There are three muscles located in the anterior compartment of the upper arm â biceps brachii, coracobrachialis and brachialis. They are all innervated by the musculocutaneous nerve. A good memory aid for this is BBC â biceps, brachialis, coracobrachialis.
Calcitonin is a hormone secreted by the thyroid gland that reduces the concentration of blood calcium level when it has risen to an above normal level. This polypeptide hormone is made up of 32 amino acids and is produced mainly by the parafollicular cells (also known as C cells) of the thyroid gland.
Calcitonin, which is produced by your thyroid gland, serves to lower blood calcium levels. It counters the actions of parathyroid hormone. Calcitonin inhibits osteoclast function, slowing the breakdown of bone.alcitonin's effects on blood calcium levels are small in comparison to parathyroid hormone's influence. High levels of calcitonin, which may be caused by a thyroid tumor, generally do not result in elevated blood calcium.