Derivatives of Mesoderm

Question 1

What happens to mesoderm during days 17-21?

Answer 1

Paraxial, intermediate and lateral mesoderm plates form

Question 2

What does intermediate mesoderm become?

Answer 2

Gonads

Kidneys

Question 3

What does chordamesoderm become?

Answer 3

Notochord

Question 4

What does paraxial mesoderm become?

Answer 4

Somites which then become:
Sclerotome
Myotome
Dermatome

Question 5

What does lateral plate mesoderm become?

Answer 5

Splanchnic

Somatic

Question 6

What happens to paraxial mesoderm in week 3?

Answer 6

Segments fold craniocaudally to form somitomeres

Question 7

What is a somitomere?

Answer 7

Concentric whorls of mesoderm arranged in tight ball, 1 on each side of midline.
Paired formation=somite

Question 8

How many pairs formed by week 5?

Answer 8

42-44

Question 9

What will sclerotome form?

Answer 9

Ribs and vertebrae

Question 10

What will myotome form?

Answer 10

Muscles of the back

Question 11

What will dermatome form?

Answer 11

Dermis and subcutaneous tissue of skin

Question 12

What are the 2 main cavities of the body?

Answer 12

Ventral cavity

Dorsal cavity

Question 13

What are the cavities in the ventral cavity?

Answer 13

Thoracic

Abdominopelvic

Question 14

What are the cavities in the dorsal cavity?

Answer 14

Cranial

Vertebral

Question 15

What will the mesoderm cells of parietal layer do?

Answer 15

Form thin membranes, the serous membranes, which will line the peritoneal, pleural, and pericardial cavities and secrete serous fluid

Question 16

What will mesoderm cells of visceral layer do?

Answer 16

Form thin serous membrane around each organ