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MUSCLES-INFRAHYOID

Anatomy-Neck

MUSCLES-INFRAHYOID

1. STERNOHYOID - arises from the hyoid, inserts to the back of the sternoclavicular joint, adjoining manubrium and clavicle. The Adam's apple projects through the space b/w adjacent muscles. Supplied by a branch from the ansa cervicalis.

2. OMOHYOID - arises from the lateral part of the hyoid. Descends beneath the SCM where is lies over the carotid sheath. Where it lies over the IJV, the muscle fibers are replaced by a flat tendon. Its inferior belly attaches to the transverse scapular ligament + adjacent scapula. Supplied by a branch from the ansa cervicalis.

3. THYROHYOID - arises form the greater horn of hyoid, inserts into the oblique line of the thyroid cartilage. Supplied by the CN XII hitch-hiking the ansa cervicalis.

4. STERNOTHYROID - arises from the manubrium + first costal cartilage. Inserts into the oblique line of the thyroid cartilage. Supplied by a branch from the ansa cervicalis.

All muscles are depressors of the larynx, increasing the volume of the resonating chambers during phonation & opposing the elevators of the larynx.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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