Embryology

Question 1

general stages of human development

Answer 1

before fertilization
fertilization and implantation
bilaminar germ disk
gastrulation
neuralation
somitogenesis

Question 2

region where ectoderm and endoderm layers of bilaminer germ disk meet

Answer 2

prochordal plate

Question 3

gastrulation

Answer 3

single layered blastula reorganizes into 3 layered (trilaminar) gastrula

Question 4

organogenesis

Answer 4

during weeks 4-8
the bodys various tissues,organs and limbs start developing

1st trimester

Question 5

during what week do palate and teeth develop

Answer 5

6-8 weeks

Question 6

The 1
st (‘mandibular’) arch forms
structures of

(6)

Answer 6

the face

• Muscles of mastication
• Maxilla, mandible, malleus, and incus

Question 7

The 2
nd (‘hyoid’), 3rd, 4th and 6th
th arches form structures of

Answer 7

the neck

Question 8

the 5th arch is

Answer 8

vestigal

Question 9

2nd pharyngeal arch forms structures of

4

Answer 9

Muscles of facial expression

– Stapes, styloid, and part of hyoid bone

Question 10

3rd pharayngeal arch forms structures such as

2

Answer 10

Body And greater horn of hyoid bone

One pharyngeal muscle – stylopharyngeus muscle

Question 11

4th and 6th pharyngeal arch forms structures such as

Answer 11

Pharyngeal and laryngeal muscles: swallowing & phonation

Laryngeal cartilages

Question 12

Meckel’s cartilage (1st arch)

Answer 12

acts as a scaffold for formation of the mandible, but
then regresses to form the malleus and incus bones of the middle ear and
sphenomandibular ligament

Question 13

Reichert’s cartilage (2nd arch)

Answer 13

forms a portion of the hyoid bone and stapes bone

of the middle ear, as well as the stylomandibular ligament

Question 14

orofacial clefts occur from

Answer 14

failure of fusion between the maxillary/palatal and nasal prominence’s