Aplasia cutis congenita is a rare disorder characterized by congenital absence of skin. Calcinosis cutis is associated with systemic sclerosis. The adjective cutaneous means "of the skin" (from Latin "cutis", skin). The adjective cutaneous literally means "of the skin" (from Latin "cutis", skin). The integumental bones in the Crocodilia originate in the connective tissue of the cutis. Cutis laxa is associated with deficient or absent elastin fibers in the extracellular matrix. Cutis verticis gyrata is a medical condition usually associated with thickening of the scalp. The skin is involved about 10% of the time in the form of leukemia cutis. Stipitipellis is a cutis (parallel hyphae not embedded in a gelatinous matrix). Tenericutes (tener cutis&colon; soft skin) is a phylum of bacteria that contains the class Mollicutes. Pileipellis types include the cutis, trichoderm, epithelium, and hymeniderm types. Calcinosis cutis is a type of calcinosis wherein calcium deposits form in the skin. Cutis marmorata also occurs in decompression sickness (DCS). In many cases, cutis laxa is inherited. The condition was first reported by Jean-Louis-Marc Alibert in 1837, who called it "cutis sulcata".