[Cells of the conduction pathways of the human bundles of His. Histoenzymologic and ultrastructural study].
A human His bundle was studied two hours after death by histoenzymological techniques and electron microscopy. The pathway had a much higher cholinesterase activity than the working myocardium, due to its richness in nerve endings: this was confirmed by electron microscopy which also distinguished "common" contractile cells (working cells) from P type and "intermediary" cells; those were by far the most common, presenting an ultrastructure identical to that of the Purkinje cells, classically described in the bundle branches alone. These findings and the unique longitudinal architectural organisation of the His bundle, confirm the studies of JAMES and may explain the rapidity of conduction in this structure.
D000135:Acid Phosphatase / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism; D000469:Alkaline Phosphatase / Q000378:metabolism; D002036:Bundle of His / Q000166:cytology* / Q000201:enzymology / Q000648:ultrastructure; D002091:Butyrylcholinesterase / Q000378:metabolism; D006329:Heart Conduction System / Q000166:cytology*; D006801:Humans; D008854:Microscopy, Electron
D002091:Butyrylcholinesterase; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase; D000251:Adenosine Triphosphatases
Les cellules des voies de conduction dans le faisceau de His humain. Etude histoenzymologique et ultrastructurale.