The<unk> s are small endocrine<unk> s in the neck, usually located behind the thyroid<unk> , which produce<unk>  hormone.  In rare cases the<unk> s are located within the thyroid<unk> s. Most often there are four<unk> s, but some people have six or even eight.
Parathyroid gland
Thyroid gland
Adrenal cortex
Thyroid isthmus
Mammary gland
Lingual thyroid
Breast
Renal corpuscle