Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
37 Cards in this Set
- Front
- Back
|
Formation of the neural plate
begins on day ______ |
-D18
|
|
|
chemical induction caused by ________
|
notochord
|
|
|
tissue of neural plate is _________
|
neuroectoderm
|
|
|
neural tube formation begins on day ________-
|
19-24
|
|
|
location of closure
|
middle to ends
|
|
|
delayed closure results in
|
spinal bifida, acrania, or anencephaly
|
|
|
neural crest is the first mesenchymal invasion T/F
|
F (second)
|
|
|
origin of the neural chrest
|
arises from the neural folds at the junction between the neural plate and the ectoderm
|
|
|
where do cells of neural crest migrate?
|
within mesenchymal compartment moving anteriorly (ventrally w/ major concerntration of cells posteriolateral to neural tube
|
|
|
what is the fate of the neural crest?
body? head? |
body - peripheral nervous system, suprarenal medulla & melanocytes
head - cartilage, bone peripheral nerves and is associated w/ branchial arts |
|
|
What are the morphological components of the embryonic folds
|
1)head fold
2) tail fold 3) lateral body fold |
|
|
where is growth of embryo most rapid
|
neural growth is most rapid especially head fold region
|
|
|
mesenchyme, esp. somites grow in both head & body contributing to _____________
|
lateral body folds
|
|
|
head tail and lateral folds distinguish embryo from future ___________
|
umbilical chord
|
|
|
_______ contracting help to form the neural tube
|
actin filaments
|
|
|
umbilicus arises from which two things
|
yolk sac and connecting stalk
|
|
|
vitallene duct
|
connection between yolk sac and gut tube
|
|
|
allantois
|
blind ended sac from gut tube
|
|
|
origin of septum transversum
|
septum transversum is originially the most cranial structure just underneath the heart. When head fold starts growing rapidly it pushes heart and septum transversum down. Septum transversum will ultimately become the central tendon of the diaphram
|
|
|
oropharyngeal plate becomes
|
neck
|
|
|
cloacal plate becomes
|
anus
|
|
|
development of umbilical chord
|
the yolk sac and connecting stalks grow much more slowly than the head, tail, & lateral folds they thus turn into the umbilical chord
|
|
|
ectoderm becomes
|
skin(epidermis)
glands(sweat, sebaceous, mammary) hair, nails eye: lens & corneal epithelium inner ear labyrinth anterior pituitary |
|
|
neuroectoderm becomes
|
brain
spinal cord eye: retina, pigment, epithelium, parts of iris, optic nerve pars nervosa of pituitary |
|
|
endoderm becomes
|
alimentary canal (pharynx, esophagus, stomach, intestines)
epithelium and glands only pangreas & liver salivary glands palatine & lingual tonsilar epithelium thyroid and parathyroid glands thymus (epithelial components) lung trachea & larynx (epithelium & glands) middle ear;; epithelium |
|
|
mesoderm in all tissues becomes
|
blood vessels (endothelium & smooth mm)
|
|
|
purse string closing concept results in what feature of the developing embryo
|
caudal and raustral neuropore
|
|
|
when does caudal neuropore close?
rostral neuropore |
Rostral Neuropore: normally closes day 25. Delay results in Exencephaly.
Caudal Neuropore: normally closes day 27. Delay results in spina bifida. |
|
|
what vitamen is important in neural tube closing
|
vitamen B6- folate
|
|
|
mesoderm somite becomes
|
dermis, skeletal mm, vertebrae
|
|
|
mesoderm intermediate becomes
|
adrenal cortex, ureters, kidney & reproductive organs
|
|
|
lateral plate somatopleure mesoderm becomes
|
peripheral skeleton & dermis
|
|
|
lateral plate splanchnopleure becomes
|
smooth mm, vessels & CT around GI tract & bladder
|
|
|
nonspecific primary mesoderm becomes
|
dura and eracnoid matter - red & white blood cells
|
|
|
spetum transversum becomes
|
central tendon of diaphram
|
|
|
neural crest in the body becomes
|
PNS (ganglionic cell bodies, schwann cells, adrenal medulla, melanocytes
|
|
|
neural crest in the head becomes
|
all cell types of neural crest in body* plus some cartilage & bones of skull
*PNS (ganglionic cell bodies, schwann cells, adrenal medulla, melanocytes |
