cinereum

The second layer of gray matter in the anterior corpora quadrigemina, sometimes described as the nucleus, s. convolutum. An important layer of large pyramidal cells seen in a section through the hippocampus major. It is prolonged into the pes hippocampi, its free border forming the point of the uncus. s. corneum (epiderm i dis). The true epidermis; the corneous or most superficial layer of the epidermis, consisting of transparent flattened cells, closely packed together and devoid both of nuclei and of granules, s. cutaneum.