Читать книгу Ridley's The Vulva - Группа авторов - Страница 114

The dermis lies below the epidermis and above the subcutaneous fat. It has two layers: the papillary dermis and the reticular dermis. The upper papillary dermis projects upwards into the rete ridges and is composed of fine collagen fibres, running at right angles to the surface, together with reticular and elastic fibres. This arrangement supports vascular and lymphatic channels as well as nerve endings. The lower reticular is composed of coarse collagen fibres lying parallel with the surface. Thicker elastic fibres accompany the collagen fibres to prevent it being overstretched. In the perineal area, smooth muscle fibres similar to those seen in the nipple, penis, and scrotum are also present. The vascular and lymphatic plexuses that drain the papillary dermis lie within the reticular dermis, which also contains the nerve fibres associated with the papillary nerve terminals.