Embryology of the Integument Flashcards Preview

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Flashcards in Embryology of the Integument Deck (36):
1

up to how many weeks of development is the embryonic skin consist of only a single layer of surface ectoderm

5 weeks

2

stage one of epidermis/dermis development

surface ectoderm and mesoderm

3

stage two of epidermis/dermis development

surface ectoderm proliferates and forms a layer of superficial cells

4

periderm

superficial cells that become keratinized cells

5

vernix caseosa

functions as a protection and lubricant

6

the original layer of ectoderm remains as

a proliferative layer

7

stage three of epidermis/dermis development

there are now identifiable layers of the skin

8

what happens by 8 weeks by involvement of neural crest cells

migrate into the skin and give rise to melanocytes-these produce and secrete pigment melanin

9

dermis is derive from

mesoderm underlying ectoderm mostly from lateral plate mesoderm

10

most sebaceous glands develop as invaginations of the

epidermis related to the root of hair follicles

11

what contribute to the vernix caseosa

sebaceous glands

12

how to sweat glands develop

invaginations of the epidermis and grow into the dermis

13

peripheral cells of the sweat glands develop into

secretory and myoepithelial cells

14

mammary glands are modified

sweat glands

15

mammary glands form along

thickened ectodermal ridges that extends from the axilla to the pubic region

16

connective tissue and adipose associated with mammary glands derives from

mesoderm

17

what is the function of the first hairs

they hold the vernix against the skin

18

the arrector pili muscles form from

mesoderm

19

nails begin to develop at the very tip of the digits as

epidermal thickenings called the nail fields

20

teeth are derived from what sources

oral ectoderm, mesoderm and neural crest cells

21

mandiublar teeth develop before or after maxillary teeth

mandibular teeth

22

what sex's teeth develop first

female

23

What are the three stages of tooth development

bud stage, cap stage, and bell stage

24

what part of the teeth are formed from oral ectoderm

enamel

25

the dental sac forms

periodontal ligament and cementum

26

ichthyosis

excessive keratinization of the skin

27

angiomas

from the persistence or surplus of blood or lymphatic vessels

28

nevus flammeus

flat pink or red blotck that appears on the posterior aspect of the neck

29

hemangioma

port wine stain found on the face

30

albinism

melanocytes fail to produce melanin and the skin, hair, and retina lack pigament

31

supernumery nipples

extranipples or even breast form anywhere along the milk lines and are fairly common

32

congenital alopecia

absence of loss of hair

33

hypotrichosis

excessive hairiness

34

amelogenesis inperfecta

enamel is improperly formed and is soft and friable and the teeth are yellow or brown because of exposed dentin

35

dentinogenesis imperfecta

common condition where the odontoblasts fail to differentiate and dentin is NOT calcified

36

discolored teeth

tetracycline can cause teeth to yellow brown