... roof of the yolk-sac; and (4) the cloacal membrane. These elements form the epithelial linings of the ... its floor is formed in part by the cloacal membrane. The cloaca is later divided, in the frontal ...

... caudal end of the primitive streak forms the cloacal membrane. The extension of the mesoderm takes place throughout ... and entoderm come into apposition and form the cloacal membrane. The blastoderm now consists of three layers, named ...

... Allantois, am. Amnion (tail-fold), c. Cloaca, m. Cloacal membrane, n. Notochord. r. Rectum, s. Spinal cord. y. Wall ... or, as it is now sometimes called, the cloacal membrane (Fig. 171). It consists, as will be recalled, ...

... out into the ventral mesentery. Iden- tify the cloacal membrane, where entodem of hind- gut is fused with ... the relations of the yolk stalk, allantois, and cloacal membrane. What is Meckel’s diverticulum? What is the urachus? ...

... entodermal cloaca; 4, rectum; 5, anus; C.M., cloacal membrane; U.G., urogenital sinus; A, mesoblast at junction ...

... reference to the levelopmcnt of the mesoderm and cloacal membrane. .1. Anat., Lond., 1933, 67: 263-76.—Hafferl, ...

... far as the latter is represented by the cloacal tive membrane ; the allantois secures embry- brane, in part it ...

... The branchial lamella, formed by the united lining membranes of the pharyngeal and cloacal cavities, is traversed by an extension of the ... only attained as embryonic development advances; for the cloacal sac, which ... two contiguous membranes, one aperture is formed after another, until the ...

... and abdominal Viscera in a female foetus with cloacal formation. (One-third Life-size). (After Vrolik, op. cit. Plate 22/ a.a. The internal membrane of the enclosing sac is the peritoneum. b. ...

... bowel and urogenital sinus end in a common cloacal opening; later, separation between the bladder and urethra ...