. The American journal of anatomy . through the myocardium to their terminations or transitions intoheart muscle and perimysium respectively, states that the sheathseverywhere form a closed system and isolate completely the fas-ciculi from the heart muscle. From an examination of my speci-mens these statements are wholly confirmed, for even with thenaked eye, it was possible to find injection masses in some in-stances as far as fifteen millimeters in the myocardium. Fig. 2is a diagram of part of the left ventricular wall of beef heart , and illustrates this fact. Furthermore, it was possi
. The American journal of anatomy . through the myocardium to their terminations or transitions intoheart muscle and perimysium respectively, states that the sheathseverywhere form a closed system and isolate completely the fas-ciculi from the heart muscle. From an examination of my speci-mens these statements are wholly confirmed, for even with thenaked eye, it was possible to find injection masses in some in-stances as far as fifteen millimeters in the myocardium. Fig. 2is a diagram of part of the left ventricular wall of beef heart , and illustrates this fact. Furthermore, it was possible, by THE SHEATH OF THE BUNDLE OF HIS 65 securing serial sections of pieces of myocardium containing partsof the injected system, to trace on the one hand, the sheath withthe enclosed injection mass as far upward in the region of theKnoten as the connective tissue of the auricular muscle, and onthe other as far into the ventricular wall as the point of termina-tion of the Purkinje fibers, where the sheath becomes the * Fig. 3 Section showing two Purkinje fasciculi under the endocardium. A,endocardium; B, injection mass within connective tissue sheath; C, Purkinjefasciculus; D, connective tissues; E, cardiac muscle. X 275. For this microscopical work, pieces of tissue including parts ofthe injected system were taken from the different regions, ,from the region of the Knoten, from that of the main bundle,of the main branches, from the sub-endocardial anastomosis, andfrom the terminations within the myocardium. Paraffin andcelloidin were employed for embedding and the sections werestained with haematoxylin-eosin and van Gieson. Where thefasciculus had appeared as a definite strand in the gross, the micro- THE AMERICAN JOURNAL OF ANATOMY, VOL. 13, NO. 1 66 RUSKIN M. LHAMON scopic examination showed that the injection mass was entirelyheld within the connective tissue envelope. At points, thissheath had been dissected and separated around the entire cir-cumferenc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1912
