painting. Hair follicles showed changes in the size, number and length of nerve endings. Growth of cutaneous nerves was already evident on the fourth day of exposure to methylcholanthrene. Turpentine elicited only a slight neural reaction after 60 days; and the sandpaper treatment was without effec

ISSN:0003-276X    

DOI:10.1002/ar.1091540309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractA time study of the incorporation of tritiated thymidine into the thymus of Fischer rats ranging from 15 days to one year of age has been made. The data obtained from both autoradiographic and histological analyses indicate that the mitotic activity in the thymus of young animals is much higher than in old animals. The medium thymocyte, by virtue of its higher relative proliferative capacity, is responsible for the greater portion of cellular production during the intense pre‐pubertal growth phase of the thymus. A decrease in proliferative capacity of medium thymocytes occurs between 60 and 90 days of age, which appears to initiate the onset of age involution of the thymus. The data further indicate that small thymocytes are cells which do not undergo divisio

ISSN:0003-276X    

DOI:10.1002/ar.1091540310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY

摘要:

AbstractGonadal and perirenal fat pads from markedly obese mice show pathological changes associated with the appearance of many large macrophages, small mononuclear cells resembling lymphocytes, and polymorphonuclear cells. The first recognizable changes are always associated with necrosis of the fat cell membrane. Advanced stages also show reduction of the number of fat cells, formation of large fat vacuoles and cysts, and predominance of innumerable pathological cells. The extent of tissue changes varies considerably even within one fat pad but is dependent on the degree and duration of obesity. Animals weighing less than 45 gm are only occasionally, heavier mice almost regularly, affected. The nitrogen content of normally healthy adipose tissue decreases as the animals grow older and fatter, while fat pads exhibiting tissue pathology show the expected increase in the protein and water content, and a reduction of the lipid content. The pathological changes were observed in obese‐hyperglycemic mice, in several strains of mice made obese by the administration of goldthioglucose, and in four old and very fat controls. These four controls were the only ones in several hundred normal mice examined which showed changes. Few and only minor pathological changes were noted in subcutaneous fatty tissue of mice which showed marked pathology of the abdominal fat pad

ISSN:0003-276X    

DOI:10.1002/ar.1091540311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1966

数据来源: WILEY