摘要:

The structure of the nerve fibres in the chronically isolated cat ileum was studied by fluorescence and electron microscopy after 5,6-dihydroxytryptamine (5,6-DHT) treatment. Residual fluorescence rapidly disappears after administration of 5,6-DHT. Under the electron microscope, degeneration of most of the nerve processes containing a special population of 120-to 140-nm diameter granular vesicles could be observed. Also the degeneration of presynaptic terminals in the local ganglia was observed frequently. Some degenerating nerve fibres were found in the inner muscular layer, in the connective tissue surrounding Lieberkühn’s glands, and in the stroma of the villi. The axons (and/or other nerve processes) undergoing degeneration are assumed to belong to the serotoninergic neurons of the local ganglia. A substantial number of nerve cell processes remaining intact after 5,6-DHT treatment contain different population of vesicles: either 30- to 60-nm agranular and 100- to 120-nm granular vesicles or 30- to 60-nm agranular and 160- to 200-nm diameter neurosecretory type vesicl

ISSN:1422-6405    

DOI:10.1159/000144782

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

A histochemical study of mucopolysaccharides in the dog spinal cord and dorsal root ganglia is reported in this paper. The histochemical techniques used were the following: PAS, colloidal iron, toluidine blue (pH 5.4 and 3.5), thionine (pH 5.4 and 3.5) and alcian blue 8GX (pH 1 and 2.5). Some histological stains were used also. Two types of neurons could be observed in spinal cord sections stained with colloidal iron techniques. In some neuron a border line of mucosubstances could be seen. In the dorsal root ganglia, different patterns of Nissl bodies distribution in neurons were described. This different distribution of Nissl bodies is associated with different metachromatic colorations of neurons. By using the colloidal iron method, two types of neurons were also revealed in the dorsal root ganglia: some neurons are of a yellow, small-sized and star-shaped type and others are of a light green, larger and round-shaped type. Mucosubstances in the endoneurium and perineurium of nerve fibers, in the Ranvier nodules and in the Schmidt-Lantermann incisures were observed. The possibility that the functional rhythm in some cases might be responsible for the difference in coloration between the dorsal root ganglia neurons is suggested.

ISSN:1422-6405    

DOI:10.1159/000144783

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

From a study of four Caucasoid population samples, aged 1–20 years, a linear relationship was established between stature and jaw or limb growth. However, the correlations between the various parameters varied between the different samples, which suggested that caution must be applied to the interpretation of growth dat

ISSN:1422-6405    

DOI:10.1159/000144784

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The phase-optic study of the germinal cells from the testes of the hedgehog, a seasonally breeding mammal, reveals the multinucleate giant cells in the natural state in late August, at the beginning of winter regression without subjecting these animals to any type of experimental stress. The participation of primary spermatocytes and spermatogonia, in addition to spermatids, in the formation of these giant cells has been observed. The nuclei at similar stage of spermatogenesis are identifiable in a single giant cell. The possible mechanism of their formation is discussed.

ISSN:1422-6405    

DOI:10.1159/000144785

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The progressive lymphoepithelial development of the rabbit appendix was examined by light and electron microscopy. At 5 days postnatally, the appendix wall primitively resembles the mature organ but lacks both the discrete lymphoid organization and most cell types. The dome appears to be the first recipient of lymphoid cells. By 18 days the lymphoid nodule has become compartmentalized and lymphoid. The epithelium, although not fully developed, is in contact with the lymphocytes of the dome. The 5-week-old appendix has all the lymphoepithelial components of the adult but lacks the size of the mature organ. At all ages reported, plasma cells and dendritic cells are absent. Bacteria, thought to be essential to appendiceal lymphoid development, are not apparent at 5 or 18 days. The features common to central or peripheral lymphoid tissues are discussed.

ISSN:1422-6405    

DOI:10.1159/000144786

出版商:S. Karger AG    

年代:1977

数据来源: Karger

摘要:

The growth of the human vertebral canal and the spinal cord during normal fetal development was studied. The results suggest that these two parts of the developing body exhibit a similar developmental pattern. Computer analysis also revealed that the rate of this parallel growth is considerably lower than that of the body as a whole but similar to that reported for the brain. These results are discussed in relation to the pathogenesis of certain neurological diseases.

ISSN:1422-6405    

DOI:10.1159/000144787

出版商:S. Karger AG    

年代:1977

数据来源: Karger