摘要:

A quantitative study was carried out on the adult cat optic nerve near the eyeball by systematically measuring the perimeters of all the axons seen through the optic microscope. The main purpose of this study was to define the topographical distribution of these axons in function of their size. Statistical studies show the existence of an area of maximal concentration of large axons in crescent form situated in the temporal zone of the nerve. The neurophysiological implications are discussed.

ISSN:1422-6405    

DOI:10.1159/000145136

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

54 healthy cats were studied. In almost all cases, two types of degenerative signs could be seen: in the primary optic pathways, but also in the posterior funiculi and the spinalcerebellar tracts, lesions of wide-diameter axons seen by their initial demyelination, accompanied by intense neurogJial reactions, and, on the other hand, a Wallerian degeneration of smaller axons situated in the axial part of the nerve. The percentage of these abnormalities must still be evaluated. Their eventual consequences and nature are discussed.

ISSN:1422-6405    

DOI:10.1159/000145137

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

This study shows that significant changes in the pattern of glycogen deposition are brought about by irradiation with 2,000 R gamma-rays. The sharp fall during the 1st week can be attributed to its emergent mobilization. However, glycogen stored in the liver during the 2nd and the 3rd week prior to the resorptive process substantiates the fact that tadpoles complete metamorphic transformations in spite of sublethal irradiation.

ISSN:1422-6405    

DOI:10.1159/000145138

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

(1) The veins of the human cerebellum, which may be classified into internal and external venous channels, correspond, in this respect, to the veins of the cerebral hemispheres. (2) The external cerebellar veins are arranged in three groups which, in turn, correspond to the three cerebellar surfaces and which communicate extensively. Accordingly, the terminal segments of the cerebellar veins overlap, which implies that no one-to-one relationship exists between the mouths of the individual veins and their respective distributions.(3) The terminal segments of the cerebellar veins are the superior petrosal sinus, the tentorial venous sinuses, the great vein of Galen and the internal vertebral plexus.(4) The tentorial venous channels may form a collateral venous arrangement.(5) The internal cerebellar veins consist of the nuclear veins and the medullary veins.(6) The medullary veins form a cortex-perforating group and a group located in the basal medullary region. The latter form a venous arborization of blood vessels not described thus far. This group of veins opens chiefly into the vein of the lateral recess of the fourth ventricle.(7) Attention is called to a ‘venous watershed’ corresponding to the one that exists in the cerebral hemispheres.(8) The veins of the dentate nucleus are composed of several venous channels draining its external surface and one single vein draining its internal surface. The latter has not been described thus far. The external veins of the dentate nucleus open into the venous star and the cortex-perforating veins. The internal nuclear vein, on the other hand, emerging from the hilum of the dentate nucleus, runs along the superior cerebellar peduncle. Thus, the term ‘vena centralis nuclei dentati’ appears to be appropriate to designate this vessel. It ultimately opens into the precentral cerebellar vein.(9) In certain places, various-colored substances used for injection form mixe

ISSN:1422-6405    

DOI:10.1159/000145139

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

The changes in the veins of a lymph node in experimental pericarditis appear together with those in the organ tissues and characterize the morphodynamic process.

ISSN:1422-6405    

DOI:10.1159/000145140

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

The thickness of the manubrium, the width and thickness of the body of the sternum at the level of second intercostal space as well as the thickness of the spongiosa and outer and inner compact layers have been measured in 67 human cadavers. Consequently, it is recommended that sternal puncture be made at the level of the second intercostal space in the adult and at the manubrium in children. Depth of puncture should not exceed 4 mm. Sternal puncture can thereby be done with greater confidence of avoiding penetration of the sternum, a potentially serious complication.

ISSN:1422-6405    

DOI:10.1159/000145141

出版商:S. Karger AG    

年代:1979

数据来源: Karger

摘要:

The spinal cord along with the ventral and dorsal roots (C1-S4) were dissected out in 10 male and 5 female CF rats. The vertebral levels of origin and exit of the spinal nerve roots and termination of the spinal cord were recorded. It was observed that from the midcervical to the sacral region, the roots arose increasingly at cranial levels compared to their levels of exit. This disparity was at its maximum in the lumbar and sacral segments. The spinal cord terminated between the third and fourth lumbar vertebrae. There was no sexual dimorphism either at the level of termination of the cord or at the levels of origin and exit of the various nerve roots.

ISSN:1422-6405    

DOI:10.1159/000145142

出版商:S. Karger AG    

年代:1979

数据来源: Karger