6.1 Composition of the Integument (Chapter 6 Integumentary System)

Cutaneous membrane

- also know as skin

Chapter 6. Integumentary System (heading)

NA The integument is the body's largest organ and is composed of all tissue types that function in concert to protect internal body structures. Its surface is covered by an epithelium that protects underlying body layers. The connective tissue that underlies the epithelium provides strength and resilience to the skin. This connective tissue also contains smooth muscle associated with hair follicles (arrector pili) that alters hair position. Finally, nervous tissue detects and monitors sensory stimuli in the skin, which provide information about touch, pressure, temperature, and pain. The integument accounts for 7% to 8% of the body weight and covers the entire body surface with an area that ranges between about 1.5 and 2.0 square meters (m2). Its thickness ranges between 1.5 millimeters (mm) and 4 mm or more, depending on body location. The integument consists of two distinct layers: a layer of stratified squamous epithelium called the epidermis, and a deeper layer of primarily dense irregular connective tissue called the dermis (figure 6.1). Deep to the dermis is a layer of areolar and adipose connective tissue called the subcutaneous layer, or hypodermis. The subcutaneous layer is not part of the integumentary system; however, it is described in this chapter because it is closely involved with both the structure and function of the skin

Notes for lab practical

Table 1.2 1.3 1.4.. pp 153 table 1.2 pp154 1.54 table 5.4/ table 5.6 pp 157/ table 5.7 and 5.8 pp168 and 169.. pp 171 5.9 .5.10... pp 174 table 5.11 and 5.12 pp 175.. parts of the microscope.. stages of mitosis.. pp 142 and 143.. as far the slide goes itself.. anything you see lable.. start in table 5.2 154

integumentary system

consists of the skin and its derivatives: nails, hair, sweat glands, and sebaceous (oil) glands. We are most conscious of this highly visible body system because it characterizes our self-image and reflects our emotions. Our skin is a barrier to the outside world and is subjected to trauma, harmful chemicals, pollutants, microbes, and damaging sunlight. It usually remains strong and pliable, is easily cleaned, is self-renewing, and is a visual indicator of our physiology and health. Changes in the color of the skin may reflect body disorders or anomalies; skin changes or lesions sometimes reflect systemic infections or disease

Integument

is the skin that covers your body.

dermatology

study and treatment of the integumentary system