Lingual septum

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{{Infobox anatomy

| Name = Lingual septum

| Latin = septum linguae

| Image = Gray1014.png

| Caption = The mouth cavity. The cheeks have been slit transversely and the tongue pulled forward. (Lingual septum is visible at center of tongue, but not labeled.)

| Image2 = Tongue piercing.jpg

| Caption2 = A pierced tongue, which has not accommodated for swelling

| System =

| Precursor =

}}

The lingual septum consists of a vertical layer of fibrous tissue, extending throughout the entire length of the median plane of the tongue, though not quite reaching the dorsum. The lingual septum is closely associated with the hyoglossus membrane, allowing the binding of the tongue to the hyoid muscles.{{Cite journal|last1=Bordoni|first1=Bruno|last2=Morabito|first2=Bruno|last3=Mitrano|first3=Roberto|last4=Simonelli|first4=Marta|last5=Toccafondi|first5=Anastasia|date=December 2018|title=The Anatomical Relationships of the Tongue with the Body System|journal=Cureus|volume=10|issue=12|pages=e3695|doi=10.7759/cureus.3695|doi-access=free |pmid=30838167|pmc=6390887}}

Visualization through implementing a vertical groove along the tongue called the median sulcus.

It is thicker behind than in front, and occasionally contains a small fibrocartilage, about 6 mm. in length.