Human anatomy, including structure and development and practical considerations . Gut-tube ^ ?MX/ ^^^^^^^^^ ^^^^li^X^ Truncu AS^*|^ ^ \ Middle cerebral vesicle Anterior cerebral vesicle Pharyngeal membrane Oral recess (stoniodBeum)s arteriosusPericardial sac 0i Mi^tMv rimitive auricle Neural tube. fc^>^ ^;:5r».. Vy / Primitive ventricle _\ite]line duct Caudal pole (obliquelv cut) -^4s^ ~- - ^i^! i%-\^^ Sagittal section of early rabbit embryo, showing oral recess and primitive pharynx still separated. X 12. Formation of the Anus.—The posterior or caudal segment of the primitivegut-tube i
Human anatomy, including structure and development and practical considerations . Gut-tube ^ ?MX/ ^^^^^^^^^ ^^^^li^X^ Truncu AS^*|^ ^ \ Middle cerebral vesicle Anterior cerebral vesicle Pharyngeal membrane Oral recess (stoniodBeum)s arteriosusPericardial sac 0i Mi^tMv rimitive auricle Neural tube. fc^>^ ^;:5r».. Vy / Primitive ventricle _\ite]line duct Caudal pole (obliquelv cut) -^4s^ ~- - ^i^! i%-\^^ Sagittal section of early rabbit embryo, showing oral recess and primitive pharynx still separated. X 12. Formation of the Anus.—The posterior or caudal segment of the primitivegut-tube is the seat of the changes leading to the formation of the excretory the de\elopment of the anus was regarded largely as the repetition of aprocess similar to that leading to the communication between the oral recess and thefore-gut, an external depression {proctodcruin) being separated from the hind-gut byan ecto-entoblastic partition which later was broken down to form the anus, which wasconsidered a new structure. The studies of Gasser, Kupf!er, Bonnet, Hertwig, and others have emphasizedthe close relations between the anus and the blastopore. According to these investi-gations, the blastopore probably gives rise to two openings, an anterior and a former is
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Keywords: ., bookauthormc, bookcentury1900, bookdecade1910, booksubjectanatomy
