Formative assesment 3 module 2 ( development of head and neck ,

A newborn presents with a unilateral cleft lip on the right side. Which embryological process most likely failed?

• Fusion of first pharyngeal arch components

• Merger of lateral nasal prominence with maxillary prominence

• Fusion of medial nasal processes forming the intermaxillary segment

• Persistence of pharyngeal cleft between arches 2 and 3

• Disruption of otic placode invagination

A neonate has abnormal ossicles in the middle ear. Which pharyngeal arch is most likely involved?

• First arch

• Second arch

• Third arch

• Fourth arch

• Sixth arch

Which structure arises from the otic placode?

• Lens of the eye

• Organ of Corti

• Hypophysis

• Palatine tonsils

• Thyroid gland

If the optic cup fails to invaginate correctly, which structure will be malformed?

• Lens vesicle

• Vitreous body

• Retina

• Lacrimal gland

• Palpebral fissure

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

• Second, third and fourth arches

• Neural crest cells alone

• Intermaxillary segment

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