The infrahyoid muscles are:
- a. Sternohyoid
- b. Sternothyroid
- c. Thyrohyoid
- d. Omohyoid.
These ribbon muscles have the following general
features.
- a. They are arranged in two layers, superficial (sternohyoid and omohyoid) and deep (sternothyroid and thyrohyoid).
- b. All of them are supplied by the ventral rami of first, second and third cervical spinal nerves.
- c. Because of their attachment to the hyoid bone and to the thyroid cartilage, they move these structures.
- d. Sternohyoid, superior belly of omohyoid, sternothyroid lie superficial to the lateral or superficial convex surface of the thyroid gland.
- e. The anterior surface of isthmus of thyroid gland is covered by right and left sternothyroid and sternohyoid muscles.
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