Question

Which gland does not originate from embryonic endoderm?

• A. Thymus
• B. Parathyroid
• C. Adrenal cortex
• D. Thyroid

Answer 1

Answer: (C)

Adrenal cortex

The endoderm gives rise to the epithelium 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. The adrenal glands develop from two separate embryological tissues; the neural crest ectoderm and the intermediate mesoderm.