11. Gastrulation and Neurulation Flashcards
Gastrulation is the formation of the 3 germ layers _
ectoderm, mesoderm and endoderm
Neurulation is the formation of the _ and _
notochord and primitive nervous system
The germ disc has a _ and _ end
cranial and caudal
The 2 structures near the caudal end of the germ disc are _
primitive node
primitive streak
At 13 days, formation of the _ begins and germ layers begin to form
chorionic cavity
T/F During the chorionic cavity formation, the epiblast and hypoblast form
True
The ectoderm forms from the _ and the endoderm from the _
epiblast
hypoblast
The prochordal plate is known as the _
signaling center of embryonic disc
At 18 days, the _ and notochordal process are present between the oropharyngeal membrane and primitive streak
neural plate
The _ forms on the surface of the epiblast
primitive streak
During gastrulation, _ cells move either to an area between the epi and hypoblast or move directly to hypoblast
epiblast
The period of _ is from _ to 8 weeks
organogenesis
3
List 2 derivatives of the ectodermal germ layer
neural plate development
skin
List 2 derivatives of the mesodermal germ layer
connective tissues
muscles
List 2 derivatives of the endodermal germ layer
forgut
hindgut linings
Notochord formation results from _ cells invaginating in the primitive pit moving in the cephalic direction to the prechordal plate
prenotochordal cells
The notochord stops at the _ membrane
cloacal
The neural tube forms from the _ elevating into _ that fuse
neural plate
neural folds
The cephalic neural tube expands into the _
brain vesicles
The cells overlying the notochord thicken and form the _
neural plate and neural crest
Ectoderm derivatives include the sensory components of the _, _, and _
ear
nose
eye
T/F epidermis, hair and nails form from the ectoderm
true
Enamel forms from the _
ectoderm
_ forms somites
_ forms urinary system
_ forms the somatic and splanchnic mesoderm
Paraxial
intermediate
lateral plate
Mesodermal derivatives include _
parts of the skull
After the neural tube closes, the somite divides into 3 things:
Sclerotome
myotome
dermatome
Sclerotome surround the neural tube and notochord to form the _
vertebral column
_ cells provide the segmental musculature of the axial skeleton
myotome
The _ forms the dermis layer of the skin
dermatome
The endoderm derivatives form the epithelial portion of 5 things:
pharynx thyroid tonsils lining of GI tract lining of respiratory tract
