Catalyst Questions

1. What is the dermis directly below? 2. what is the dermis mainly made of? 3. What are the two structures that separate

the dermis from the epidermis? 4. What does the hypodermis generally have a

lot of? 5. What is the function of the hypodermis?

Let’s Review… 1. Directly below the epidermis 2. it is mainly composed of collagen but also contains reticular

fibers, fibroblasts, and other fibrous connective tissue cells 3. The papillary and reticular layers

Papillary is a thin zone of areolar tissue (allows for mobility of leukocytes)

Reticular layer of the dermis is deeper and much thicker It consists of dense, irregular connective tissue.

4. The hypodermis is mainly composed of adipose tissue which serves as energy reservoir and thermal insulation.

Class Updates…

Review day on Wednesday August 24th, plus in class project!

TEST NEEDS TO BE TAKEN BY TUESDAY OR YOU WILL RECEIVE A ZERO

Short test on the integumentary system will be on Friday, 26th !

Review Sheets

A completed review sheet will be worth +10 on the exam.

There was a strong correlation for those that completed the review sheet and their score on their exam.

Making Skin Diagrams!

Done with partners Use the puzzle pieces provided Use color, label each and describe

the functions! You have 25 minutes, I will set a

timer and it will be collected for a grade.

Skin Conditions/Diseases

SWBAT Identify 7 different uncommon skin

diseases and relate it to their knowledge of the integumentary system.

1. Argyria: Blue Skin

Caused by the ingestion of silver

It affects the dark pigments of skin and the sun decomposes the silver into silver sulfides

It also affects the organs

It is permanent but laser treatment has been used to some success

Most popular case includes an individual named Paul Karason who drank 10 ounces of silver a day to cure his arthritis.

Epidermodysplasia Verruciformis

Abnormal susceptibility to human papillomavirus (HPV)

Is asymptomatic in most individuals

Results in a growth of scaly macules (warts) and plaques, particulary on the hands and feet.

No serious treatment though can be surgically removed to some success

Hypertrichosis: Human Werewolf Syndrome

Causes excissive hair growth in places that hair does not usually grow

Can present all over the body or only in specific locations

Some are born with the condition while others develop it later in life

No cure, even with laser treatment

Blaschko’s Lines Strange stripes all over the body Extremely rare Neither specific disease nor predictable syndrome of

a disease Blaschko’s lines are invisible pattern built into human

DNA May be linked to inheritance or acquired disease of

the skin or a mucosa manifest themselves in to patterns creating visual appearance of stripes

The pattern varies from patient

Vitiligo: white patched skin

The skin pigments (melanocytes) get destroyed Causes white patches to appear on the skin Patches also show up in the mucous membranes and

retina of the eyes The exact cause is still unknown Maybe caused by a combination of auto-immune,

genetic and environmental factors. Treatment includes steroids, UV light, and creams

Tungiasis

Fleas burrow into the skin and lay eggs which causes skin inflammation, severe pain, itching, and lesions at the site of the infection.

Skin infestation of the Tunga penetrans flea Found in tropical parts of Africa, Caribbean, Central and

South America. The disease is an epidemic in Nigeria, Trinidad, and

Tobago Secondary infection can cause death Surgical extraction followed by treatment with

antibiotic

Dermatographia: overly sensitive skin

AKA skin writing

Overly sensitive to minor injuries; even light scratches

The immune system exhibits hypersensitivity; that releases excessive amounts of histamine

Which causes capillaries to dilate and welts to appear

The marks usually disappear

EXIT TICKET:

Chose one the skin diseases discussed today and write at least FOUR complete sentences describing it.