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The coelom is the mesodermally lined cavity between the gut and the outer body wall. During the development of the embryo, coelom formation begins in the gastrulation stage. The developing digestive tube of an embryo forms as a blind pouch called the archenteron. In protostomes, the coelom forms by a process known as schizocoely. [6]
In the development of the human embryo, the intraembryonic coelom (or somatic coelom) is a portion of the conceptus forming in the mesoderm during the third week of development. [1]
The gestational sac is spherical in shape, and is usually located in the upper part (fundus) of the uterus.By approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of the gestational sac, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...
Coeloma is an extinct genus of crabs belonging to the family Mathildellidae. The genus includes 19 species, [ 2 ] distributed among several subgenera, and is in need of revision. [ 1 ] The fossil record of the genus extends from the Eocene to the Miocene .
The tape recorder is a British-made Boosey & Hawkes "Reporter", [7] but the source of the image has not been identified. The view through the window is a widely reproduced photograph of the exterior of a cinema in 1927 showing the premiere of the early " talkie " film, The Jazz Singer starring Al Jolson ; the actual original source of the image ...
This process was repeated until the house was complete. Window, skylight, and door openings were cut and the frames foamed into place. Finally, the interior of the entire structure was sprayed with a 3 ⁄ 4 inch (1.9 cm) coating of fireproof material that also provided a smooth, easy-to-clean finish for walls and ceilings. The exterior was ...
The Southern Wall is 922 feet (281 m) in length, and which the historian Josephus equates as being equal to the length of one furlong (Greek: stadion). [1] Herod's southern extension of the Temple Mount is clearly visible from the east, standing on the Mount of Olives or to a visitor standing on top of the Temple mount as a slight change in the plane of the eastern wall, the so-called ...
The city is known to be surrounded by wide inner walls made of earthwork and moats. In the 1974 edition of the Guinness Book of Records, it described the Benin City walls as the largest earthwork carried out before the Mechanical period. [1] Part of the walls were believed to be about 65 ft (20 m) tall. [2]