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The primordial pouch, sometimes referred to as "spay sway" by owners who notice it once the cat has been spayed or neutered, is hereditary in some cats. It is located on a cat's belly. Its appearance is similar to a loose flap of skin that might occur if the cat had been overweight and had then lost weight.
Pharyngeal pouches form on the endodermal side between the arches, and pharyngeal grooves (or clefts) form from the lateral ectodermal surface of the neck region to separate the arches. [8] In fish, the pouches line up with the clefts, and these thin segments become gills .
Kangaroo joey inside the pouch Female eastern grey kangaroo with mature joey in pouch. The pouch is a distinguishing feature of female marsupials and monotremes, [1] [2] [3] and rarely in males as well, such as in the yapok [4] and the extinct thylacine. The name marsupial is derived from the Latin marsupium, meaning "pouch".
A pouch is present in most, but not all, species. Many marsupials have a permanent bag, whereas in others the pouch develops during gestation, as with the shrew opossum, where the young are hidden only by skin folds or in the fur of the mother. The arrangement of the pouch is variable to allow the offspring to receive maximum protection.
Ileum, caecum and colon of rabbit, showing Appendix vermiformis on fully functional caecum The human vermiform appendix on the vestigial caecum. The appendix was once believed to be a vestige of a redundant organ that in ancestral species had digestive functions, much as it still does in extant species in which intestinal flora hydrolyze cellulose and similar indigestible plant materials. [10]
Primordial elements, elements formed before the Earth came into existence; Primordial narcissism, the psychological condition of prenatal existence; Primordialism, the argument which contends that nations are ancient, natural phenomena; Primordial (band), Irish heavy metal band; Primordial (roller coaster), a roller coaster at Lagoon in ...
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Root primordia (brown spots) as seen on the butt of a freshly cut pineapple crown intended for vegetative reproduction.. A primordium (/ p r aɪ ˈ m ɔːr d i ə m /; pl.: primordia; synonym: anlage) in embryology, is an organ or tissue in its earliest recognizable stage of development. [1]