Embryo implantation in humans. After fertilization the human embryo begins a 4 day long journey down the fallopian tube and into the uterus. When the embryo reaches the blastocyst stage it develops two distinct populations of cells. The outer cell mass,called the trophectoderm, and the inner cell mass.
Cat eye glasses. Named after their resemblance to the shape of a cat's eye, cat eye glasses are probably the most popular style of vintage eyeglasses. Though cat eye glasses were around since the 1950's, they reached their peak popularity when Audrey Hepburn wore a pair in the 1961 film Breakfast at Tiffany's.
Common Eye Problems in Cats. As anyone who has woken up with a cat sitting on their chest and glaring at them can attest, cats are particularly good at expressing themselves through their gazes. Cats are very sneaky creatures, well-known to be experts at hiding signs of physical disease and distress. For this reason, these deep gazes can be an excellent opportunity to catch early signs of ocular disease in our feline companions. Eye Problems in Your Cat. Eye disease is a common problem in cats. But due to catsâ quiet nature, it is one that can be easily overlooked, according to Dr. Marcella Ashton, a veterinary ophthalmologist at the The Eye Clinic for Animals in Kearny Mesa, Calif.