What is the sternothyroid muscle?
What is the sternothyroid muscle?
The sternothyroid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing.
What does sternothyroid mean in anatomy?
Medical Definition of sternothyroid : an infrahyoid muscle on each side of the body below the sternohyoid that arises from the sternum and from the cartilage of the first and sometimes of the second ribs, inserts into the thyroid cartilage, and acts to draw the larynx downward by depressing the thyroid cartilage.
Where does the sternothyroid muscle attach?
Sternothyroid. The sternothyroid muscle is wider and deeper than the sternohyoid. It is located within the deep plane. Attachments: Arises from the manubrium of the sternum, and attaches to the thyroid cartilage.
Which muscle depresses the thyroid cartilage?
The sternothyroid muscles are situated beneath sternohyoideus muscle; they arises from the sternum and first rib and goes to the lamina of the thyroid cartilage, and are innervated by the ansa cervicalis. These muscles depress the larynx.
Why is it called Sternothyroid?
The sternothyroid arises from the posterior surface of the manubrium of the sternum, below the origin of the sternohyoid. It also arises from the edge of the cartilage of the first rib.
Are there two Sternohyoid muscles?
The sternohyoid muscle runs from the dorsal manubrium to the ventrocaudal hyoid bone, with attachments to the sternoclavicular joint capsule, and the sternothyroid muscle attaches along the dorsal midline of the manubrium.
What is the action of the sternohyoid muscle?
This group of muscles contains four main muscles: the omohyoid muscle, the sternohyoid muscle, the sternothyroid muscle, and the thyrohyoid muscle. The primary function of this group of muscles is to depress the hyoid bone during speech and swallowing.
Where is the cricoid cartilage?
larynx
The cricoid cartilage is a ring of hyaline cartilage located at the inferior aspect of the larynx and is the only complete ring of cartilage around the trachea.
Why is it called sternothyroid?
What are the 4 Infrahyoid muscles?
There are four strap muscles:
- thyrohyoid: deep and lateral.
- omohyoid: superficial and lateral.
- sternohyoid: superficial and medial.
- sternothyroid: deep and medial.
What is an Arytenoid cartilage?
Introduction. The arytenoid cartilages are paired pyramid-shaped structures of cartilage found in the larynx, which are essential to the production of vocal sound. They are located on the lateral part of the superior border of the lamina of the cricoid cartilage and help form the cricoarytenoid joints.
How do you stretch the Sternothyroid muscle?
Slowly move the ear toward the shoulder while the hands stay behind the back. Keep the shoulders down and the hands behind the back. Do not lift the shoulders up when tilting the head to the side. Hold the stretch for at least 20 seconds.
Where does the sternothyroid enter the thyroid cartilage?
At its origin, the muscle is in contact with the contralateral sternothyroid. However, the vertically oriented fibers diverge as they travel superiorly to insert on the oblique line of the thyroid cartilage.
What is the function of the sternothyroid muscle?
When acting alone, the sternothyroid muscle pulls the lamina of the thyroid cartilage away from the hyoid bone, thus opening the laryngeal inlet. This is particularly beneficial during forced inspiration so that air enters the lower airway. The sternothyroid muscle may be divided during thyroidectomy (removal of the diseased thyroid gland ).
Which is the cranial extension of the sternothyroid?
This article will discuss the anatomy and function of the thyrohyoid muscle. Thyrohyoid is considered as a cranial extension of sternothyroid. It originates from the oblique line of the lamina of thyroid cartilage, where sternothyroid ends.
Where does the thyrohyoid muscle originate in the thyroid?
Thyrohyoid muscle. The thyrohyoid muscle is deep to the superior belly of the omohyoid muscle and sternohyoid muscle. It originates end to end on the oblique line of the thyroid cartilage with the sternothyroid muscle.
What is the sternothyroid muscle? The sternothyroid is a paired, flat strap of muscle that serves to fix the hyoid bone as well as depressing the larynx in phonation and in the terminal phase of swallowing. What does sternothyroid mean in anatomy? Medical Definition of sternothyroid : an infrahyoid muscle on each side of the…