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The posterior scalene, (Latin: scalenus posterior) is the smallest and most deeply seated of the scalene muscles. It arises, by two or three separate tendons, from the posterior tubercles of the transverse processes of the lower two or three cervical vertebrae, and is inserted by a thin tendon into the outer surface of the second rib, behind ...
Origin Insertion Innervation Sternohyoid: Posterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligament: Medial part of lower border of hyoid bone: Ansa cervicalis: Sternothyroid: Posterior surface of manubrium sterni and adjoining part of first costal cartilage: Oblique line of thyroid cartilage ...
Origin The bone or other structure the muscle is attached to that remains immobile during the action. The term "bone" is omitted from bone names. Insertion The attachment point of the muscle, on a bone or otherwise, that moves during the action. Artery The artery which supplies the muscle with blood.
The number of attachments varies; a slip may extend to the occipital or mastoid, to the trapezius, scalene or serratus anterior, or to the first or second rib. The muscle may be subdivided into several distinct parts from origin to insertion.
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).
The origin of a muscle is the bone, typically proximal, which has greater mass and is more stable during a contraction than a muscle's insertion. [14] For example, with the latissimus dorsi muscle, the origin site is the torso, and the insertion is the arm. When this muscle contracts, normally the arm moves due to having less mass than the torso.
Origin: Upper border of the scapula (inferior belly), intermediate tendon (superior belly) Insertion: Intermediate tendon (inferior belly), hyoid bone (superior belly) Artery: Branches from the inferior thyroid artery (ITA) Nerve: Ansa cervicalis (C1-C3) Actions: Depresses the larynx and hyoid bone. Also carries hyoid bone backward and to the ...
The trapezius muscle controls the action of shrugging the shoulders, and the sternocleidomastoid the action of turning the head. [8] Like most muscles, control of the trapezius muscle arises from the opposite side of the brain. [8] Contraction of the upper part of the trapezius muscle elevates the scapula. [13]