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Intrinsic and extrinsic muscles of the tongue

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Did that title get you tongue-tied? ūüėĚ You may have heard the common myth that the tongue is the¬†strongest¬†muscle in your body¬†ūüĎÖ. However, this is in fact untrue. The tongue is all muscle, but not just one muscle. It is made up of 8¬†different¬†muscles¬†that¬†combine¬†to¬†form¬†a flexible matrix¬†similar¬†to¬†an¬†elephant‚Äôs trunk¬†ūüźė.¬†The tongue¬†is¬†known as¬†a muscular hydrostat,¬†as it¬†is¬†one of the few organs in the body¬†which is composed entirely of muscle and works¬†independently¬†of the skeleton.¬†¬†

The tongue is composed of 2 main muscle groups these include: 

The intrinsic muscles of the tongue 

intrinsic muscles of tongue
Transverse and Vertical muscles

These muscles only attach to other structures in the tongue. There are 4 paired muscles, they are named based on the direction they travel.  

  • Superior longitudinal 
  • Inferior longitudinal 
  • Transverse muscles 
  • Vertical muscles 

These muscles affect the shape and size of the tongue. They play a role in guiding our speech, eating, and swallowing ūüėč. Motor innervation from the hypoglossal nerve (CNXII) allows them to carry out these functions.  

The extrinsic muscles of the tongue 

extrinsic muscles of tongue
Extrinsic muscles of the tongue
  • Genioglossus: arises from mandibular symphysis and inserts into the body of the hyoid/full length of tongue. It protrudes, depresses, and draws the tip of the tongue back and down. Innervation is from CNXII. 
  • Hyoglossus: arises from the hyoid and inserts into side of tongue. It depresses and retracts the tongue. Innervation is from CNXII.  
  • Styloglossus: originates at styloid process and temporal bone and inserts into side of tongue. It retracts and elevates the tongue. Innervation is from CNXII. 
  • Palatoglossus: arises from the palatine aponeurosis and inserts across the tongue. It elevates the posterior portion of the tongue. It is the only muscle innervated by the vagus nerve (CN X). 

To help keep¬†your¬†tongue healthy remember to¬†give it a good brush while¬†brushing your teeth¬†ūü¶∑, drink green tea¬†ūüćĶ,¬†hydrate with plenty of waterūüí¶, and monitor the color¬†(healthy=pink). ūüĎÖ