Parathyroid

Question 1

Where are the parathyroids?

Answer 1

Anterior neck

Posterior aspect of lateral lobes of thyroid gland

External to thyroid but within its sheath

Question 2

What do the parathyroid glands produce?

Answer 2

Parathyroid hormone

Question 3

What does parathyroid hormone do? Briefly.

Answer 3

Increases Ca concentration in the blood

By increasing absorption in gut
Increasing reabsorption in kidney
Stimulating osteoclast activity

Question 4

How many parathyroids are there? Name them

Answer 4

4

Superior x2
Inferior x2

Question 5

What are the superior parathyroids derived from embryologically?

Answer 5

4th pharyngeal pouch

Question 6

What are the inferior parathyroids derived from embryologically?

Answer 6

3rd pharyngeal pouch

Question 7

Blood supply to parathyroids?

Answer 7

Branches of inferior thyroid arteries

Also helped by s. thyroid, thyroid ima, laryngeal, tracheal, oesophageal

Question 8

Blood drainage in parathyroids?

Answer 8

Into thyroid plexus of veins

Question 9

Innervation of parathyroid?

Answer 9

Thyroid branches of cervical (sympathetic) ganglia

Question 10

What affect to the nerves have on the parathyroid?

Answer 10

Vasomotor only not secretomotor

Question 11

What controls endocrine secretion from parathyroids?

Answer 11

Hormones from pituitary gland.