Unit II: Integumentary System Flashcards
Where is the epidermis derived from?
Ectoderm
Where is the dermis derived from?
Mesenchyme
Embryonic CT is made from:
- mesoderm
2. neural crest cells
The periderm is the ___ layer
Keratinized
The basal layer produces ___
New cells
What is vernix caseosa?
White substance that covers the fetus
Functions of the vernix caseosa
- protects the skin from amniotic fluid
2. lubricates fetus
Sweat glands develop as ___
Down growths
Are sweat glands associated with hair follicles?
No
What is the term for fingerprints?
Epidermal ridges
What is albanism?
- autosomal recessive genetic trait
- lack pigmentation
- normal number to melanocytes
- can’t produce tyrosinase
Hair develops as ___
Down growths
A small bud grows from the wall of the developing hair follicle to form a ___
Sebaceous gland
What are the first hairs to form?
Lanugo
Nail fields are surrounded by ___
Nail folds
Fingernails reach the tips by week __
32
Toenails reach the tips by week __
36
T/F: development of the lactiferous ducts and nipples in males and females is different at birth
False- identical
What is polythelia?
- extra nipple
2. more common in females
What is polymastia?
- extra breast
- inferior to normal breast
- along mammary crest
What is an inverted nipple?
- nipple fails to evert
- problems with latching
- failing to evert in adulthood may indicate breast cancer
