Corpus: Inferior longitudinal muscle
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Synonym: Musculus longitudinalis inferior linguae
1. Definition
The Musculus longitudinalis inferior is a striated muscle that belongs to the inner tongue musculature.
2. Anatomy
The longitudinalis inferior muscle is not a clearly definable anatomical entity, but a thin layer of mostly longitudinal muscle fibres located between the genioglossus and hyoglossus muscles.
The muscle runs from the root of the tongue (radix linguae) to the tip of the tongue (apex linguae). In the posterior region, some fibres attach to the hyoid bone. Anterior parts radiate into the styloglossus muscle.
3. Innervation
The inferior longitudinal muscle is innervated by the hypoglossal nerve (nerve XII).
4. Function
The longitudinalis inferior muscle is responsible for shortening and widening the tongue and for lifting the tip of the tongue.