posterior triangle of the neck

The triangular space in front of this muscle is called the anterior triangle of the neck; and that behind it, the posterior triangle of the neck.

The inferior belly of the omohyoid divides the posterior triangle of the neck into an upper or occipital triangle and a lower or subclavian triangle.

One of the muscles within the floor of the posterior triangle of the neck, the superior part of levator scapula is covered by sternocleidomastoid and its inferior part by the trapezius.

The levator claviculae muscle in the posterior triangle of the neck is a supernumerary muscle present in only 2-3% of all people but nearly always present in most mammalian species, including gibbons and orangutans.

In the posterior triangle of the neck these rami form three trunks from which fibers enter the axilla region (armpit) to innervate the muscles of the anterior and posterior compartments of the limb.

A cystic hygroma (also known as cystic lymphangioma and macrocystic lymphatic malformation) is a congenital multiloculated lymphatic lesion that can arise anywhere, but is classically found in the left posterior triangle of the neck.

The nerve then descends obliquely behind the Digastricus and Stylohyoideus to the upper part of the Sternocleidomastoideus; it pierces this muscle, and courses obliquely across the posterior triangle of the neck, to end in the deep surface of the Trapezius.

The supraclavicular nerves (descending branches) arise from the third and fourth cervical nerves; they emerge beneath the posterior border of the Sternocleidomastoideus, and descend in the posterior triangle of the neck beneath the platysma and deep cervical fascia.

The supraspinatus muscle is supplied by the suprascapular nerve (C5 and C6), which arises from the superior trunk of the brachial plexus and passes laterally through the posterior triangle of the neck and through the scapular notch on the superior border of the scapula.