embryology jd 2
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34 terms
Terms | Definitions |
|---|---|
 neural groove | At week 4, a ___ ___ forms over the notochord with a brain bulge at one end. This is the future spinal cord. |
| somites | ___, the divisions of the future vertebra, form. |
| 4 | During week ___, the primitive heart tube is forming. |
| embryonic disk | At week 4, vasculature begins to develop in the ___ ___. |
| anencephaly | Failure of the anterior neural pore to close results in ___. |
| spina bifida | Failure of the posterior neural pore to close results in ___ ___. |
| neural crest | The ___ ___ becomes the peripheral nervous system. |
| neural tube | The ___ ___ becomes the central nervous system. |
| somites | The ___ become the spinal vertebrae. |
| forebrain | The proencephalon is also called the ___. |
| midbrain | The mesencephalon is also called the ___. |
| hindbrain | The rhombencephalon is also called the ___. |
| rapid rate | Alot can go wrong with the development of the neural tube due to the ___ ___ of neurogenesis. |
| neurological, psychiatric | Failure of the neural tube to form the appropriate connections may be the basis of many ____ and ____ disorders. |
| 5 | 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 |
| 5 | 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 |
| mouth | The buccopharyngeal membrane is where the ___ will be. |
| cystic diverticulum | will become the GB |
| pancreas | dorsal pancreatic bud is where the ___ will be. |
| 5 | During week __: cystic diverticulum, which will become the GB, and pancreatic dorsal bud, which will become the pancreas appear |
| 5 | Week ___: the rectal and urinary passageways become separated; anterior and posterior horns differentiate in the spinal cord; the spleen appears |
| 6 | Week __: the embryo measures 8mm in length; eye developing; nasal pits form; the brain divides inot 5 vesicles |
| 6 | 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. |
| 7 | 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 |
| 7 | 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 |
| 8 | 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 |
| 9-10 | 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 |
| 9-10 | Week ___:toxic exposures often cause physiological abnormalities or minor congenital malformation; the embryo is called a fetus at the end of this week. |
| 10-13 | 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 |
| 11-13 | The optimal GA for meausrement of fetal nuchal translucency is __-__ weeks. |
| fluid | 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 ___ ___. |
| 3, aneuploidy | A fetal nuchal translucency meausring at or greater than __mm is considered abnormal and increases the risk of ___ by 4 times. |
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