ANAT 025 Lecture Notes - Lecture 3: Dense Irregular Connective Tissue, Dermis, Smooth Muscle Tissue
Document Summary
Consists of areolar and dense irregular connective tissue. These ct layers of the integument are composed of cells of the ct proper and primarily of collagen fibers, although both elastic and reticular fibers are also present. Other components of the dermis include blood vessels, sweat glands, sebaceous glands, hair follicles, nail roots, sensory nerve endings, and smooth muscle tissue. Two major regions: superficial papillary layer and deeper reticular layer. Superficial region of the dermis directly adjacent to the epidermis. Contains projections of the dermis toward the epidermis called dermal papillae. The dermal papillae interlock with deep projections of the epidermis - epidermal ridges. Epidermal ridges and dermal papillae increase area of contact between the epidermis and dermis and connect these layers. Each dermal papilla contains the capillaries that supply nutrients to the epidermis. Deeper portion of the dermis that extends from the thin, overlying papillary layer to the underlying subcutaneous layer.
