What action does the masseter muscle perform?
What action does the masseter muscle perform?
The masseter muscle is one of the four muscles responsible for the action of mastication (chewing). When the masseter contracts it causes powerful elevation of the mandible causing the mouth to close.
What is the action of the Mylohyoid muscle?
The mylohyoid mainly functions to elevate the hyoid bone, elevate the oral cavity, and depress the mandible. The source of motor innervation is via the mylohyoid nerve, which is a division of the inferior alveolar nerve, a branch of the mandibular division of the trigeminal nerve.
What do Suprahyoids do?
The suprahyoid muscles are those above or superior to the hyoid bones of the neck. They elevate the hyoid bone when the mandible is fixed in place, and lower the mandible when the hyoid is held firm by muscles beneath it.
What does the Stylohyoid muscle do?
The stylohyoid muscle connects the hyoid bone to the base of the mandible and the skull. It pulls the hyoid bone upward and backward, resulting in elevation of the base of the tongue and elongation of the floor of the mouth. This movement helps in deglutition.
What part of the body does the masseter move?
The masseter is one of the four muscles of the masticatory apparatus. It elevates the mandible causing a powerful jaw closure. The contraction of the superior part, which runs diagonally to the front, moves the mandible forward (protrusion).
What is the insertion of the mylohyoid muscle?
Mylohyoid muscle
| Origin | Mylohyoid line of mandible |
|---|---|
| Insertion | Mylohyoid raphe, body of hyoid bone |
| Action | Forms floor of oral cavity, elevates hyoid bone and floor of mouth, depresses mandible |
| Innervation | Nerve to mylohyoid (of inferior alveolar nerve (CN V3)) |
| Blood supply | Sublingual, inferior alveolar and submental arteries |
What is the Mylohyoid line?
Medical Definition of mylohyoid line : a ridge on the inner side of the bone of the lower jaw extending from the junction of the two halves of the bone in front to the last molar on each side and giving attachment to the mylohyoid muscle and to the superior constrictor of the pharynx. — called also mylohyoid ridge.
What is the geniohyoid muscle innervated by?
cervical nerve C1
Unlike other muscles that move the mandible at the temporomandibular joint, the geniohyoid muscles are innervated by a branch of cervical nerve C1, which “hitchhikes” from the neck along the hypoglossal nerve [XII] into the floor of the oral cavity.
What is the geniohyoid muscle?
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 stylohyoid ligament do?
Structure. The stylohyoid ligament connects the lesser horn of hyoid bone to the styloid process of the temporal bone of the skull.
What is the structure and function of the submaxillary glands?
structure and function. In salivary gland The second pair, the submaxillary glands, also called submandibular glands, are located along the side of the lower jawbone. The major duct of each (Wharton’s duct) opens into the floor of the mouth at the junction where the front of the tongue meets the mouth’s floor. A capsule of…. Read More.
What is the movement of the muscular system?
the Muscular System: Movement for the Journey 131 your muscle contracts, one of the bones will move (lower forearm) while the other (humerus) will remain stationary. The end of the muscle that is attached to the stationary bone is the point of origin, and in this example, it is at the shoulder area.
How do the local and global muscle systems work together?
Both the local and global muscle systems must work together for efficient normal function. Neither system in isolation can control the functional stability of body motion segments. The functional efficiency of a muscle is related to its ability to generate tension.
How does smooth muscle help in the movement of blood?
In addition, smooth muscle facilitates the movement of blood by changing the diameter of the blood vessels (vasoconstriction and vasodilation) and also the movement of air by changing the diameter of the airways found in our lungs.
