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The hyoglossus is a thin and quadrilateral extrinsic muscle of the tongue. It originates from the hyoid bone; it inserts onto the side of the tongue. It is innervated by the hypoglossal nerve (cranial nerve XII). It acts to depress and retract the tongue.
The chondroglossus muscle is about 2 cm long. It arises from the medial side and base of the lesser horn of the hyoid bone. [1] It passes directly upward. [1] It then inserts by blending with the intrinsic muscles of the tongue, between the hyoglossus and genioglossus. [1] The chondroglossus muscle is sometimes described as a part of the ...
The hypoglossal nerve provides motor control of the extrinsic muscles of the tongue: genioglossus, hyoglossus, styloglossus, and the intrinsic muscles of the tongue. [2] These represent all muscles of the tongue except the palatoglossus muscle, which is innervated by the vagus nerve. [2] The hypoglossal nerve is of a general somatic efferent ...
2) Mastication. Food is mechanically broken down by the action of the teeth controlled by the muscles of mastication (V 3) acting on the temporomandibular joint. This results in a bolus which is moved from one side of the oral cavity to the other by the tongue. Buccinator (VII) helps to contain the food against the occlusal surfaces of the teeth.
It is a fan-shaped muscle that comprises the bulk of the body of the tongue. It arises from the mental spine of the mandible; it inserts onto the hyoid bone, and the bottom of the tongue. It is innervated by the hypoglossal nerve (cranial nerve XII). The genioglossus is the major muscle responsible for protruding (or sticking out) the tongue.
It begins by numerous branches from the superficial surface of the gland, and runs forward between the mylohyoid, hyoglossus, and genioglossus muscles. It then passes between the sublingual gland and the genioglossus and opens by a narrow opening on the summit of a small papilla (the "sublingual caruncle") at the side of the frenulum of the tongue.
The inferior longitudinal muscle of the tongue is an intrinsic muscle of the tongue. [1] It is thin and oval in cross-section. It is situated between the paramedian septum, and the lateral septum. [2] It extends from the root to the apex of the tongue. Posteriorly, some of its fibers attach onto the body of the hyoid bone.
The tongue's upper surface (dorsum) is covered by taste buds housed in numerous lingual papillae. It is sensitive and kept moist by saliva and is richly supplied with nerves and blood vessels. The tongue also serves as a natural means of cleaning the teeth. [2] A major function of the tongue is to enable speech in humans and vocalization in ...