The inferior longitudinal muscle of tongue is an intrinsic muscle of the

tongue The tongue is a muscular organ in the mouth of a typical tetrapod. It manipulates food for mastication and swallowing as part of the digestive process, and is the primary organ of taste. The tongue's upper surface (dorsum) is covered by taste ...

. It is situated on the under surface of the

between the

genioglossus The genioglossus is one of the paired extrinsic muscles of the tongue. The genioglossus is the major muscle responsible for protruding (or sticking out) the tongue. Structure Genioglossus is the fan-shaped extrinsic tongue muscle that forms the ma ...

and

hyoglossus The hyoglossus, thin and quadrilateral, arises from the side of the body and from the whole length of the greater cornu of the hyoid bone, and passes almost vertically upward to enter the side of the tongue, between the styloglossus and the in ...

. It helps to move the tongue.

Structure

The inferior longitudinal muscle of the tongue is an

intrinsic muscle Anatomical terminology is used to uniquely describe aspects of skeletal muscle, cardiac muscle, and smooth muscle such as their actions, structure, size, and location. Types There are three types of muscle tissue in the body: skeletal, smooth, ...

of the

. It extends from the root to the apex of the tongue. Behind, some of its fibers are connected with the body of the

hyoid bone The hyoid bone (lingual bone or tongue-bone) () is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid cartilage. At rest, it lies between the base of the mandible and the third cervical verteb ...

. In front, it blends with the fibers of styloglossus.

Nerve supply

The inferior longitudinal muscle of the tongue is supplied by the

hypoglossal nerve The hypoglossal nerve, also known as the twelfth cranial nerve, cranial nerve XII, or simply CN XII, is a cranial nerve that innervates all the extrinsic and intrinsic muscles of the tongue except for the palatoglossus, which is innervated ...

(CN XII).

Function

The inferior longitudinal muscle of the tongue moves the

. Movement of material through the

pharynx The pharynx (plural: pharynges) is the part of the throat behind the mouth and nasal cavity, and above the oesophagus and trachea (the tubes going down to the stomach and the lungs). It is found in vertebrates and invertebrates, though its st ...

is dependent upon the coordinated activity of the longitudinal and smooth muscle of the gut.

Additional images

File:Musculuslongitudinalisinferiorlinguae.png

References

Muscles of the head and neck Tongue {{muscle-stub