Module 7 Integumentary System

Layers of Epidermis deep - superficial

Stratum Basale, spinosum, granulosum, lucidum and corneum

Thick skin contains

Stratum lucidum and fiction lines

Thick skin lacks

Hair, sebaceous and apocrine glands

Thin Skin has

thicker dermis, more flexible

Keratinocytes

In epidermis, produced in basale layer, waterproof skin

Merkel Cells

Touch receptors

Melanocyte

Produce melanin from UV light

Langerhan Cells

Immune cells in epidermis

Stratum Corneum

Stratum Granulosum

Stratum Spinosum

Stratum Basale

Papillary Dermis

Reticular Dermis

Meissner corpuscles

Pacinian corpuscles

Sebaceous gland

Merkel cells

Stratum Corneum

superficial layers of dead cells

Stratum Lucidum

Thick skin, 3-5 layers of clear dead keratinocytes

Stratum Granulosum

2-5 layers of dead keratinocytes

Stratum Spinosum

Mitotic division occurs in the 8-10 layers

Stratum Basale

Cells divide and move up

What does hypodermis do?

Attach dermis to bone and muscles

Hypodermis tissue

Loose connective, elastic, collagen

Papillary Dermis

Loose connective with fibers

Reticular Dermis

Dense irregular connective

Sebaceous gland

Holocrine, produce sebum

Eccrine

Sweat gland using ducts

Apocrine

Sweat glands that open to hair, start use in puberty

Ceruminous

Modified eccrine gland, secrete earwax

Free nerve cells

Touch receptors, little force needed, close to surface

Pacinan

pressure receptor in reticular dermis

Epidermis tissue consists of….

Stratified squamous epithelial cells

Subcutaneous layer tissue type

Loose connective

Carotene color + cause

Yellow orange due to increased intake of carotene

Jaundice color + cause

Yellow, increased amount of bile

Erythema color + cause

Red due to increased blood flow

Cynaosis color + cause

Blue due to decreased oxygen

Merkel Cells

In nerve endings in epidermis for light touch

Ruffini end organ detects

Stretch, pressure, continuous touch

Hair cortex

Bulk of hair

Cuticle

Hair surface