Development of the Head and Neck

Endoderm

Which germ layer does NOT form the head and neck of the developing embryo?

• Ectoderm

• Endoderm

• Mesoderm

• Neural crest

4th week

The pharyngeal arches start forming during which week of development?

Endoderm

Pharyngeal pouches arise from which germ layer?

Ectoderm

The external surface of the pharyngeal arches is composed of which germ layer?

Endoderm

Which germ layer makes up the internal surface of the pharyngeal arches?

Neural crest

Skeletal components develop from which tissue?

Mesoderm

Muscular structures develop from which germ layer?

1

The trigeminal nerve (V) innervates which pharyngeal arch?

Mandibular

Which is the third division (V3) of the trigeminal nerve?

5

Which pharyngeal arch regresses after initial development?

Pharyngeal cleft

Each pharyngeal membrane is located between a pharyngeal pouch and which structure?

Endoderm

The internal lining of the pharyngeal membranes is composed of

Tonsillar fossa

The 2nd pharyngeal pouch forms which structure?

2nd and 3rd

The 2nd pharyngeal cleft is located between which two pharyngeal arches?

Facial bones

Viscerocranium skull development describes the formation of the

Malleus

Which structure is NOT part of the maxillary process?

• Vomer

• Maxilla

• Malleus

• Palatine

Sphenomandibular ligament

Which structure is not ossified?

Maxilla

Which structure does NOT originate from the 2nd pharyngeal arch?

1 month

The earliest the posterior fontanelle might close is at which time?

Frontal bone

Which structure is formed by the membranous neurocranium?

Lateral nasal

Each prominence surrounds the stomodeum to form the face, EXCEPT one. Which is the EXCEPTION?

• Maxillary

• Mandibular

• Frontonasal

• Lateral nasal

Mandibular

The lower lip develops from which prominence?

Cheeks

The maxillary prominence develops into which structure?

Lacrimal sac

Which structure does NOT develop from the intermaxillary segment?

Maxillary

The secondary palate is formed by protrusions from which prominence?

Mandibular prominence

The formation of the definitive palate involves all but which structure?

1

Which pharyngeal arch forms the anterior 2/3 of the tongue?