Cirumvallate Placenta. Page Links: Definition, Outcome, Screening, References. Definition. Circumvallate placenta refers to a thickened marginal rim of tissue around the chorionic (fetal) surface of the placenta forming a âwall,â which is composed of amnion, chorion, decidua and fibrin. The overall incidence is in the range of 1% to 2%.
âJane Hawk, the compelling heroine of The Silent Corner, returns in another terrifying Dean Koontz conspiracy thriller, The Whispering Room. . . . The character of Jane Hawk is arguably the best character Koontz has created. Knowledge of The Silent Corner helps put some of the narrative in perspective, but itâs not necessary to fall under the authorâs spell.
White hawk. The white hawk (Pseudastur albicollis), a bird of prey breeding in the tropical New World, belongs to the family Accipitridae. Though it is commonly placed in the subfamily Buteoninae, the validity of this group is doubtful and currently under review.