File:Lineback1920 fig02.jpg

From Embryology

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Fig. 2. Sagittal section of a human fetus 46 mm CR. length

(No. 95, Carnegie Collection), showing the presence of longitudinal muscle fibers (the circular muscle is not drawn).

The ventral portion of the muscle extends only as far as the pelvic cavity, while the dorsal fibers extend well into the abdominal region.

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