Innervation: The anterior belly is innervated by the inferior alveolar nerve, a branch of the mandibular nerve (which is derived from the trigeminal nerve, CN V). The posterior belly is innervated by the digastric branch of the facial nerve.
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.
Also, which of the Suprahyoid muscles forms the floor of the mouth? All suprahyoid muscles contribute to the floor of the mouth but the actual muscle plate which bridges between the two rami of mandible is formed by the mylohyoid muscles (oral diaphragm). From above the mouth floor is reinforced by the geniohyoid muscles and from below by the anterior bellies of the digastric muscles.
Consequently, what are the Suprahyoid muscles?
The suprahyoid muscles are four muscles located above the hyoid bone in the neck. They are the digastric, stylohyoid, geniohyoid, and mylohyoid muscles. They are all pharyngeal muscles, with the exception of the geniohyoid muscle.
What is the functional difference between Suprahyoid muscles and Infrahyoid muscles?
13.11). Both groups of muscles are involved with depression of the mandible and subsequent opening of the mouth, movement of the tongue, swallowing, and speaking. The infrahyoid muscles stabilize the hyoid bone so that the suprahyoid muscles have a firm base to assist with depression of the mandible.
Why does my Digastric muscle hurt?
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.
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. Some people also experience tinnitus and neck pain.
What nerve Innervates the Digastric muscle?
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.
What organ is controlled by the Styloglossus muscle?
How do you stretch your Digastric muscle?
To passively stretch the posterior belly of the digastric, the patient leads the head back against the practitioner in a relaxed position with the teeth nearly approximated. For stretching of the right posterior digastric, the patient’s head is turned to the right to move the mastoid process away from the hyoid bone.
Which muscles extend the neck?
Splenius capitis and splenius cervicis are a pair of superficial muscles in the back of the neck. Bilateral contraction of these muscles produces extension of the neck.
Where does nerve to Mylohyoid come from?
The nerve to the mylohyoid (NM) originates from the mandibular division of the trigeminal nerve. The NM provides motor control to the mylohyoid and the anterior belly of the digastric. Its sensory component, as a variation of this nerve, has scantly been described in the literature.
What does the Hyoglossus muscle do?
It inserts into the side and inferior aspect of the tongue. Hyoglossus is innervated by the hypoglossal nerve (CN XII). The muscle acts to depress the lateral sides of the tongue inferiorly. Also, it weakly retracts the protracted tongue.
Why does my hyoid bone hurt?
The painful symptoms are generally caused by trauma at the greater cornu of the hyoid bone with the pain radiating to other sites. Treatment for the condition ranges from injections of local anesthetic or cortisone to resection of the greater cornu.
Which muscles insert on the hyoid bone?
A large number of muscles attach to the hyoid: Superior. Middle pharyngeal constrictor muscle. Hyoglossus muscle. Genioglossus. Intrinsic muscles of the tongue. Suprahyoid muscles. Digastric muscle. Stylohyoid muscle. Geniohyoid muscle. Mylohyoid muscle. Inferior. Thyrohyoid muscle. Omohyoid muscle. Sternohyoid muscle.
What muscles depress the mandible?
Muscles that depress the mandible and thus open the jaw include the anterior digastric, mylohyoid, and inferior head of the lateral pterygoid. Jaw-closer muscles consist of the masseter, temporalis, medial pterygoid, and superior head of the lateral pterygoid.
What muscle raises the eyebrows?
What are the Suboccipital muscles?
Anatomical terms of muscle The suboccipital muscles are a group of muscles defined by their location to the occiput. Suboccipital muscles are located below the occipital bone. These are four paired muscles on the underside of the occipital bone; the two straight muscles (rectus) and the two oblique muscles (obliquus).