Nutmethee Kruepunga

1 INTRODUCTION It is generally accepted that the early embryonic gut consists of three subdivisions: a foregut cranially, a hindgut caudally and a midgut in between. The foregut, in turn, consists of two segments: the pharynx and the caudal foregut. The midgut is the part of the gut that has a roof and two sides, but no floor, because ventrally its lumen is directly continuous with the yolk sac.

1 INTRODUCTION The (female) external genitals are located in the perineal region of the body. The perineal region consists of a urogenital triangle ventrally and an anal triangle dorsally. Recently, several new descriptions of the anatomy of female external genitals have become available (Abdulcadir et al., 2020; Haylen et al., 2017; O'Connell et al., 2004; Puppo & Puppo, 2015), but they mostly concern adult anatomy.