A course of dissections, for the use of students / [Herbert Mayo].

  • Herbert Mayo
Date:
1827
Catalogue details

Licence: Public Domain Mark

Credit: A course of dissections, for the use of students / [Herbert Mayo]. Source: Wellcome Collection.

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    muscular and tendinous fibres of the obliquus externus slant obliquely downwards and forwards; but that the posterior muscular fasciculi descend from the last rib to the crest of the ilium nearly vertically, and parallel to those of the latissimus dorsi, with which they are in contact. Notice the outer layer of cross tendinous fibres; the breadth of the tendon below, which slopes % with a concave margin to the crest of the ilium; its termination above in a tendinous expansion or aponeuro¬ sis covering the rectus; its three or four or five transverse white lines, the greater number above the umbilicus, marking the intersections of the rectus; and finally, its triangular aperture above the crest of the os pubis, called the external ring, which transmits the spermatic chord. 1. Origin of the Obliquus Externus. From the inferior margins of the eight lower ribs by eight fleshy slips, of which the five upper are attached below the origins of the serratus magnus, and the three lower below the costal attachments of the latissimus dorsi. Insertion. Into the ensiform cartilage, the linea alba, the crest of the os pubis, the ligament of Pou- part, and the external margin of rather more than half the crest of the ilium. Use. To diminish the depth and breadth of the abdomen; to depress the ribs; to incline the body for¬ ward and to the same side; and to rotate it towards the opposite. Separate the obliquus externus at its origin from the ribs; at its insertion from the crest of the ilium, and dissect the second layer of muscular fibres, which are remarkable for their contrary inclination to tliose
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