QS Study

The tongue is an important organ of the body, an organ that allows you to chew, swallow, and talk. It is a muscular organ situated at the floor of the mouth. It is an important organ of the body, an organ that allows you to chew, swallow, and talk. The tongue is divided into right and left halves by a middle fibrous septum.

Nerve Supply of the Tongue according to its developmental background –

Nerve Supply

The tongue is divided into the anterior two thirds and a posterior third when discussing its innervation. It is supplied via sensory and motor pathways to both sections.

Nerve Supply of the Tongue 1

Fig: Nerve Supply of the Tongue

Sensory Supply

The anterior two thirds: The anterior two-thirds of the tongue are supplied by the lingual nerve, branch of the mandibular nerve, a nerve of the first arch. Because, it develops from the two lingual swellings and one tuberculum impar that is, from the first branchial arch. The tongue is one of those structures derived from the pharyngeal apparatus.

The posterior one third: The posterior one-third of the tongue is supplied by the glossopharyngeal nerve because it develops from the cranial half of the hypobranchial eminence that is from the 3rd arch. The oral and pharyngeal part of the tongue eventually fuses, forming a V-shaped junction known as the sulcus terminalis.

The posterior-most part: The posterior-most part of the tongue develops from the fourth arch, so it is supplied by the vagus nerve.

Motor supply

A muscle of the tongue is developed from occipital myotomes, so supplied by 12th nerve except for palatoglossus which is supplied by cranial part of the accessory nerve. All of the motor innervations is provided by hypoglossal (CN XII) except for the palatoglossus muscle which is provided by vagus CNX.

Related Study: