Lesson 2: Chapter 7: Integumentary System: Lab

what two regions is skin composed of

1. Epidermis

2. Dermis

outermost layer of epidermis (20-30 cells thick), accounts for bulk of epidermal thickness

stratum corneum

very thin clear layer that exists in thick skin and is NOT present in thin skin

stratum lucidum

thin layer containing granules that provide waterproofing and support

stratum granulosum

several cell thick, cells in lower layer able to get nutrients and undergo cell division

stratum spinosum

innermost layer (single cell layer thick), cells undergo miotic division

stratum basale

5 major layers of epidermis

1. stratum corneum

2. stratum lucidum

3. stratum granulosum

4. stratum spinosum

5. stratum basale

6. Can Luck Give Super Bass

superficial region of skin

epidermis

connective tissue region

dermis

two layers of dermis

1. papillary layer

2. reticular layer

superficial layer composed of areolar connective tissue. Pain receptors (free nerve endings) and Meissner’s corpuscles (touch receptors found in hairless skin) located here

papillary layer

deepest skin layer composed of dense irregular connective tissue containing many arteries and veins, sweat and sebaceous glands, and Pacinian corpuscles (pressure receptors)

reticular layer