Monday, 29 April 2013

PARATHYROID GLANDS

Normally there are 4 parathyroid glands in human.
Measurement:6x4x2 mm
Weight:30-50 mg

Removal of parathyroid glands:
1-2;cause little physiologic abnormality
3;cause transient hypothyroidism (because small quantity of remaining parathyroid tissue is usually capable of hypertrophy to perform function of all glands)

Histologically contain:-
Chief cells(mainly)-secrete parathyroid hormone(PTH)
Oxyphilcell cells(absent in many animals and young humans-unknown functions.