C cells are present in
Cells of the ultimobranchial body give rise to the parafollicular or C cells of the thyroid gland. These cells secrete calcitonin, a hormone involved in regulation of the calcium level in the blood.Reference: Krishna Garg Histology; 5th edition; Page no: 230; 232
Thyroid gland
Parathyroid gland
Pituitary gland
Thymus
Head and neck