Superior longitudinal muscle of tongue
The superior longitudinal muscle of the tongue is one of the intrinsic muscles of the tongue. It is a thin layer of oblique and longitudinal fibers situated beneath the mucous membrane on the dorsum of the tongue.
Structure[edit]
The superior longitudinal muscle originates from the submucous fibrous layer near the epiglottis and the median fibrous septum of the tongue. It extends forward to the edges of the tongue, where it inserts.
Innervation[edit]
The muscle is innervated by the hypoglossal nerve (cranial nerve XII), which is responsible for motor control of the tongue.
Function[edit]
The primary function of the superior longitudinal muscle is to retract and broaden the tongue. It also helps in elevating the tip of the tongue, which is essential for articulation and swallowing.
Clinical significance[edit]
Dysfunction of the superior longitudinal muscle can affect speech and swallowing. Damage to the hypoglossal nerve can lead to atrophy or paralysis of the muscle, resulting in difficulties with tongue movements.
