DLA Grooves And Puches

Question 1

How are the cervical sinus and vesicle formed?

Answer 1

• The 2nd pharyngeal arch overgrows the 3rd and 4th and joins with the 6th enclosing the grooves within to form the cervical sinus and vesicle

Question 2

What is the derivative of the 1st groove?

Answer 2

External acoustic meatus

Question 3

What is the derivative of the 2nd groove?

Answer 3

Obliterated by proliferation of 2nd arch to join the 6th arch

Question 4

What is the derivative of the 3rd groive?

Answer 4

Obliterated by proliferation of 2nd arch to join the 6th arch

Question 5

What is the derivative of the 4th groove?

Answer 5

Obliterated by proliferation of 2nd arch to join the 6th arch

Question 6

What is the derivative of the 1st pouch?

Answer 6

Tubotympanic recess, middle ear cavity, mastoid antrum

Question 7

What is the derivative of the 2nd pouch?

Answer 7

Palantine tonsils, tonsilar fossa

Question 8

What is the 3rd pouch derivative?

Answer 8

Thymus, inferior parathyroid glands

Question 9

What is the derivative of the 4th pouch?

Answer 9

Superior parathyroid glands, ultimopharyngeal body (parafollicular cells of thyroid)