Inferior Longitudinal Lingual

Tongue · Head & Neck

The Inferior Longitudinal Lingual is found among the Tongue muscles of the Head & Neck. It arises from Root of the tongue and body of the hyoid bone and attaches to Apex of the tongue. Functionally, it shortens the tongue and curls the apex downward (makes the dorsum convex). Its nerve supply is the Hypoglossal nerve (CN XII).

Origin, Insertion, Action & Nerve

Origin

Root of the tongue and body of the hyoid bone

Insertion

Apex of the tongue

Action

Shortens the tongue and curls the apex downward (makes the dorsum convex)

Nerve

Hypoglossal nerve (CN XII)

Attachments explained

The Inferior Longitudinal Lingual is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.

Origin

Root of the tongue and body of the hyoid bone

Insertion

Apex of the tongue

Action & function

When the Inferior Longitudinal Lingual contracts, it produces the following movement: Shortens the tongue and curls the apex downward (makes the dorsum convex).

As part of the Tongue group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.

Nerve supply & clinical relevance

The Inferior Longitudinal Lingual receives its nerve supply from the Hypoglossal nerve (CN XII).

Because a muscle can only contract when its nerve is intact, injury to the Hypoglossal nerve can weaken or paralyse the Inferior Longitudinal Lingual, impairing the movements it normally produces (shortens the tongue and curls the apex downward (makes the dorsum convex)). This is why knowing the innervation is central to localising nerve lesions in clinical practice.

How to study the Inferior Longitudinal Lingual (the OIANS method)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Inferior Longitudinal Lingual, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Inferior Longitudinal Lingual fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.