Simple squamous epithelial tissue

Stratified squamous epithelial tissue

Simple cuboidal epithelial tissue

Stratified cuboidal epithelial tissue

Simple columnar epithelial tissue

Pay attention to how many cells there are. *BONUS* Name that cell… 8. 7. Pseudostratified Ciliated Columnar Epithelial Tissue *Bonus – Goblet Cell

Adipose connective tissue

Areolar connective tissue

Reticular connective tissue

The Integumentary System

Functions of the Integumentary System Protection Body temperature regulation Dilation Constriction Sweat gland secretions Cutaneous sensation Metabolism

Three major regions

Cells of the Epidermis Keratinocytes Melanocytes Langerhans’ cells Merkel cells

THICK vs THIN skin

Epidermis Five layers: Stratum corneum: dead cells; keratin dominate cells; can become thick from irritation Stratum lucidum: Present in thick skin only, dead cells Stratum granulosum: cells dying; begin keratinization Stratum spinosum : living cells, keratin generation Stratum basale: youngest cells; specialized cells present

Dermis Strong, flexible connective tissue Cell types: fibroblasts macrophages mast cells white blood cells Composed of two layers – papillary and reticular

Hypodermis Energy storage Highly vascularized

Skin Color Three pigments contribute to skin color Melanin Carotene yellow to reddish-brown to black pigment Freckles and pigmented moles Albinism Carotene yellow to orange pigment Hemoglobin reddish pigment

Fingerprint Characteristics

Integumentary Accessories

Sweat Glands Eccrine glands sweat Apocrine glands Ceruminous glands Mammary glands sweat odor wax milk

Sebaceous Glands All over except… Androgen Sebum Functions: Lubrication Waterproofing Complications…

Nails Keratin Consist of: Growth - 0.5 mm/week Free edge Body Lunula* Root Cuticle Growth - 0.5 mm/week  fingernails faster than toe nails …why?

Hair Filamentous strands of dead keratinized cells Functions? Hint…there are 6 Locations 2 types Vellus Terminal

Hair Follicle Regions: Shaft Root Medulla (inner) Cortex (outer) Cuticle (cover)

Hair Thinning and Baldness Androgenic alopecia – hair thinning in both sexes True (frank) baldness Genetically determined Sex-influenced condition Male pattern baldness Hair thinning

Rule of Nines Figure 5.8a

Melanoma Melanomas typically have the following characteristics: A: Asymmetry B: Border C: Color D: Diameter >6 mm E: Evolution  ABCDE Rule

Developmental Aspects of the Integument: Fetal Lanugo Vernix caseosa

Adolescent to Adult Oil, hair and acne…oh my! Sweat! Cumulative environmental assaults Scaling Dermatitis

Developmental Aspects of the Integument: Old Age Replacement of cells slows and skin gets thinner Decreased lubrication Decreased elasticity Loss of subcutaneous tissue Decreased numbers of Melanocytes Langerhans’ cells