Innervation and Lymphatic Drainage

The abdominal wall is composed of nine layers. From outward in they are: (i) skin, (ii) subcutaneous tissue, (iii) superficial fascia (Scarpa's fascia), (iv) external abdominal oblique muscle, (v) internal abdominal oblique muscle, (vi) transversus abdominis muscle, (vii) transversalis fascia, (viii) extraperitoneal adipose tissue, and (ix) peritoneum.

The muscular abdominal wall is composed of three flat muscles (external oblique muscle, internal oblique, and transversus abdominis) and one strap-like muscle (rectus

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