Viscerocranium

Question 1

What are pharyngeal arches

Answer 1

Rods of mesenchyme surrounded by ectoderm and lines by endoderm

Question 2

What arises from pharyngeal arches

Answer 2

Bones, face and soft tissue

Question 3

By what week do pharyngeal arches appear

Answer 3

4-5th week

Question 4

Mesenchyme derives from

Answer 4

Neural crest cells

Question 5

Paraaxial mesoderm gives rise to

Answer 5

Striate muscle

Question 6

Neural crest cells originate from

Answer 6

Dorsal neural folds

Question 7

Neural crest cells from … …. migrate to pharyngeal arches to form bone and cartilage

Answer 7

Midbrain and hindbrain

Question 8

By what week do maxillary and mandibular prominences start forming

Answer 8

By 4th week

Question 9

Which pharyngeal arch gives rise to mandibular and maxillary prominences

Answer 9

1st pharyngeal arch

Question 10

Facial development between what weeks

Answer 10

4th to 8th week

Question 11

Temporal bone, maxilla, palatine and zygomatic bone form from

Answer 11

The ossification of mesenchyme of maxillary prominence (from 1st pharyngeal arch)

Question 12

Primary palate has what origin

Answer 12

Frontonasal prominence

Question 13

Rest of palate origin

Answer 13

Maxillar prominence

Question 14

What forms from the fusion of the 2 palatal plates

Answer 14

Incisive foramen

Question 15

By what week do the two palates fuse together

10th week

Question 16

Mandible origin

Answer 16

Mandibular prominence

Question 17

Cartilage serves as a guide

Answer 17

Cartilage does not ossificate, it is a guide for mesenchyme around it to ossificate

Question 18

1st arch other derivative

Answer 18

Ossicles

Question 19

2nd arch other derivatives

Answer 19

Stypes
Styloid process
Stylohyoid lig.

Question 20

2nd-6th arch other derivatives

Answer 20

Hyoid bone

Laryngeal cartilage