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Species variations:dog
1.3.7 Retroperitoneal fascia
falciform
1.3.8 Parietal peritoneum
This peritoneal layer lines the whole abdominal wall. It is a largely transparent and delicate layer that is reflected as mesenteries that are continuous with the visceral peritoneum that covers the abdominal viscera. The peritoneum comprises an outer layer of simple squamous epithelium called the mesothelium and is supported by a layer of loose connective tissue.
1.4 The Sheath of the Rectus Abdominis Muscle (ssss1a–c)
ssss1 Transverse sections through the ventral body wall to show the species variation in the sheath of the rectus abdominis. (a) The horse, (b) the ox and (c) the dog (caudal third of abdomen only).1 = parietal peritoneum; 2 = transverse abdominis muscle; 3 = interior oblique abdominis muscle; 4 = exterior oblique abdominis muscle; 5 = yellow abdominis tunic; 6 = skin; 7 = rectus abdominis muscle; 8 = linea alba; 9 = ventral sheath of rectus abdominis muscle
The aponeuroses of the external, internal and transverse abdominal oblique muscles together form a sheath that encloses the rectus abdominis muscle either side of the midline of the abdominal wall. There are species differences and, in the dog, variations in the craniocaudal location.