Muscular or Visceral Triangle

The muscular triangle has the following boundaries: mid line of neck (1) superior belly of omohyoid (2) sternomastoid (3) The muscles forming and within the triangle are seen in image labeled Muscles (these muscles are often called the strap muscles, for obvious reasons: superficial layer sternohyoid (sh) superior belly of omohyoid (oh) deep layer thyroid (th) sternothyroid (st)	Boundaries	Muscles
When the strap muscles are reflected, you are able to see the thyroid gland (tg) with its arteries (superior thyroid artery from the external carotid (sta) and the inferior thyroid artery from the thyrohyoid trunk from the subclavian (ita). If the thyroid gland is reflected laterally, the structures making up the larynx and trachea are seen: thyrohyoid membrane (thm) thyroid cartilage (Adam's apple)(tc) cricothyroid membrane and ligament (ctm) cricoid cartilage (cc) tracheal rings (tr)	Thyroid gland and it arterial supply