Tags: Anatomical Structure, Nerve.
The ansa cervicalis (or ansa hypoglossi in older literature) is a loop of nerves that are part of the cervical plexus. It lies superficial to the internal jugular vein in the carotid triangle.Branches from the ansa cervicalis innervate most of the infrahyoid muscle including the sternothyroid muscle sternohyoid muscle and the omohyoid muscle. Note that the thyrohyoid muscle which is also an infrahyoid muscle is innervated by cervical spinal nerve 1 via the hypoglossal nerve.
