Parathyroid gland Flashcards
Where is parathyroid gland located? How many?
Label?
2 superior
2 inferior
What supplies the parathyroid gland?
Inferior thyroid artery- from subclavian
What does parathyroid gland drain into?
Thyroid plexus
What innervates parathyroid gland?
Sympathetic
State function of parathyroid gland?
Regulate calcium and phosphate lvls
What does parathyroid hormone secrete in response to low calcium or high phosphate?
PTH
Function of PTH?
1) Increase calcium reabsorption in renal distal tubule
2) Increase intestinal calcium absorption- duo and jej
3) Increase calcium release from bone
4) Decrease phosphate reabsorption
What inhibits PTH?
Serum calcium
When is PTH secreted?
Low lvls of calcium
High lvls phosphate
What occurs if raised serum PTH?
Hyperparathyroidism
Raised serum PTH
State PTH response to hypercalcaemia?
State PTH response to hypocalcaemia?
1) Low calcium
2) PTH secretion increased by parathyroid gland
3) Calcium from bone
Increase intestinal calcium absorp- duo and jej
Decrease urinary calcium
4) Decrease calcitonin
-ve feedback
State PTH response to hypercalcaemia?
1) Too much calcium
2) Parathyroid reduces PTH secretion
3) Reduce calcium absorption intestine and bone
Increase urinary calcium
4) Increase calcitonin
What opposes action PTH?
Calcitonin
