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Sublingual gland
It is not typical for a 13-year-old boy to have a full beard. Most boys at that age are still in the early stages of puberty and may only have some light facial hair starting to develop. If a 13-year-old has a full beard, it could be due to genetics or a hormonal imbalance, and it would be best to consult a healthcare provider for further evaluation.
It is the Pituitary Gland. The Pituitary gland is a major endocrine gland that is connected to the hypothalamus via the infundibulum.
Testosterone which is produced in the testicals plays a major role in puberty and it is the reason why puberty affects your whole body.
Kidney
thymus
Hitting puberty at the age of 17
Endocrine
Hyperthyroidism is when the thyroid gland in the body is overactive. The symptoms this causes can range from palpitations and sweating, tremor in the hands, feeling anxious and tense a lot, losing weight even when eating normally.
According to Wikipedia, the major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands. These glands secrete hormones directly into the blood.
thyroid
A major blood vessel that is formed just posterior to the submaxillary gland as a result of the union of smaller vessels is external maxillary gland is the submental branch of the Facial artery (off of the External Carotid artery)