Question

Which endocrine gland is not an ectodermal origin?

• A. Pineal body
• B. Anterior pituitary
• C. Adrenal medulla
• D. Thymus

Answer 1

The correct option is D Thymus

Endoderm, the innermost of the three germ layers, or masses of cells (lying within ectoderm and mesoderm), which appears early in the development of an animal embryo. The endoderm subsequently gives rise to the epithelium (tissue that covers, or lines, a structure) of the pharynx, including the eustachian tube, the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; the gastrointestinal tract (except mouth and anus), the urinary bladder, the vagina (in females), and the urethra.