摘要:

A scanning and transmission electron microscope study of blastocysts immediately prior to ovo implantation and of antimesometrial implantation sites was conducted. External membranes of the eggs showed at 6 days post coitum the imprint of the endometrial surface, pointing to the early establishment of contact between egg and uterus. At 7 days the antimesometrial region showed flattening with continued evidence of gland openings that appear to be the elective sites of attraction of the trophoblastic knobs. Attachment of the trophoblastic knobs followed on days 8 and 9.

ISSN:1422-6405    

DOI:10.1159/000145671

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The distribution of serotonin-containing neurons in the brain of the dog was studied by use of PAP immunohistochemistry. The lower brain stem was endowed with extensively scattered serotonergic cell bodies, a large portion of which was located in the raphe nuclei. At the same time, prominent distribution of serotonergic neurons in lateral areas outside the raphe nuclei was also demonstrated. Our observations on the brain stem were, in principle, consistent with those on rats, cats and monkeys, with only minor differences.

ISSN:1422-6405    

DOI:10.1159/000145672

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

23 human fetal diaphragms were used to study the structural changes of the phreno-oesophageal membrane at the different prenatal ages. 2 human adult diaphragms were used for comparison. This membrane was found to be formed by both the superior and inferior diaphragmatic fasciae. The phreno-oesophageal membrane was mainly formed by the superior fascia at early stages of development and by the inferior at later ages. The collagenous and elastic components of this membrane increased gradually with age. The crural muscle fibres forming the boundary of the oesophageal hiatus at 10 weeks showed gradual regression and was replaced by tendinous fibres. The latter formed secondary insertion in addition to the primary one in the central tendon. The strip of striated muscle, which was occasionally present at the lower end of the oesophagus, could be attributed to failure of recession of the crural muscle bordering the hiatus. The functional significance of the phreno-oesophageal membrane in the process of deglutition and vomiting and for prevention of hiatus hernia is discussed.

ISSN:1422-6405    

DOI:10.1159/000145673

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

Electron-microscopic examination of rats renal glomeruli revealed that Zlábek’s thin intercapillary anastomoses (TIAs) are thin vessels which interconnect the ordinary glomerular capillaries, while branching off abundantly. The lumens of the TIAs are irregular, mostly closed, frequently cleft-like; the width of lumens is about 0.9–0.1 µm. The TIAs are situated in the intercapillary (mesangial) areas of renal glomeruli; they represent a special equipment which probably influences the glomerular plasma flow rate and the glomerular ultrafiltr

ISSN:1422-6405    

DOI:10.1159/000145674

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

This study was designed to assess the possible genetic determinants of neurosensitivity to early (neonatal) phenobarbital (PhB) administration and to conduct a strain comparison for the cerebellar histology of both inbred and outbred mice. HS/Ibg, C57BL/10 and DBA/1 pups were injected with 50 mg PhB/kg daily on neonatal days 2–21. On day 50, treated animals (B) of all strains had smaller brains than controls (C). Moreover, the cerebellar area was decreased in HS and C57 B mice but not in DBA mice, suggesting genotype-environment interaction. B mice from all strains had similar Purkinje cell losses. Strain comparison showed that control C57 mice had smaller brains than control HS, and DBA had smaller brains than both HS and C57. Similarly, C57 had smaller cerebellar layers than HS and DBA had smaller cerebellar layers than both HS and C57. DBA and C57 mice had fewer Purkinje cells than HS but did not differ from each othe

ISSN:1422-6405    

DOI:10.1159/000145675

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The muscular coat of human small intestine is constituted by a ‘special’ layer, by the main component of the circular layer, by the region between the circular and the longitudinal layers and by the longitudinal layer. The ‘special’ layer is made up of the innermost 4–6 rows of muscle cells of the circular layer and is separated from the main component of the circular layer by a space in which an abundant connective tissue and numerous nerve fibers rich in nerve endings are located. Cells identified as interstitial cells of Cajal are located inside the ‘special’ layer, the space between it and the main component of the circular layer and in the region between the circular and the longitudinal layers. In this region small bundles of obliquely orientated muscle cells, apparently bridging the circular to the longitudinal lay

ISSN:1422-6405    

DOI:10.1159/000145676

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The adaptability of one indigenous and four exotic breeds of pigs to the humid tropical climatic conditions of Ibadan was comparatively evaluated with acetylcholinesterase activity (AChE) of brain and hypophyseal parts as the parameter. Significant breed differences were observed in the weight and AChE of the hypophyses and in the AChE of the brain parts. With regard to sex, only the relative adenohypophyseal weight and the AChE of the cerebellum and medulla oblongata were influenced. The results demonstrate the greater adaptability of the indigenous pigs to their native environment than the exotic breeds. A reduced sensitivity to the various stressing factors of the indigenous pigs and the females was implied. Results also suggest that the Large White breed may be more suited to the conditions prevalent in Ibadan than the other exotic breeds.

ISSN:1422-6405    

DOI:10.1159/000145677

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

Cross-sections of 17 sciatic nerves were examined by an image analyzer as to sum of fibre carrying cross-sectional areas and by light-microscopic visual area sampling as to myelinated and unmyelinated fibre densities. Intra-perineural cross-sectional areas range from 3.5 ×106 to 7.6 ×106 µm2 with a mean of 5.8 ×106 in the 12 male subjects and 3.4 ×106 to 4.0 ×106, x = 3.7 ×106 µm2 in 4 mature females. Estimates of total fibre content range from 6.1 × 104 to 1.6 × 105 in the males and 6.1 × 104 to 9.2 × 104 in these female subjects. Variations in axon number totals and in ratios of myelinated to unmyelinated fibre densities are not age correlated. Variations also occur in the diameter distributions of myelinated fibres and in ratios of small to large diameter myelin

ISSN:1422-6405    

DOI:10.1159/000145678

出版商:S. Karger AG    

年代:1983

数据来源: Karger

摘要:

The study of the intrinsic innervation of the oesophagus in dogs revealed the presence of capsulated ganglia and scattered neurons in the upper and lower thirds of the organ. The cells were either oval or pyriform with multiple dendrites and ill-defined capsules of pericellular satellites. Furthermore, muscle spindles were detected amidst the obliquely set muscle fibres of the oesophageal muscular coat. Simple motor and plates supplied the striated extrafusal muscle fibres. The submucous nerve plexus contained no ganglia. Its nerve fibres extended to form periacinar and intra-acinar axons to the oesophageal submucous glands. Subjacent to the mucosa, the subepithehal nerve plexus gave intraepithelial free terminals that penetrated the basement membrane to end within the stratified epithelium just beneath its cornified layer.

ISSN:1422-6405    

DOI:10.1159/000145679

出版商:S. Karger AG    

年代:1983

数据来源: Karger