Module 7

Question 1

Where are the external structures of the face derived from?

Answer 1

Frontonasal prominence, Mandibular prominence, and Maxillary prominence

Question 2

The lower lip is derived from where?

Answer 2

By merging the two streams of ectomesenchyme of the mandibular processes.

Question 3

Formed by the proliferation of mesenchymal neural crest cells ventral to the forebrain.

Answer 3

Frontonasal prominence

Question 4

The localised thickenings that develop within the ectoderm of the frontal prominence, just above the opening of the stomatodeum.

Answer 4

Olfactory placodes

Question 5

The lateral arm of the horseshoe-shaped ridge.

Answer 5

Lateral nasal process

Question 6

The medial arm of the horseshoe-shaped ridge.

Answer 6

Medial nasal process

Question 7

This (process) gives rise to the middle portion if the nose, philtrum region, and intermaxillary segment.

Answer 7

Medial nasal process

Question 8

The maxillary grows medially and approaches the lateral and medial nasal processes but remains separated from them by distinct grooves, which are:

Answer 8

Nasolacrimal groove and the Bucconasal groove

Question 9

The forward extent of the maxillary process and the lateral aspect of the medial nasal process will obliterate the _______ groove, and result in the formation of the _______ lip.

Answer 9

Bucconasal; Upper

Question 10

The forehead, bridge of nose, medial and lateral nasal prominences are derivatives of what process/prominence?

Answer 10

Frontonasal prominence

Question 11

The philtrum, primary palate, upper 4 incisors and associated jaw are derivatives of what process/prominence?

Answer 11

Medial nasal process

Question 12

The sides of the nose or the nasal alae are derivatives of what process/prominence?

Answer 12

Lateral nasal process

Question 13

The cheeks, lateral upper lip, secondary palate, lateral upper jaw are derivatives of what process/prominence?

Answer 13

Maxillary prominence (1st pharyngeal arch)

Question 14

The lower lip and jaw are derivatives of what process/prominence?

Answer 14

Mandibular prominence (1st pharyngeal arch)

Question 15

True or false: The lateral arm of the horseshoe is called the medial nasal process and the medial arm is the lateral nasal process.

Answer 15

False; The lateral arm of the horseshoe is called the LATERAL nasal process and the medial arm is the MEDIAL nasal process.

Question 16

What groove separates the maxillary process from the medial nasal process?

Answer 16

Bucconasal groove