At week 4, a ___ ___ forms over the notochord with a brain bulge at one end. This is the future spinal cord.
___, the divisions of the future vertebra, form.
During week ___, the primitive heart tube is forming.
At week 4, vasculature begins to develop in the ___ ___.
Failure of the anterior neural pore to close results in ___.
Failure of the posterior neural pore to close results in ___ ___.
The ___ ___ becomes the peripheral nervous system.
The ___ ___ becomes the central nervous system.
The ___ become the spinal vertebrae.
The proencephalon is also called the ___.
The mesencephalon is also called the ___.
The rhombencephalon is also called the ___.
Alot can go wrong with the development of the neural tube due to the ___ ___ of neurogenesis.
Failure of the neural tube to form the appropriate connections may be the basis of many ____ and ____ disorders.
Week ___: the embryo measures 4mm in length and begins to curve into a C shape; the heart bulges, further develops, and begins to beat in a regular rhythm
Week __: the brachial arches, grooves which will form structures of the face and neck, form; the neural tube closes
ears, lung, liver, buccopharyngeal
During the Week 5, the ___ begin to form; the 1st traits of the ___ and ___ appear; the ___ membrane ruptures
The buccopharyngeal membrane is where the ___ will be.
will become the GB
dorsal pancreatic bud is where the ___ will be.
During week __: cystic diverticulum, which will become the GB, and pancreatic dorsal bud, which will become the pancreas appear
Week ___: the rectal and urinary passageways become separated; anterior and posterior horns differentiate in the spinal cord; the spleen appears
Week __: the embryo measures 8mm in length; eye developing; nasal pits form; the brain divides inot 5 vesicles
Week ___: leg buds form and hands form as flat paddles on the arms; rudimentary blood moves through primitive vessels connecting the yolk sac and chorionic membranes.
Week __: the embryo measures 13mm in length; lungs begin to form and the brain continues to develop; arms and legs have lengthened with foot and hand areas distinguishable
Week __: the hands and feet have digits, but may still be webbed; the gonadal ridge begins to be perceptable; the lymphatic system begins to develop
Week __: the embryo measures 18mm; nipples and hair follicles begin to form; location of the elbows and toes are visible; spontaneous limb movements may be detected by ultrasound; all essential organs have least begun formation
Week___: intestines rotate; facial features continue to develop; all organs may be present but may not be fully functional; becuase the precursors of the organs are formed, fetus also is not as sensitive to damage from enviornmental exposures as the embryo
Week ___:toxic exposures often cause physiological abnormalities or minor congenital malformation; the embryo is called a fetus at the end of this week.
Weeks __-__: the face is well formed; the limbs are long; the fetus can make a fist with its fingers; the head takes up nearly half the size; eyelids close and will not open until the 28th week; genitals are well-differentiated but are to small to be determined by ultrasound
The optimal GA for meausrement of fetal nuchal translucency is __-__ weeks.
With nuchal translucency, we look for a subcutaneous collection of ___ at the back of the neck.
nuchal translucency, maternal age
The prevalence of chromosomal defects is dependent on both fetal ___ ___ and ___ ___.
A fetal nuchal translucency meausring at or greater than __mm is considered abnormal and increases the risk of ___ by 4 times.