Embryology/Anatomy Multiple Choice Questions

At what gestational period does the otic placode invaginate to form the otic vesicle?

• 2nd week

• 3rd week

• 4th week

• 6th week

• 8th week

Hypoplasia of the thymus likely originates from abnormal development of which pharyngeal pouch?

• First pouch

• Second pouch

• Third pouch

• Fourth pouch

• Fifth pouch

Failure of the medial nasal prominences to fuse with the maxillary prominence leads to:

• Cleft lip

• Choanal atresia

• Thyroglossal duct cyst

• Micrognathia

• Microphthalmia

A midline swelling copula on the floor of the pharynx gives rise to part of the tongue. This swelling originated from:

• First pharyngeal arch only

• Second and third arches only

• Third arch only

• First, second, and third arches

• Fourth arch only

The auricle develops from six hillocks of which pharyngeal arches?

• 1 and 2

• 2 and 3

• 3 and 4

• 4 and 6

• 1 and 3

Which pharyngeal pouch forms the parathyroid glands?

• First

• Second

• Third and fourth

• Fourth only

• Fifth

The otic placode invaginates to form the otic pit during:

• 2nd week

• 3rd week

• 4th week

• 5th week

• 6th week

The membranous labyrinth of the inner ear originates from:

• Mesoderm of the first arch

• Neural crest

• Otic vesicle derived from otic placode

The lens placode is induced by the underlying:

• Surface ectoderm alone

• Optic vesicle

• Neural crest cells

• Frontonasal prominence

• Pharyngeal arch mesenchyme

A cleft located posterior to the incisive foramen is classified as:

• Anterior cleft lip

• Primary cleft palate

• Secondary cleft palate

• Combined primary and secondary cleft palate

• Median facial cleft