Open Ended Q's Flashcards
Trunk neural crest cells utilize three migratory pathways. The earliest (first) emigrating cells follow which of the following pathways?
Ventral path
Cranial neural crest cells from the region of rhombomeres 6 and 7 are involved in the establishment of which of the following structures?
Pharyngeal arch 3
Neural crest cells that give rise to the leaflets of the semilunar valves, thymus, thyroid and parathyroid glands, and the septa that divide the conus arteriosus into the aortic and pulmonary arteries arise from which of the following?
Cardiac neural crest
Which of the following neurocristopathies is characterized by pigmentation defects, white stripe of the hair, deafness, and cleft palate among others?
Waardenburg syndrome
A low concentration of which of the following factors results in placode formation, while a high concentration of the same factor result in the formation of neural plate
BMP
If it said ventral you would put Sonic Hedgehog
Which of the following factors is referred to as the “master gene of eye development” in Drosophila and in human eye development is necessary to induce the formation of the lens placode?
Pax 6
In the development of the retina, the nasotemporal axis (anterior-posterior) is fixed first (before the dorsoventral axis). The axis is established, in part, by gradient composed of which of the following?
Ephrins
Except for pharyngeal arch musculature, the rest of pharyngeal arch mesenchyme is derived from which of the following source?
Neural crest
Except for the first pharyngeal pouch, patterning of pharyngeal arch endoderm is heavily based on exposure to which of the following factors?
Retinoic acid
Shaping of the snout involves the establishment of a gradient between which of the following pairs of signals?
FGF-8 and Shh
Which of the following develops from the cartilaginous portion of the second pharyngeal arch?
Stapes
The palate forms during which of the following time periods?
6-10 weeks of development
