The Compartmental Tongue

Area of Science:

• Anatomy
• Physiology
• Biomechanics

Background:

• Traditional tongue anatomy describes 4 extrinsic and 4 intrinsic muscles.
• This model fails to explain independent tongue movements and complex shape changes.

Purpose of the Study:

• To present evidence for a finer neuromuscular structure and functional description of the tongue.
• To challenge the existing myoarchitecture model.

Main Methods:

• Reviewed studies on lingual anatomy, nerve staining, motoneuron tracing, muscle fiber types, and electromyography.
• Created a 3D atlas of muscle compartments from traced muscle fibers.
• Conducted kinematic and biomechanical studies to analyze tongue movement and control.

Main Results:

• Identified numerous neuromuscular compartments within lingual muscles (e.g., 10 in genioglossus, 6 in transversus/verticalis).
• Demonstrated independent control of five tongue body sectors.
• Showcased how synergistic muscle compartments enable precise tongue control.

Conclusions:

• The tongue possesses a detailed structure of neuromuscular compartments.
• These compartments enable coordinated positioning, shaping, and independent control of tongue sectors.
• This revised model better explains observed lingual functions.