. The anatomical record. Anatomy; Anatomy. STRUCTURE AND FUNCTION OF SMALL INTESTINE 197 quickly dissected, making an annular gap of about 1 inch. By making two longitudinal incisions, one along the mesenteric and the other opposite the mesenteric attachments through the inner spiral coat, the latter may be quickly dissected from the outer coat. The gut is then rein verted to its normal position (fig. 2). After a quick, clean dissection and if the excitabiHty of the mus- culature is still present, a satisfactory demonstration may~be made (figs. 2 and 3).. Fig. 2 This represents a segment of th
. The anatomical record. Anatomy; Anatomy. STRUCTURE AND FUNCTION OF SMALL INTESTINE 197 quickly dissected, making an annular gap of about 1 inch. By making two longitudinal incisions, one along the mesenteric and the other opposite the mesenteric attachments through the inner spiral coat, the latter may be quickly dissected from the outer coat. The gut is then rein verted to its normal position (fig. 2). After a quick, clean dissection and if the excitabiHty of the mus- culature is still present, a satisfactory demonstration may~be made (figs. 2 and 3).. Fig. 2 This represents a segment of the gut from which the inner spiral coat was exsected between a and h. The arrow is directed caudad. Fig. 3 This represents a peristaltic wave in relation to the area of exsection of the inner close spiral muscle coat, a' designates the cephalic constriction. From a' to h' depicts the caudal dilatation. This bulging immediatelj^ evident is due to the outer elongated muscle layer. A stimulus applied to the muscle layers of the gut will produce two effects due to the different directions of the muscular fasciculi. The reacting contraction wave of the inner coat will pursue a rotary course, whereas that of the outer coat will pursue a translatory course. Therefore, the cephalic constriction produced by the contraction of the stronger inner coat is bound to trail the caudal dilatation produced by the outer coat. Stimulating by pinching or by inserting a vaselinated cotton bolus or by means of the induction current, a peristaltic wave may be started above the annular exsected area. The dilatation is immediately detected below the stimulated spot and constric- tion above. It is definitely evident by direct observation that the outer muscle coat contracts in advance of the inner muscle coat as the constriction nears the annular area of exsection. The constriction due to the stronger inner coat is cephalad or proximal to the area of exsection, at the same time that the outer muscle. Plea
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1906
