Dental Embryology and Histology Chapter 4,5,6

Which best describes apoptosis?

Enzymatic action on epithelial cells causing self-destruction

Which is removed to increase the mineral content of enamel?

Hydroxyapatite

Which type of bone forms between the roots of multirooted teeth?

Interradicular

Which cells form the dental papilla in early tooth development?

Mesenchymal

Which prenatal development occurs first?

Midline constriction is observed in the mandible.

Which genetic abnormality is characterized by more than six congenitally missing teeth?

Oligodontia

Which oblique structure extends from the nostrils to the eyes?

Oronasal optic groove

Tomes processes develop during which stage of amelogenesis?

Secretion

Each cranial nerve innervates the tongue, EXCEPT one. Which is the EXCEPTION?

XI - (eleventh)

During its descent to the front of the trachea, the thyroid gland is attached to the tongue by a thyroglossal

duct

Aside from cleft lip, which facial malformation is most common?

palatal cleft

The ________________ are the last teeth to develop.

third molars

Ameloblasts are fastened to the stratum intermedium by

desmosomes

The base of the tongue forms the ___________ tonsil.

lingual

The philtrum is which embryonic process?

medial nasal

Predentin is composed of ______ noncollagenous protein.

10%

Which percentage of enamel is water?

5%

Which child is LEAST likely to develop a cleft lip?

African-American female

_____________ form enamel.

Ameloblasts

Which two cellular layers fuse to form the reduced enamel epithelium (REE)?

Ameloblasts and stratum intermedium

Which best describes the primary palate?

Anterior wedge-shaped process that acts as a floor to the nasal pits

Which is the initial stage of early tooth development?

Bud

Outer enamel epithelial (OEE) cells of the enamel organ serve which function?

They organize a network of capillaries to support ameloblast cells

The highest fiber turnover in the periodontal ligament occurs in the

apical region

Which structure develops from the maxillary processes?

cheeks

An enclosed swelling found near the hyoid bone is most likely a thyroglossal

cyst

Which characterizes the dental papilla?

densely packed cells

Which tissue surrounds the embryonic pulp in the "cap" stage of tooth development?

dental follicle

The moveable part of the tongue arises from which pharyngeal arch?

first

The heart begins to pump blood in the _________ week of gestation.

fourth

Palatal clefts __________occur in combination with lip clefts.

usually

In which prenatal week does the thyroid gland descend to the front of the trachea?

week 7