. A system of anatomy for the use of students of medicine (Volume 1). ge of the tenth rib. Here its tendondivides into two layers; the anterior layer, with a great portionof the inferior part of the posterior layer, joins the tendon of theexternal oblique, and runs over the rectus to be inserted into thewhole length of the linea alba. The posterior layer joins thetendon of the transversalis muscle as low as half way betweenthe umbilicus and os pubis; but, below this place, only a fewfibres of the posterior layer are seen, and the rest of it passesbefore the rectus muscle, and is inserted into
. A system of anatomy for the use of students of medicine (Volume 1). ge of the tenth rib. Here its tendondivides into two layers; the anterior layer, with a great portionof the inferior part of the posterior layer, joins the tendon of theexternal oblique, and runs over the rectus to be inserted into thewhole length of the linea alba. The posterior layer joins thetendon of the transversalis muscle as low as half way betweenthe umbilicus and os pubis; but, below this place, only a fewfibres of the posterior layer are seen, and the rest of it passesbefore the rectus muscle, and is inserted into the linea alba ; sothat the whole tendon of the external oblique muscle, with theanterior layer of the internal oblique, passes before the rectusmuscle; and the whole posterior layer of the internal oblique,together with the whole tendon of the transversalis muscle, ex- 304 ABDOMINAL MUSCLES. cepting at the inferior part, passes behind the rectus, and is in-serted into the linea alba. At its undermost part, it is insertedinto the forepart of the os pubis. Fig. 20.*. Use. To assist the former; but it bends the trunk in the re-verse direction. 3. Transversalis,Arises, tendinous, but soon becoming fleshy, from the inner orback part of the cartilages of the seven lower ribs, where someof its fibres are continued with those of the diaphragm and theintercostal muscles; by a broad thin tendon, connected to thetransverse processes of the last vertebra of the back, and the foursuperior vertebras of the loins; fleshy, from the whole spine ofthe os ilium internally, and from the tendon of the external ob-lique muscle where it intermixes with some fibres of the inter-nal oblique. * Transverse section of abdomen.—a, Division of the tendon of the internaloblique into two layers, forming a sheath in which is contained the rectus , External oblique, c, Internal oblique, d, Transversalis. e, Between the lastrib and the crista of the ilium, the fibres of the transversalis, arise from a
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