What do the Digastrics do?
The digastric muscle functions during swallowing, chewing, and speech. The anterior belly of the digastric is one of the three suprahyoid muscles which stabilizes the hyoid during swallowing, an action critical in protecting the airway while eating.
Where located Fossa Digastrica what is attached to it?
Digastric muscle
| Origin | Anterior belly: digastric fossa of mandible Posterior belly: mastoid notch of temporal bone |
|---|---|
| Insertion | Body of hyoid bone (via intermediate tendon and its fibrous sling) |
| Action | Depresses mandible Elevates hyoid bone during chewing, swallowing |
What is Geniohyoid?
The geniohyoid muscle is one of the suprahyoid muscles of the neck that is innervated by the ventral ramus of C1. Geniohyoid draws the hyoid bone up and forward during mastication and assists the opening of the mandible.
What does the posterior belly of digastric muscle do?
The tendon that connects the anterior and posterior bellies of the digastric muscle inserts on the hyoid bone, which is a bone located in the front, middle part of the neck. The main actions performed by the digastric muscle are to lower the mandible and elevate the hyoid bone during a swallow.
What nerve Innervates posterior belly of digastric?
Nerve Innervation The mylohyoid nerve of the inferior alveolar nerve of the mandibular nerve of the trigeminal nerve innervates the anterior belly of the digastric muscle, and the facial nerve innervates the posterior belly of the digastric muscle [10].
What causes digastric muscle pain?
Pain or discomfort in the digastric muscle may be related to muscle tears and sprains or injuries due to overuse. Some conditions which may affect the digastric muscle include myopathy, atrophy, infectious myositis, lacerations, contusions or neuromuscular diseases.
What is the origin of the Thyrohyoid?
Origin. The thyrohyoid is a paired broad, short muscle that originates along the oblique line on the lamina of the thyroid cartilage.
Why is it called Sternocleidomastoid?
The sternocleidomastoid is innervated by the accessory nerve. It is given the name sternocleidomastoid because it originates at the manubrium of the sternum (sterno-) and the clavicle (cleido-) and has an insertion at the mastoid process of the temporal bone of the skull.
Why is it called geniohyoid?
The geniohyoid muscle is a narrow muscle situated superior to the medial border of the mylohyoid muscle. It is named for its passage from the chin (“genio-” is a standard prefix for “chin”) to the hyoid bone.
What is between Mylohyoid and geniohyoid?
The sublingual space is bounded between the mylohyoid muscle and the geniohyoid and genioglossus muscles.
How do I tighten my digastric muscles?
Jutting your chin forward and tilting your head slightly upwards, place the tips of both thumbs under your chin, one in front of the other. Next, place the tip of your tongue against the roof of your mouth, gradually increasing the pressure of your tongue while holding your thumbs firmly against the muscle.
Is the posterior belly of the digastric muscle innervated?
The posterior belly of the digastric muscle is derived from the mesoderm of the second pharyngeal arch and is therefore innervated by the digastric branch of the facial nerve ( cranial nerve 7).
When does posterior pituitary dysfunction complicate postoperative course?
Anterior and posterior pituitary dysfunction can complicate the postoperative course after transsphenoidal hypophysectomy. Most frequently, posterior pituitary dysfunction occurs in the form of diabetes insipidus (DI) and rarely as the syndrome of inappropriate ADH (SIADH) secretion.
Is the digastric fossa part of the mastoid process?
The mastoid notch is a deep groove between the mastoid process and the styloid process. The mastoid notch is also referred to as the digastric groove or the digastric fossa. The posterior belly is supplied by the digastric branch of facial nerve .
How are the two bellies of the digastricus United?
The digastricus (digastric muscle) consists of two muscular bellies united by an intermediate rounded tendon. The two bellies of the digastric muscle have different embryological origins, and are supplied by different cranial nerves .