What nerve Innervates posterior belly of Digastric?


The anterior belly of the digastric muscle is innervated by the mylohyoid branch of the trigeminal nerve, aka cranial nerve V. The posterior belly of the digastric muscle is innervated by the facial nerve, aka cranial nerve VII.

Likewise, where is the Digastric muscle located? The digastric muscle is located in the neck, beneath the jaw. This muscle belongs to the suprahyoid muscle group, and it assists in opening and closing the jaw. Curved in shape, this muscle extends from the mastoid process at one end to the symphysis menti at the other.

In respect to this, what is the Stylohyoid innervated by?

The stylohyoid muscle is a slender muscle, lying anterior and superior of the posterior belly of the digastric muscle. It shares this muscle’s innervation by the facial nerve, and functions to draw the hyoid bone backwards and elevate the tongue.

What causes Digastric muscle pain?

The upper portions of the sternocleidomastoid muscle will be tender to the touch a result of trigger points from the posterior belly of the digastric muscle. The digastric can also cause a deep ear pain described as being in front of or below the ear that is not caused by an ear infection.

What are the muscles under your chin?

Digastric Muscle. The digastric muscle is a paired muscle that inserts on the mastoid process, part of the temporal bone behind the ear, and the suture that joins the two halves of the lower jaw.

What attaches to the mastoid process?

The mastoid process serves for the attachment of the sternocleidomastoid, the posterior belly of the digastric muscle, splenius capitis, and longissimus capitis.

What does the masseter muscle do?

Masseter Muscle: Function The main function of the masseter muscle is to help a person bite down or chew. Specifically, this muscle helps to pull the lower jaw upward, which causes the jaws to close while chewing. The word ‘mastication’ (to chew) comes from the word masseter.

What is in the submandibular triangle?

The submandibular triangle is located underneath the body of the mandible. It contains the submandibular gland (salivary), and lymph nodes. The facial artery and vein also pass through this area.

What does the Hyoglossus muscle do?

Function. The hyoglossus depresses and retracts the tongue and makes the dorsum more convex.

Which muscle of face is not supplied by facial nerve?

The stylohyoid muscle, stapedius and posterior belly of the digastric muscle are also supplied by the facial nerve, but are not considered muscles of facial expression.

What is the action of the Digastric?

Function. The digastric muscle is involved in any complex jaw action such as speaking, swallowing, chewing and breathing. When the digastric muscle contracts, it acts to elevate the hyoid bone. If the hyoid is being held in place (by the infrahyoid muscles), it will tend to depress the mandible (open the mouth).

Where is the intermediate tendon?

It is located in the front of the neck and consists of two bellies separated by an intermediate tendon. Its superior belly serves as the most lateral member of the infrahyoid muscles, located lateral to both the sternothyroid and thyrohyoid muscles.

Why is it called Eagle syndrome?

Eagle syndrome is a condition that causes pain in the throat and face. It is typically caused by an unusually long styloid process bone, which is a pointy bone just beneath the ear.

Which muscles elevate the hyoid bone?

The mylohyoid elevates the hyoid bone, tenses the floor of the mouth. The Geniohyoid pulls the hyoid bone anterosuperiorly, shortening the floor of the mouth and widening the pharynx during swallowing. The Stylohyoid elevates and retracts the hyoid bone, elongating the floor of the mouth during swallowing.

Can you palpate the styloid process?

The styloid process is a cylindrical, long cartilaginous bone located on the posterior lower surface of the petrosal bone. The elongated styloid process can be palpated orally along the occlusal line in the posterior tonsillar fossa [3].

What is ANSA Cervicalis?

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. Its name means “handle of the neck” in Latin.

What does the Sternohyoid muscle do?

The sternohyoid muscle’s main function is the depression of the hyoid bone. The hyoid bone is located below the mandible, or lower jaw, and is a ‘U’ shaped bone that is partially responsible for tongue movement and the action of swallowing. The sternohyoid is one of a pair of muscles responsible for this action.

Where is the styloid process?

The styloid process is a slender pointed piece of bone just below the ear. It projects down and forward from the inferior surface of the temporal bone, and serves as an anchor point for several muscles associated with the tongue and larynx.