Exam 2 Review:  Chapter 5:  Dermal Histology

dermis - The sensitive (innervated) dense irregular fibrous connective tissue layer of the skin located below the epidermis, containing nerve endings, hair follicles, sweat and sebaceous glands, and blood and lymph vessels.

papillary region - The superficial ~20% of the dermis, between the epidermis and the reticular region, which consists of highly vascular loose (areolar) connective tissue; named for the presence of the dermal papillae which increase the surface area of contact with the epidermal basal layer to facillitate nutrient and waste exchange between the two tissues.

dermal papillae - The series of bulges of the papillary region of the dermis of the skin increase the surface area under the epidermis to facilitate diffusion of nutrients, oxygen and wastes between the basal layers of epidermal cells and the blood.

reticular region - the deeper ~80% of the dermis, beneath the papillary region, which consists of dense irregular connective tissue.

corpuscles of touch - A group of specialized sensory receptors composed of a relatively rounded globular mass of cells, located in the dermis, or rarely the epidermis, which respond to varying degrees of mechanical pressure or vibrations.

tactile corpuscle = Meisner's corpuscle - An exteroreceptor located in the dermal papillae, especially in sensitive hairless areas such as the palms of the hands, soles of the feet, and nipples; a small receptor consisting of a few spiraling sensory terminals surrounded by Schwann cells and a thin egg-shaped connective tissue capsule; they are receptors for light or discriminative touch.

lamellated corpuscle = Pacinian corpuscle - An exteroreceptor scattered deep in the dermis and subcutaneous tissues; a large receptor consisting of a sensory dendrite surrounded by layers of flattened cells and layers of collagen fibers forming an egg-shaped capsule; they are receptors for vibration.

List:

 6. four cellular sensory structures found in skin and their specific sensory functions.

Sketch and label, etc.

2. an illustration of the skin to the depth of the deep fascia; include the internal structures present.