Sublingual space

The sublingual space is located below the mouth and above the mylohyoid muscle and is part of the suprahyoid group of fascial spaces.

It is shaped like an inverted V with its apex pointing anteriorly and is located between the tongue musculature superiorly and the anterior one-third of the mylohyoid muscle inferolaterally which separates it from submandibular space. 

Boundaries

• Superior: mucosa of the floor of mouth and the tongue
• Inferior: mylohyoid muscle 
• Anterolateral: medial surface of the mandible 
• Posterior: muscles along the base of the tongue (geniohyoid and genioglossus muscles) 
• Medial: intrinsic muscles of the tongue and genioglossus separate the two halves of the sublingual space. Note that anteriorly, the two sublingual spaces are communicating just below the frenulum via a small isthmus.

Contents:

• lingual artery and nerve,
• hypoglossal nerve and glossopharyngeal nerve.
• sublingual salivary gland
• deep part of the submandibular gland and the submandibular duct (Wharton's duct)
• some extrinsic tongue muscle fibers.