Embryology

Question 1

What does the embryonic ectoderm give rise too?

Answer 1

Epidermis
CNS
PNS
Eyes
Internal Ears
Neural Crest Cells

Question 2

What do neural crest cells produce?

Answer 2

Many connective tissues of the head

Question 3

What is the embryonic endoderm a source of?

Answer 3

Epithelial linings of the respiratory and alimentary tracts
Glands opening into the GI
Glandular cells of liver & pancreas

Question 4

What does the embryonic mesoderm give rise to?

Answer 4

Skeletal muscle
Blood cells & blood vessel linings
Muscle coats and serosal linings
Ducts & organs of the reproductive and excretory systems
Most of the cardiovascular system

Question 5

What is the embryonic mesoderm the source of within the trunk?

Answer 5

All ct of internal organs

Question 6

What nerve does the 1st pharyngeal arch give rise too?

Answer 6

CN V

Question 7

What muscles does the 1st pharyngeal arch give rise too?

Answer 7

Masticatory Muscles
Mylohyoid
Ant. Belly Digastric
Tensor Tympani
Tensor veli palatini

Question 8

What are the skeletal derivatives of the 1st pharyngeal arch?

Answer 8

Mandible & Maxilla tissue

Meckel’s Cartilage

Question 9

What does Meckel’s cartilage give rise too?

Answer 9

Incus and Malleus
Sphenomalleolar ligament
Sphenomandibular ligament

Question 10

What comes from the groove of the 1st pharyngeal arch?

Answer 10

External auditory meatus

Question 11

What 4 things come from the pouch of the 1st pharyngeal arch?

Answer 11

Tympanic Membrane
Tympanic Cavity
Mastoid Antrum
Eustachian Tube

Question 12

What happens to the 1st pharyngeal arch artery?

Answer 12

It disappears

Question 13

What nerve does the 2nd pharyngeal arch give rise to?

Answer 13

CN VII

Question 14

What muscles are derived from the 2nd pharyngeal arch?

Answer 14

Muscles of facial expression
Stapedius
Stylohyoid
Post. belly digastric

Question 15

What are the skeletal derivatives of the 2nd pharyngeal arch?

Answer 15

Reichert’s Cartilage

Stapes

Question 16

What does Reichert’s Cartilage give rise too?

Answer 16

Styloid process
Stylohyoid ligament
Lesser horns of hyoid bone
Upper part of the body of the hyoid

Question 17

Does the groove of the 2nd pharyngeal arch give rise to anything?

Answer 17

Nope

Question 18

What does the pouch of the 2nd pharyngeal arch contribute too?

Answer 18

The tonsils

Question 19

What nerve does the 3rd pharyngeal arch give rise to?

Answer 19

IX, glossopharyngeal

Question 20

What muscle does the 3rd pharyngeal arch give rise to?

Answer 20

Stylopharyngeus

Question 21

What are the skeletal derivatives of the 3rd pharyngeal arch?

Answer 21

Lower part of the body of the hyoid

Greater horns of the hyoid bone

Question 22

Does the groove of the 2rd pharyngeal arch give rise to anything?

Answer 22

Nope

Question 23

What does the pouch of the 3rd pharyngeal arch give rise too?

Answer 23

Inferior parathyroid gland

Thymus

Question 24

What happens to the artery of the 2nd pharyngeal arch?

Answer 24

Disappears

Question 25

What happens to the artery of the 3rd pharyngeal arch?

Answer 25

Forms part of the carotid artery

Question 26

What nerve does the 4th pharyngeal arch give rise too?

Answer 26

CN X, Vagus

Question 27

What muscles does the 4th pharyngeal arch give rise too?

Answer 27

Cricothyroid

Levator veli palatini

Question 28

What skeletal derivatives come from the 4th pharyngeal arch?

Answer 28

Thyroid cartilage

Cricoid cartilage

Question 29

What does the groove of the 4th pharyngeal arch give rise too?

Answer 29

Nothing

Question 30

What does the pouch of the 4th pharyngeal arch give rise too?

Answer 30

Superior parathyroid gland

Ultimobranchial body

Question 31

What does the artery of the 4th pharyngeal artery give rise too?

Answer 31

Part of the aorta