Flashcards in Lecture 2 Deck (16):
what develops from the maxillary processes?
-lateral and upper portion of the lips and cheeks
-secondary palate; gingiva; tooth primordium
what are the adult structures form the mandibular processes?
- the mandible
- the lower lip
- the lower cheeks
- the chin
- the gingiva associated with lower jaw
what does the primary palatal shelf evolve from?
medial nasal prominence/process
what does the secondary palate arise from?
internal growth plates of the maxillary process
describe palatal development
1. elevation at the end of the 7th week;
- the muscles in the tongue contracting
- the development of specific receptors (CAM’s) on the cell surface
- the invasion of neural crest cells into the palatal shelves
3. breakdown--apoptosis of epithelial cells
4. merging--neural crest and mesoderm intermingle
what is a cyst?
a pathological cavity lined with epithelia;Epithelium entombed in mesenchymal tissue secretes fluid
Osmotic pressure gradient is set up so that fluid buildup creates cystic cavity
The mandible is formed by both intramembranous & endochondral bone formation (body vs. ramus & condyles)
what forms the oropharyngeal membrane?
the fusion of the stomodeum ectoderm and the endoderm of the alimentary canal
study slide 12
define prominences, swellings, primordia
are some sort of recognizable, prominent tissue growth or swelling that is recognized as the primary (initial) formation of that structure. Often refers to all tissue types (ecto, meso, and endodermal ) associated with the structure.
what is a placode?
a thickening of epithelial ectodermal tissue that develops into part of a particular tissue; only epithelial whereas prominences are endo, ecto, meso
compare and contrast arch vs process
Arch vs. Process: For the face, arches refer to the five Branchial Arches, whereas a process refers either to a growth center (frontonasal process) or a SUBSTRUCTURE of the mandibular ARCH (i.e., maxillary process & mandibular process)
what are the 5 growth centres of the face?
frontonasal process; 2 max. process and 2 mand. process
study slide 22
what does a cyst along teh nasolacrimal groove mean?
means the lateral nasal swellings did not fuse with the maxillary process