Thursday, June 25, 2020

Infrahyoid Muscles / Ribbon Muscles

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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