Final: Chapter Questions Flashcards
Neural crest-derived cells constitute a significant component of which tissue of the eye?
Cornea
The otic placode arises through an inductive message given off by the?
Rhombencephalon
What molecule plays a role in guidance of advancing retinal axons through the optic nerve?
Pax-2
Surface ectoderm is induced to become corneal epithelium by an inductive event originating in the?
Lens vesicle
What extracellular matrix molecule is often associated with migrations of mesenchymal cells, and where does such an event occur in the developing eye?
Hyaluronic acid.
Occurs int he primary corneal stroma
Which of the following is caused by failure of the choroid fissure to close during the 6th week of pregnancy?
Colobomo
A 15-year-old boy with mild acne developed a tender boil along the anterior border of the SCM muscle. What embryological condition would e included in a differential diagnosis?
Branchial cyst
The facial nerve supplies muscles derived from which pharyngeal arch?
Second
Cleft lip results from lack of fusion of the…?
Nasomedial & maxillary processes
In cases of holoprosencephaly, defects of facial structures are typically secondary to defects of the…?
Forebrain
Meckel’s cartilage is a prominent structure in the early formation of the…?
Lower jaw
An early induction in tooth development consists of the ectoderm of the dental epithelium acting on the underlying neural crest mesenchyme. Which of the following molecules is an important mediator of the inductive stimulus?
BMP-4
Why does a person sometimes get a runny nose while crying?
Secretions of lacrimal glands enter nasolacrimal ducts carrying lacrimal fluid into the nasal cavity
Which of the following does not connect directly with the primary nephric (mesonephric) duct?
Metanephros
Which association is correct?
GDNF & metanephrogenic blastema