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The atrio-ventricular (A-V) node of the monkey heart is located in the focus of converging atrial muscle. Three main atrial muscle strands, coming from the atrio-ventricular ring, the dorsal wall of the atria, and the ventral part of the atrial septum, converge in the nodal region where they overlap and are interconnected. The junctional type of fibers(More)
Photoreceptor cells in the epidermis and nerve branches of the prostomium and in the cerebral ganglion of Lumbricus terrestris were investigated with the electron microscope. The photoreceptor cell is similar to the visual cell of Hirudo by having a central intracellular cavity (phaosome) filled with microvilli. Besides microvilli, several sensory cilia can(More)
Horse-radish peroxidase injected into the femoral vein of intact rats, or infused at 30 cm H2O pressure into the main pancreatic duct of intact dogs, entered easily the interstitial spaces surrounding acini and acinar cells. The latter are interconnected at their luminal segments by zonulae occludentes. These junctions form a barrier to tracer penetrating(More)
In the sino-atrial (S-A) node of the monkey heart two types of muscle cells occur: 1. typical nodal cells which are the predominant cells and form the nodal fibers. 2. “Intercalated clear cells” with various diameters (4 to 12 μm) and containing poorly developed myofibrils, rich in glycogen and demonstrating poor staining properties. These latter cells are(More)
Intravenous injection of hexadimethrine bromide in rats causes necrosis of the anterior pituitary. As early as after half an hour there is dilatation of the vessels, slight intravascular fibrin precipitation, rupture of the vessel walls, and leaking of plasma into the spaces between the parenchymal cells. At one hour, platelets accumulate around the small(More)
The ultrastructure of liver cells was studied in three groups of bats (Myotis myotis) captured in March. 1. Hibernating animals: The liver cells contain much glycogen and large mitochondria, poorly developed ER, relatively well developed Golgi apparatus, various amounts of lysosomes. Most of the bile canaliculi are closed. 2. Non-hibernating, starving(More)
In order to clarify the early phenomena involved in the lung reaction to hyperoxia, twenty adult male rats were exposed to 100% oxygen at 1 ATA. Morphological pulmonary lesions were detectable after only 24 h hyperoxia, and included vasoconstriction and perivascular oedema, bronchiolar constriction, and pericyte reaction. The lesions were irregularly(More)
The formation and differentiation of the endoplasmic reticulum (e.r.) have been studied electronmicroscopically on rats for 1, 2, 3, 4 as well as for 10 and 20 days following subtotal hepatectomy. On the first postoperative day hydropical and fatty degeneration, swelling, disorganization and distribution of the e.r. was observed. Contemporaneously with the(More)
L'étude au microscope électronique des éléments nerveux intracardiaques et des rapports musculo-nerveux dans le coeur de rat nous a montré un certain nombre de particularités: 1. Dans les ganglions nerveux du sulcus terminalis, on trouve des cellules particulières proches des éléments chémorécepteurs du corpuscule carotidien. Des cylindraxes renflés(More)
Le système vecteur montre une différenciation morphologique plus ou moins accusée selon ses diverses parties. Les modifications musculaires sont les plus marquées dans le nœud de Keith-Flack. Les fibres vectrices se rapprochent ensuite progressivement des fibres communes. Le nœud de Tawara est caractérisé par une intrications d'éléments musculaires et(More)
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