Podcast
Questions and Answers
Which statement accurately contrasts the actions of the sternothyroid and thyrohyoid muscles?
Which statement accurately contrasts the actions of the sternothyroid and thyrohyoid muscles?
- The sternothyroid and thyrohyoid both depress the larynx, but only the thyrohyoid can elevate the hyoid bone.
- The sternothyroid depresses the larynx, while the thyrohyoid elevates it, assuming the hyoid bone is fixed. (correct)
- The sternothyroid elevates the larynx, while the thyrohyoid depresses it, assuming the hyoid bone is fixed.
- The sternothyroid depresses the hyoid bone, while the thyrohyoid elevates the larynx, regardless of fixation.
What structural feature distinguishes the omohyoid muscle from the other infrahyoid muscles?
What structural feature distinguishes the omohyoid muscle from the other infrahyoid muscles?
- Its primary insertion point is on the thyroid cartilage rather than the hyoid bone.
- It runs superficial to both the sternohyoid and sternothyroid muscles throughout its entire course.
- It possesses two bellies separated by an intermediate tendon, anchored by a fascial sling to the clavicle. (correct)
- It is the only infrahyoid muscle that does not directly attach to either the sternum or the thyroid cartilage.
If the sternohyoid muscle was selectively paralyzed, which action involving the hyoid bone would be most compromised?
If the sternohyoid muscle was selectively paralyzed, which action involving the hyoid bone would be most compromised?
- Fixation of the hyoid bone during tongue movement.
- Lateral movement of the hyoid bone during chewing.
- Depression of the hyoid bone after swallowing. (correct)
- Elevation of the hyoid bone during speech.
A surgeon needs to access the sternothyroid muscle. Which of the following muscles must be carefully retracted to expose it?
A surgeon needs to access the sternothyroid muscle. Which of the following muscles must be carefully retracted to expose it?
How does the anatomical positioning of the omohyoid muscle relate to the triangles of the neck?
How does the anatomical positioning of the omohyoid muscle relate to the triangles of the neck?
Considering the combined actions of the infrahyoid muscles, what is their overarching contribution to laryngeal function during speech and swallowing?
Considering the combined actions of the infrahyoid muscles, what is their overarching contribution to laryngeal function during speech and swallowing?
Which of the following muscles, if damaged, would MOST directly impair both laryngeal elevation and hyoid depression?
Which of the following muscles, if damaged, would MOST directly impair both laryngeal elevation and hyoid depression?
How does the fascial sling associated with the omohyoid muscle's intermediate tendon contribute to neck stability and function?
How does the fascial sling associated with the omohyoid muscle's intermediate tendon contribute to neck stability and function?
A patient presents with difficulty in both depressing the hyoid bone and drawing the larynx downwards. Which combination of infrahyoid muscle impairments could explain these symptoms?
A patient presents with difficulty in both depressing the hyoid bone and drawing the larynx downwards. Which combination of infrahyoid muscle impairments could explain these symptoms?
In a patient with a severely fractured hyoid bone, which infrahyoid muscle's function would be LEAST directly affected?
In a patient with a severely fractured hyoid bone, which infrahyoid muscle's function would be LEAST directly affected?
Flashcards
Sternohyoid Muscle
Sternohyoid Muscle
Depresses the hyoid bone, located from hyoid to the sternoclavicular joint.
Omohyoid Muscle
Omohyoid Muscle
Depresses/fixes the hyoid bone; has superior/inferior bellies separated by an intermediate tendon.
Thyrohyoid Muscle
Thyrohyoid Muscle
Depresses the hyoid bone (if larynx is fixed) or elevates the larynx (if hyoid is fixed).
Sternothyroid Muscle
Sternothyroid Muscle
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Infrahyoid Muscles
Infrahyoid Muscles
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Study Notes
Infrahyoid Muscles Overview
- Infrahyoid muscles depress the hyoid bone, which is the opposite action of the suprahyoid muscles.
- This muscle group contains four muscles.
- The infrahyoid muscles are also known as strap muscles.
- The four muscles are the sternohyoid, omohyoid, thyrohyoid, and sternothyroid.
Sternohyoid
- It extends from the hyoid bone to the posterior aspect of the sternoclavicular joint.
- This muscle depresses the hyoid bone after swallowing.
Omohyoid
- Originates on the superior border of the scapula, medial to the suprascapular notch.
- It runs through the posterior triangle into the anterior triangle and inserts onto the hyoid bone.
- This muscle depresses and fixes the hyoid bone.
- It has two bellies, superior and inferior, which are separated by an intermediate tendon.
- A fascial sling attaches the intermediate tendon to the medial end of the clavicle.
- Lies lateral to the sternohyoid muscle.
Thyrohyoid
- It originates on the oblique line on the lamina of the thyroid cartilage.
- This muscle attaches to the hyoid bone.
- When the larynx is fixed, it depresses the hyoid bone.
- When the hyoid bone is fixed, it elevates the larynx.
Sternothyroid
- It attaches to the sternum and the thyroid.
- This muscle draws the larynx downwards.
- It runs in continuity with the thyrohyoid, deep to the omohyoid and sternohyoid.
Recap of Infrahyoid Muscles
- The four infrahyoid muscles: sternohyoid, omohyoid, thyrohyoid, and sternothyroid.
- The omohyoid is superficial and lateral to the sternohyoid.
- The omohyoid runs from the scapula through the posterior triangle and inserts onto the hyoid bone.
- The thyrohyoid and sternothyroid muscles are located deep to the omohyoid and sternohyoid.
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