Glossary of CH.5 Embryology flashcards

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Which of the following structures is the most substantial contributor to the diaphragm?
Septum Transversum
Prior to the head fold, the anterior to posterior order of these structures is
Septum transversum, heart primordium, oropharyngeal membrane, neural plate
After the head fold, the anterior to posterior order of these structures is
Neural plate, oropharyngeal membrane, heart primordium, septum transversum
A neonate has a normal physical examination except for amputation distruptions of finders 2-5 on the right hand. Digits 3-5 have only nubbins remaining, but a fleshy band of tissue is wrapped around the hypoplastic digit 2. The mother was on hormone supp
Explain that this is an amniotic band disruption with minimal recurrence risk and no relation to hormone therapy
The change in orientation of structures by the tail fold is most accurately described as
Allantois-cloacal membrane-neural plate to neural plate-cloacal-membrane-allantois
The lateral fold brings which of the following gorups os structures into the umbilical cord?
Yolk sac, allantios, connecting stalk mesoderm
After the lateral folds are completed, the ventral separation of peritoneal cavity and amnion is composed of what structures?
Somatic layer of lateral plate mesoderm and surface ectoderm, called jointly the somatopleure
A neonate presents with an open cranium, virtually no skull above the eye brows, and disorganized neural tissue within the cranial opening. The embryonic origin of this anomaly is
Failed closure of the cranial neuropore at about 4 weeks post fertilization
The first signs of ear an deye development visible on the embryonic surface are the
Lens placode and otic placodes
This structure contains the major artery to each section of the gut
Dorsal mesentery
This structure disappears excepts near the distal portion of the esophagus
Ventral mesentery
This structure contains planchnic lateral plate mesoderm and gut endoderm
This sturcture divides the peritoneal cavity ventrally in certain portions of the embryo
Ventral mesentery
This structure separates the pleural and peritoneal cavities
Pleuroperitoneal membrane
This structure contributes to the diaphragm
Pleuroperitoneal membrane
The intervillous spaces of the placenta derive from
Lacunae in the synctiotrophoblast
Which sequence best describes the maternal placental circulation?
Sprial arteries, intervillous spaces, endometrial veins
Which sequence best describes the feto-placental circulation?
Stem villi, umbilical vein, fetal heart, umbilical artery
Which group of structures constitutes the placental membrane that is interposed between the fetal and maternal circlations?
Synctiotrophoblast, cytotrophoblast, connective tissue in the chorionic villus, endothelium of the fetal capillaries
A neonate exhibits severe respiratory distress in the delivery room. A chest x-ray shows the outlines of intestines and intestinal gas in the left chest, compressing the heart and lungs. The child cannot be resuscitated, and expries with severe acidosis
Congential disphragmatic hernia with inadequate lung volume due to fetal underdevelopment of the lungs
Persists as a Meckel diverticulum in 2% of individuals
Yolk sac
Involutes to become the median umbilical ligament
May accumulate extra fliud with anomalies such as duodenal atresia
Premature separation from decidua may cause fetal death
May persist as the urachus
One-fourth of their DNA is identical
Identical DNA with shared body parts
Conjoined twins
Identical DNA, very different sizes
Parasitic twins
One-half of their DNA is identical
Dizygotic twins
Always two amnions and two chorions
Dizygotic twins
pictures on pg15 of E5
First branchial arch
pics on pg15
Lens placode
pics on pg15
If you were asked to counsel a couple regarding the fetus shown in Fig. 5-1, the most likely diagnosis and recurrence risk would be
Amniotic band disruption with multiple anomalies, <1% risk for amniotic band disruption in future pregnancies

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