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The digastric muscle (also digastricus) (named digastric as it has two 'bellies') is a bilaterally paired suprahyoid muscle located under the jaw.Its posterior belly is attached to the mastoid notch of temporal bone, and its anterior belly is attached to the digastric fossa of mandible; the two bellies are united by an intermediate tendon which is held in a loop that attaches to the hyoid bone.
The four classical muscles of mastication elevate the mandible (closing the jaw) and move it forward/backward and laterally, facilitating biting and chewing. Other muscles are responsible for opening the jaw, namely the geniohyoid , mylohyoid , and digastric muscles (the lateral pterygoid may play a role).
These four muscles have different actions, but in general assist in elevating the hyoid bone and widening the esophagus during swallowing.When the two bellies of the digastric contract, they pull upward on the hyoid bone; but if the hyoid is fixed from below, the digastric assists in extreme opening of the mouth such as yawning or taking a large bite of an apple. [1]
The mylohyoid nerve (or nerve to mylohyoid) is a mixed nerve of the head.It is a branch of the inferior alveolar nerve.It provides motor innervation the mylohyoid muscle, and the anterior belly of the digastric muscle.
Being hindgut fermenters, these animals ferment cellulose in an enlarged cecum. In smaller hindgut fermenters of the order Lagomorpha (rabbits, hares, and pikas), and Caviomorph rodents ( Guinea pigs , capybaras , etc.), material from the cecum is formed into cecotropes , passed through the large intestine, expelled and subsequently reingested ...
In these reptiles, gastralia provide support for the abdomen and attachment sites for abdominal muscles. The possession of gastralia may be ancestral for Tetrapoda and were possibly derived from the ventral scales found in animals like rhipidistians , labyrinthodonts , and Acanthostega , and may be related to ventral elements of turtle plastrons .
Ohio State is now down two offensive linemen for the rest of the 2024 season. According to multiple reports, star center Seth McLaughlin suffered a torn Achilles during practice on Tuesday ...
The jaw muscles, which allow the bird to close its beak, attach to the proximal end of the lower mandible and to the bird's skull. [ 5 ] (p148) The muscles that depress the lower mandible are usually weak, except in a few birds such as the starlings and the extinct huia , which have well-developed digastric muscles that aid in foraging by ...