Exam 18: Development of Orofacial Complex

A unilateral cleft lip is the lack of connective tissue migration between one maxillary process and the fused medial nasal processes.A bilateral cleft lip is the lack of connective tissue migration between both maxillary processes and the fused medial nasal processes.

The buccopharyngeal membrane is significant to head and neck anatomy because when it breaks down at about 10 weeks,the connection between the oral cavity and the digestive tract is established.

Each of the following is true of the buccopharyngeal membrane EXCEPT one.Which one is the EXCEPTION?

The midgut forms all of the following EXCEPT one.Which one is the EXCEPTION?

The thyroid gland originates from

In a pregnant woman,which of the following are known to increase risk for having a baby with a cleft lip or palate (Select all that apply. )?

Formation of a median palatine cyst occurs during migration of the palatal shelves because a few epithelial cells remain embedded in connective tissue and fail to fuse.

The foramen cecum is the point where the thyroid gland begins to develop.It is a small depression near the eustachian tube.

Development of a cleft palate occurs between the 7th and the 11th week.If it occurs early,only the soft palate or uvula will be affected.

Rathke's pouch forms the posterior part of the pituitary gland.

The embryonic heart is seen as a bulge because it develops in an extremely anterior position.

Both muscles of mastication and muscles of facial expression are innervated by the fifth cranial nerve.Muscles of mastication arise from the first pharyngeal arch and muscles of facial expression arise from the fifth cranial arch.

A 3-week-old embryo is approximately 4 mm from the top of the head to the tail area.The buccopharyngeal membrane begins to develop at this time.

The time span from fertilization through two weeks of gestation is referred to as the period of the ovum.The embryonic period of the fetus occurs from the third through the ninth week of gestation.

The hyoid bone arises from the second and third pharyngeal arches.

Which ethnic group is most likely to have a combined cleft lip and palate?

The hyoid arch is pharyngeal arch number

The first and second pharyngeal arches are the largest because they are formed earlier in the developmental process.

If the thyroid gland does not form normally,a red lump known as a lateral lingual swelling develops.This abnormal formation is located on the floor of the mouth.

A globulomaxillary cyst results from improper fusion of the maxillary and mandibular processes.This cyst lies between the maxillary lateral incisor and canine.