Thyroid Gland

THYROID GLAND

Q. 1 The thyroid gland receives its blood supply in part from branches of which of the following?
 A Internal carotid artery
 B Lingual artery
 C Subclavian artery
 D Transverse cervical artery
Q. 1 The thyroid gland receives its blood supply in part from branches of which of the following?
 A Internal carotid artery
 B Lingual artery
 C Subclavian artery
 D Transverse cervical artery
Ans. C

Explanation:

The inferior thyroid artery arises from the thyrocervical trunk, a branch of the subclavian artery. The superior thyroid artery arises from the external  carotid  artery  An  inconsistent  thyroid ima  artery  when  present,  may  arise  from  the aortic arch, the innominate artery or the common carotid  artery  There  are  no  branches  of  the internal carotid artery and infrequent branches of the common carotid artery in the neck. The transverse cervical artery supplies the posterior triangle of the neck. The vertebral arteries give off spinal and muscular branches in the neck.


Q. 2

Which of the following feature about thyroid gland is TRUE?

 A

Normal thyroid is 12-20g in size

 B

Poorly vascular

 C

Firm in consistency

 D

Four parathyroid glands located laterally and posteriorly to thyroid gland

Q. 2

Which of the following feature about thyroid gland is TRUE?

 A

Normal thyroid is 12-20g in size

 B

Poorly vascular

 C

Firm in consistency

 D

Four parathyroid glands located laterally and posteriorly to thyroid gland

Ans. A

Explanation:

The thyroid is located anterior to the trachea between the cricoid cartilage and the suprasternal notch. It weighs 12–20 g, highly vascular, and soft in consistency.
Four parathyroid glands are located posterior to each pole of the thyroid.
The recurrent laryngeal nerves traverse the lateral borders of the thyroid gland and must be identified during thyroid surgery to avoid injury and vocal cord paralysis.

Ref: Harrison, E-18, P-2911


Q. 3

Isthmus of thyroid gland corresponds to which of the following tracheal rings?

 A

1-3

 B

2-4

 C

4-6

 D

6-8

Q. 3

Isthmus of thyroid gland corresponds to which of the following tracheal rings?

 A

1-3

 B

2-4

 C

4-6

 D

6-8

Ans. B

Explanation:

Isthmus of the thyroid gland lies in front of the second, third and fourth tracheal rings.

It is covered in front by skin and fascia, and by sternothyroid and sternohyoid muscles and by the anterior juglar veins.

Upper end of each lobe of thyroid lies opposite C5 vertebrae.
The lower end of the lobe lies at the level of 5th or 6th tracheal ring corresponding to T1 vertebrae. 


Q. 4

Average weight of thyroid gland where diet is rich in Iodine is –

 A

10-12gm

 B

14-16 gm

 C

18-20 gm

 D

28-30 gm

Q. 4

Average weight of thyroid gland where diet is rich in Iodine is –

 A

10-12gm

 B

14-16 gm

 C

18-20 gm

 D

28-30 gm

Ans. C

Explanation:

Ans. is ‘c’ i.e., 18-20 gm

o The weight of the normal adult thyroid is approximately 15 to 25 gm.

Follicular cells produce      —>          T4& T3.

Parafollicular ‘c’ cells produce —>    Calcitonin.


Q. 5

Enlargement of thyroid gland with tenderness is most commonly seen in:           

March 2013

 A

DeQuervains thyroiditis

 B

Hashimoto’s thyroiditis

 C

Grave’s disease

 D

Reidel’s thyroiditis

Q. 5

Enlargement of thyroid gland with tenderness is most commonly seen in:           

March 2013

 A

DeQuervains thyroiditis

 B

Hashimoto’s thyroiditis

 C

Grave’s disease

 D

Reidel’s thyroiditis

Ans. B

Explanation:

Ans. B i.e. Hashimoto’s thyroiditis


Q. 6

Lymphatic drainage of thyroid gland is mainly ‑

 A

Sublingual nodes

 B

Submandibular nodes

 C

Deep cervical nodes

 D

Submental nodes

Q. 6

Lymphatic drainage of thyroid gland is mainly ‑

 A

Sublingual nodes

 B

Submandibular nodes

 C

Deep cervical nodes

 D

Submental nodes

Ans. C

Explanation:

Lymphatic drainage of thyroid

  • Lymph from the upper part of the gland reaches the upper deep cervical lymph nodes either directly or through the prelaryngeal nodes.
  • Lymph from the lower part of the gland drains to the lower deep cervical nodes directly, and also through the pretracheal and paratracheal nodes.

Q. 7

Inferior thyroid artery is a branch of?

 A

Thyrocervical trunk

 B

External carotid artery

 C

Internal carotid artery

 D

None of the above

Q. 7

Inferior thyroid artery is a branch of?

 A

Thyrocervical trunk

 B

External carotid artery

 C

Internal carotid artery

 D

None of the above

Ans. A

Explanation:

Thyrocervical trunk gives three  branches (SIT):

S-Suprascapular artery

I- Inferior thyroid artery

T-Transverse cervical artery


Q. 8

Inferior thyroid vein drains into?

 A

Internal jugular vein

 B

Superior ven cava

 C

Brachiocephalic vein

 D

External jugular vein

Q. 8

Inferior thyroid vein drains into?

 A

Internal jugular vein

 B

Superior ven cava

 C

Brachiocephalic vein

 D

External jugular vein

Ans. C

Explanation:

Superior & middle thyroid veins drain into the internal jugular vein and the inferior thyroid vein drain into the brachiocephalic vein


Q. 9

Inferior thyroid artery is related to?

 A

Superior laryngeal nerve

 B

Recurrent laryngeal nerve

 C

Glossopharyngeal nerve

 D

XII nerve

Q. 9

Inferior thyroid artery is related to?

 A

Superior laryngeal nerve

 B

Recurrent laryngeal nerve

 C

Glossopharyngeal nerve

 D

XII nerve

Ans. B

Explanation:

The Recurrent laryngeal nerve lies very close to the inferior thyroid artery near the base of the thyroid lobe.


Q. 10

NOT true is:

 A

Superior thyroid artery is branch of external carotid

 B

Parathyroid artery is a branch post division of superior thyroid artery

 C

Inferior thyroid artery is branch of thyrocervical trunk

 D

Thyroid ima artery is invariaby a  branch of arch of aorta

Q. 10

NOT true is:

 A

Superior thyroid artery is branch of external carotid

 B

Parathyroid artery is a branch post division of superior thyroid artery

 C

Inferior thyroid artery is branch of thyrocervical trunk

 D

Thyroid ima artery is invariaby a  branch of arch of aorta

Ans. B

Explanation:

Parathyroid arteries are usually branches of inferior thyroid (& not superior thyroid) artery

Superior thyoid artery is a branch evternal carotid artery & contributes partly towards the parathyroids blood supply

Inferior thyroid artery is a branch of thyrocervical trunk & is the main source of blood supply to the parathyroids.

Thyroid ima artery is present in a small group of population & has a variable origin (may be a branch of arch of aorta, subclavian artery, common carotid artery).


Q. 11

Ligament of Berry in thyroid fixes :

 A

Hyoid bone

 B

Cricoid cartilage

 C

Trachea

 D

Thyroid

Q. 11

Ligament of Berry in thyroid fixes :

 A

Hyoid bone

 B

Cricoid cartilage

 C

Trachea

 D

Thyroid

Ans. B

Explanation:

The ligament of berry is the superior suspensory ligament of the thyroid gland located adjacent to the cricoid cartilage on the posterior surface of the thyroid gland.



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