Spry Juncture, LLC
How to Evolve Gracefully
Sternothyroid
Region
Origin & Insertion
['Origin: Posterior surface of manubrium', 'Insertion: Oblique line of thyroid cartilage']
Synergistic Muscles
['Sternohyoid', 'Omohyoid']
Joints
['None']
Primary Actions
['Depresses thyroid cartilage']
Nerve & Spinal Segment
Ansa cervicalis (C1–C3)
Cervical plexus; C1–C3
Interesting
Lies deep to sternohyoid and affects larynx movement. [Gray's Anatomy]
Reversal of Action
Anchor thyroid to initiate upward breathing lift
Common Dysfunctions
Difficulty in controlling voice pitch or vocal cord positioning
How to Stretch
Gently extend neck with chin lift.
Trigger Points
How to Strengthen
Low tone humming while extending the neck.
Concentric Action
Depresses thyroid cartilage during exhale
Applications:
Important in managing voice control and deep breathing rehab
Eccentric Action
Control rise of larynx during inhalation
Isotonic Action
Repetitive hyoid depression drills
Related Conditions
['Laryngeal tension', 'Voice strain']
Isometric Action
Hold larynx low in throat during breath control
Exercise Ideas
['Neck extension vocal hold', 'Submaximal voice training', 'Resisted swallow']