摘要:

AbstractThe fiber diameter in the heart ofNecturus maculosusis not significantly different from that of other amphibian myocardial cells, averaging approximately 5 μ over most of its length and about 10 μ in the nuclear region. No transverse (T) tubular system was found. Instead, there were shallow invaginations of the sarcolemma and many pinocytotic vesicles at the periphery of the myocytes. Other intracellular membrane systems such as the Golgi apparatus and sarcoplasmic reticulum were also sparse and poorly organized. However, subsarcolemmal cisterns, specialized segments of the sarcoplasmic reticulum in close apposition with the sarcolemma, were clearly demonstrated. Nexal junctions were recognized at points of contact between myocytes, although they occupied smaller areas than those of mammalian myocardial cells. Mitochondria were small and few. Light cells with few organelles or myofibrils, which resembled Purkinje fibers of mammalian and avian hearts, were often observed. A nerve ending in close contact with muscle cells was describe

ISSN:0002-9106    

DOI:10.1002/aja.1001320402

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

年代:1971

数据来源: WILEY

摘要:

AbstractCyclic rats were unilaterally ovariectomized at random stages of the cycle between 66 to 72 days of age and killed on day 2 (metestrus) of the estrous cycle after three cycles, and after 3, 6 or 12 months. Control (intact) rats were also killed at these time periods.Counts of tubal ova revealed that intact rats ovulated an average of 5.3 eggs per ovary after three cycles (N = 7); 4.8 after three months (N = 12); 4.2 after six months (N =12) and 3.5 after 12 months (N = 2). Following unilateral ovariectomy, compensatory ovulation (11 eggs) occurred in all rats after three cycles (N = 10) and at three months (N = 11). Only four to five eggs were ovulated at six (N = 13) and 12 months (N = 4) after hemicastration. The remaining ovary in rats unilaterally ovariectomized after three cycles, or 3, 6 and 12 months hypertrophied 38%, 64%, 55% and 118%, respectively.Follicular development on the second day of the cycle was the same in intact and hemicastrated rats. The total number of follicles larger than 352 μ in diameter did not differ between three cycles and three months. By six months a 50% reduction occurred and the number of follicles remained the same after 12 months. This decrease in follicular development supports the finding of an absence of compensatory ovulation in the hemicastrated rat after 6 or 12 months

ISSN:0002-9106    

DOI:10.1002/aja.1001320403

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

年代:1971

数据来源: WILEY

摘要:

AbstractThe “Sternzellen” (von Kupffer, 1876) in the liver of normal animals and of those injected with excess vitamin A were examined with the light and electron microscopes. These cells were stellate perisinusoidal cells located in the space of Disse and were separated from the sinusoidal lumen by the endothelium. Their cytoplasm contained a number of lipid droplets which reacted intensely with gold chloride. These lipid droplets imparted intense vitamin A fluorescence under the fluorescence microscope. Following the administration of excess vitamin A, these lipid droplets increased remarkably. The “Sternzellen” were identical with cells described as “interstitial” or “fat‐storing” cells by others, and were quite different from the so‐called Kupffer cells of the liver reticulo

ISSN:0002-9106    

DOI:10.1002/aja.1001320404

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

年代:1971

数据来源: WILEY

摘要:

AbstractHarderian glands of female or castrated male hamsters contained scattered luminal pigment deposits and a single cell type. Two cell types were found in the glands from intact males. Glands from both male and female animals showed abundant cytoplasmic lipids. Pigment formation appeared to be endogenous and in some cases occurred by extrusion of cells from alveolar walls and their subsequent transformation. Holocrine secretion was demonstrable. Porphyrin concentrations in the glands from females were increased three weeks after bilateral blinding and decreased following hypophysectomy, ablation of one Harderian gland, unilateral blinding, treatment with thiourea or exposure to an environmental temperature of 8°C. Ovariectomy or ovariectomy plus treatment with 17‐α‐estradiol for three weeks had no effect on the Harderian glands nor did pinealectomy. Porphyrin concentrations in the glands from male hamsters were extremely low. Castration increased these concentrations over 100‐fold and modified the morphology toward that of the female while testosterone proprionate treatment prevented these changes. Administration of H3‐thymidine and subsequent radioautography revealed a peak in mitotic activity between 9:30PMand 12:30AMat the end of the light period or the beginning of the dark period. Longterm blinded or blinded, castrated males had Harderian glands which were microscopically “lacelike” due to intense

ISSN:0002-9106    

DOI:10.1002/aja.1001320405

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

年代:1971

数据来源: WILEY

摘要:

AbstractThe venous system of the canine brain was investigated by gross dissection and by radiographs. The system was divided into four major groups of vessels: cerebral veins, central veins, cerebellar veins, and pontomedullary veins.The dorsal cerebral veins emptied into the dorsal sagittal sinus and the ventral cerebral veins entered the dorsal petrosal or transverse sinus. The internal system of cerebral veins, and the central veins, were drained by the great cerebral vein which entered the straight sinus. Cerebellar and pontomedullary veins flowed mainly to the sigmoid sinus.The venous system of the dog differed from the human configuration in several ways. In the dog the major dorsal cerebral veins entered the dorsal sagittal sinus by independent lacunae in the same direction as the flow of blood. A middle cerebral vein was not present in the dog but was replaced by a continuation of the caudal ventral cerebral vein. There was a basal vein in the dog but its main flow of blood was to the dorsal petrosal sinus; in man, this vein passes to the great cerebral vein. The entire venous system of the brain was plexiform and collateral circulation was prominent. The larger veins were identified radiographically.

ISSN:0002-9106    

DOI:10.1002/aja.1001320406

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

年代:1971

数据来源: WILEY

摘要:

AbstractTo investigate the histochemical and microscopical characteristics of the lateral and maxillary glands, as well as their topographical relationship with the maxillary sinus, 25 adult specimens were used. The tissues were fixed in neutral buffered formalin and serial sections were stained with hematoxylin and eosin, trichrome, Sudan black B, ninhydrin‐Schiff, PAS, alcian blue, and mucicarmine. The objectives were to ascertain: (1) the general morphology of the lateral nasal wall and of the maxillary sinus, (2) the topographical relation between the glands and the maxillary sinus, (3) the microscopical and histochemical characteristics of the maxillary gland, and (4) the microscopical and histochemical characteristics of the lateral nasal gland. In all specimens, the sinus was surrounded by glandular tissue. The lateral gland occupied the submucosa anterior and inferior to the sinus, the maxillary gland extended from the anterior to the posterior recess superior to the sinus. The maxillary gland showed the typical morphology characteristic of a serous gland. The gland drained into the sinus by numerous excretory ducts. The epithelium of the proximal ducts was simple columnar and in the distal ducts, pseudostratified columnar ciliated. The latter type of epithelium, without goblet cells, was found in the maxillary sinus. The lateral gland showed a morphology characteristic of mucous glands. Although the gland contained neither free lipids nor proteins, it was PAS‐positive. A high concentration of acid glucoproteins was detected in the lateral gland. The excretory system of this gland was lined throughout by either a simple columnar or a simple cuboidal epithelium. The possible contribution of the glands to the functioning of the upper part of the respiratory system was discus

ISSN:0002-9106    

DOI:10.1002/aja.1001320407

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

年代:1971

数据来源: WILEY

ISSN:0002-9106    

DOI:10.1002/aja.1001320401

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

年代:1971

数据来源: WILEY