BRS Summary: Neck

Question 1

What is the Posterior cervical triangle?

Answer 1

Area bounded by the trapezius, sternocleidomastoid, and clavicle and is subdivided by the posterior belly of the omohyoid into the occipital and subclavian
triangles. It contains the spinal accessory nerve; external jugular vein; cervical plexus; roots
and trunks of the brachial plexus; and subclavian, transverse cervical, and suprascapular
arteries

Question 2

What Anterior Cervical Triangle

Answer 2

bounded by the sternocleidomastoid, mandible, and midline of the neck and is subdivided by the digastric anterior and posterior bellies and anterior belly
of the omohyoid into the submandibular, carotid, muscular, and submental triangles

Question 3

Accessory nerve

Answer 3

accessory nerve runs on the levator scapulae, deep to the trapezius, and innervates the trapezius and sternocleidomastoid muscles. The superfi cial (cutaneous) branches of the cervical plexus include the great auricular, transverse cervical, supraclavicular, and lesser occipital nerves. The deep branches of the cervical plexus consist of the ansa cervicalis, which
supplies the infrahyoid or strap muscles, and the phrenic nerve, which runs on the scalenus
anterior and enters the thorax to supply the diaphragm.

Question 4

The **posterior belly of the digastric and stylohyoid muscles **

Answer 4

The posterior belly of the digastric and stylohyoid muscles are innervated by the facial nerve, whereas the anterior belly of the digastric and mylohyoid muscles are innervated by the trigeminal nerve. The geniohyoid and **thyrohyoid **muscles are innervated by C1 through the hypoglossal nerve.