THYROID GLAND PARATHYROID GLAND

Question 1

The thyroid gland develops from the

Answer 1

endodermal lining of the floor of the primitive
pharynx

Question 2

The primordium grows caudally and forms a
duct like invagination known as

Answer 2

Throglossal duct.

Question 3

Follicular epithelium contains
two types of cells

Answer 3

-Follicular and
-Parafollicular cells

Question 4

The follicles contain a gel-like
mass called

Answer 4

colloid

Question 5

Follicular cells (principal cells)

Answer 5

T3 T4 production
Basophilic o
1 or 2 prominent nucleoli

Abundant lysosomes and endocytic
vesicles, identified as colloidal
resorption droplets

Question 6

Parafollicular cells (C cells - clear cells)

Answer 6

They secrete calcitonin

Question 7

• An extensive network of fenestrated capillaries derived from the ………………………. surrounds the follicles

Answer 7

Superior and inferior thyroid arteries

Question 8

SYNTHESIS OF THYROID
HORMONE

Answer 8

1-Synthesis of thyroglobulin
2- Resorption, diffusion and
oxidation of iodide
3-Iodination of thyroglobulin
4-Formation of T3 and T4 by
oxidative coupling reactions
5-Resorption of colloid
6-Release of T4 and T3 into the
circulation and recycling

Question 9

E a c h p a r a t h y r o i d g l a n d i s
surrounded by a thin connective
tissue ……..that separates it from
the thyroid.

Answer 9

Capsule

Question 10

Parathyroid gland receives blood from …..

Answer 10

Inferior thyroid arteries

Question 11

Cells of parathyroid gland

Answer 11

Principal cells( Chief cells ) ——PTH
Oxyphil cells