DEVELOPMENT OF THE THYROID GLAND

Question 1

develops on

Answer 1

4th week

Question 2

forms on the

Answer 2

the ventral floor of the pharynx at the place known as the foramen cecum

Question 3

foramen cecum lies beteen

Answer 3

tuberculum impar and copula

Question 4

foramen cecum is lined by

Answer 4

endoderm thus thyroid gland will be derived from endoderm

Question 5

thyroid gland forms as ab invagination of

Answer 5

thyroglossal duct

Question 6

thyroglossal duct originates from

Answer 6

foramen cecum and connect the developing tongue to the developing thyroid gland

Question 7

the thyroglossal duct will develop a bifutip that develops into the thyroid gland

Answer 7

which from 2 lobes of the thyroid gland that are joined by isthmus

Question 8

thyroid remains connected to thyroglossal duct and it will pass anterior to the cartilage of 2,3 P arch and by the 7th week it will

Answer 8

attain its adult position anterior to the tracheal rings

Question 9

before its destination thyroglossal duct will degenerate but in some people, it persists to from

Answer 9

the pyramidal lobe of the thyroid gland

Question 10

thyroglossal cysts

Answer 10

occurs when the thyroglossal duct did not degenerate and the cysts will lie anywhere in the migration path but mostly to inferior and superior to the hyoid

Question 11

lingual thyroid

Answer 11

when thyroid gland failed to migrate from the tongue