摘要:

AbstractThe morphology of the circulatory system of Amphioxus (Branchiostoma lanceolatum(Pallas)) has been investigated using a new intravascular injection technique. A survey of the vessels of Amphioxus using this technique is given. The dorsal arteries and their ramifications are described in detail. The new injection technique brought to light myoseptal plexi, supplied from the dorsal arteries, between every two myomeres. Also the ventral parietal arteries have a much more complicated course than hitherto accepted. They are connected with an atrial plexus which is a continuous net of small vessels in the whole length of the dorso‐lateral wall of the atrial cavity. It is postulated that this plexus has a supplementary function in respiration. Plexi of minute vessels in the gonads and a real blood circulation with afferent and efferent gonadal vessels have been demonstrated. Two vessels connecting the liver plexus with the cardinal vein (or the atrial plexi) have been noticed, the v. communicans accessoria anterior mentioned in 1900 by Burchardt, and a so‐called oblique vessel never described before. The vessels of the caudal region are analyzed completely and also here a real blood circulation appears possi

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1979.tb00594.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe abdominal vertebrae of the adult carp retain a bulk of cartilage at the basement of the haemapophyses. This cartilage has two opposite directions of differentiation. There is an enchondral ossification of the hypertrophic calcified cartilage in its distal area whereas its proximal area is calcifying without previous hypertrophy. The calcification of this proximal area (hyaline calcified cartilage) is permanent and shows typical rings and waves of Liesegang. The calcification of the cartilage of the hemapophyses is of a globular type. The hyaline calcified cartilage is not a metaplastic bone. Other studies, specially with electron microscope, will allow us to understand the innermost process of the different stages of calcification in the cartilage of the carp.

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1979.tb00595.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe photophores of the presumably mesopelagic deep‐sea teleostThysanactis dentexare described. The entire chin barbel and the isolated first pectoral fin ray and its filaments contain aggregations of photocytes of the same type as those present in the body‐photophores and the limbus‐photophores of the eyeball. The chin barbel and the first pectoral fin ray are consequently thought to be lum

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1979.tb00596.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractTwo LDH isoenzymes are present in the swimming muscles ofChimaera.The axial muscle, consisting almost exclusively of white fibres, has most of the slow‐migrating isoenzyme, while pectoral muscle, rich in red fibres, have most fast‐migrating isoenzyme. The LDH activity is not visibly affected by 2 M urea, but is nearly extinguished by 4 M u

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1979.tb00597.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

AbstractThe pineal gland of normal and experimental female mink has been studied by light‐, fluorescence‐ and electron microscopy. The general structure of the mink pineal is described. Two main cell types are recognized. One, termed pinealocyte, predominates in number. Though slight morphological differences (e.g. electron density of the cytoplasm and content of organelles) were observed, this study indicates that the pineal of mink only contains one single population of pinealocytes. The other, termed glial cell, inserted between the pinealocytes, is characterized by the presence of elongated processes, containing microfilaments. Different treatments (ovariectomy and LH—RH administration) and different endocrine states during the year induced morphological changes in the pinealocytes. A rich network of nerve fibres containing electron‐dense granules (40–50 nm) is observed. Microspectrofluorometrically these fibres exhibit the spectral characteristics of cateholamines. All the pinealocytes show a yellow fluorescence. This cellular fluorophor shows the same microspectrofluorometric characteristics as does the fluorophor of serotonin. Occasionally, synaptic ribbons are observed in the perikaryon and the processes of the pinealocytes. A large number of cellular junctions between pinealocytes and endothelial cells is present. Their presumed function(s) are discussed. There is evidence of a blood‐brain barrier within the mink p

ISSN:0001-7272    

DOI:10.1111/j.1463-6395.1979.tb00598.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY