Lab 3: Integumentary System (matt)

Stratum lucidum

Provides resistance to mechanical stress especially at palms and soles

Stratum granulosum

Prevents fluid loss from the body

Stratum corneum

Protection from injuries, heat, water, and chemicals

Stratum spinosum

Provides strength and flexibility

Stratum basale

Produces cells that are pushed upwards and is attached to the dermis

Hypodermis (subcutaneous layer)

Stores fat for energy, large blood vessels and nerve endings

Dermal papillae

Increases surface area, friction, and grip

Meissner (tactile) corpuscle

Detects fine and light touch

Pacinian (lamellar) corpuscle

Detects high frequency vibrations

Arrector muscle of the hair

Thermoregulation by trapping air for insulation

Eccrine glands

Secretes sweat for thermoregulation

Apocrine glands

Secretes thicker sweat associated with body odor

Functions of keratinocytes

Produces keratin and protects internal environment from external