Podcast
Questions and Answers
Which anatomical structure serves as the origin point for the omohyoid muscle?
Which anatomical structure serves as the origin point for the omohyoid muscle?
- Superior border of the scapula, medial to the suprascapular notch (correct)
- Manubrium of the sternum
- Oblique line on the thyroid cartilage
- Posterior aspect of the sternoclavicular joint
The sternohyoid muscle's primary function is to elevate the hyoid bone during speech.
The sternohyoid muscle's primary function is to elevate the hyoid bone during speech.
False (B)
Describe the dual action of the thyrohyoid muscle and explain the conditions that dictate each action.
Describe the dual action of the thyrohyoid muscle and explain the conditions that dictate each action.
The thyrohyoid muscle either depresses the hyoid bone when the larynx is fixed or elevates the larynx when the hyoid bone is fixed, showcasing its context-dependent function.
The omohyoid muscle is unique due to its two bellies, the superior belly and the inferior belly, separated by an ______ tendon.
The omohyoid muscle is unique due to its two bellies, the superior belly and the inferior belly, separated by an ______ tendon.
Match each infrahyoid muscle to its primary attachment points:
Match each infrahyoid muscle to its primary attachment points:
What is the functional significance of the fascial sling that attaches the intermediate tendon of the omohyoid to the clavicle?
What is the functional significance of the fascial sling that attaches the intermediate tendon of the omohyoid to the clavicle?
The sternothyroid muscle directly influences the position of the hyoid bone by attaching to it.
The sternothyroid muscle directly influences the position of the hyoid bone by attaching to it.
Explain how the arrangement of the sternothyroid and thyrohyoid muscles relative to the omohyoid and sternohyoid muscles affects their integrated function.
Explain how the arrangement of the sternothyroid and thyrohyoid muscles relative to the omohyoid and sternohyoid muscles affects their integrated function.
Infrahyoid muscles are often referred to as ______ muscles due to their distinct physical appearance.
Infrahyoid muscles are often referred to as ______ muscles due to their distinct physical appearance.
Which statement accurately contrasts the positioning of the sternohyoid and omohyoid muscles?
Which statement accurately contrasts the positioning of the sternohyoid and omohyoid muscles?
Flashcards
Infrahyoid Muscles Function
Infrahyoid Muscles Function
Depress the hyoid bone, opposing the action of suprahyoid muscles.
Infrahyoid Muscles
Infrahyoid Muscles
Sternohyoid, omohyoid, thyrohyoid, and sternothyroid.
Sternohyoid Muscle
Sternohyoid Muscle
Extends from the hyoid bone to the posterior aspect of the sternoclavicular joint. Depresses the hyoid after swallowing.
Omohyoid Muscle
Omohyoid Muscle
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Thyrohyoid Muscle
Thyrohyoid Muscle
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Sternothyroid Muscle
Sternothyroid Muscle
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Study Notes
Infrahyoid Muscles Overview
- Infrahyoid muscles work against the suprahyoid muscles by depressing the hyoid bone.
- These muscles, known as strap muscles, consist of four muscles.
- The sternohyoid, omohyoid, thyrohyoid, and sternothyroid form the infrahyoid muscle group.
Sternohyoid Muscle
- The sternohyoid muscle links the hyoid bone to the sternoclavicular joint's posterior aspect.
- As its name suggests, it connects to both the hyoid bone and the sternum.
- It helps lower the hyoid bone after swallowing.
Omohyoid Muscle
- The omohyoid muscle starts at the scapula's superior border, just medial to the suprascapular notch.
- It crosses from the posterior to the anterior triangle and attaches to the hyoid bone.
- The omohyoid muscle is responsible for depressing and stabilizing the hyoid bone.
- It features two bellies—superior and inferior—divided by an intermediate tendon.
- The intermediate tendon is secured by a fascial sling to the clavicle's medial end.
- The omohyoid is positioned lateral to the sternohyoid.
Thyrohyoid and Sternothyroid Muscles
- The thyrohyoid muscle begins at the oblique line of the thyroid cartilage and connects to the hyoid bone.
- The action of the thyrohyoid varies depending on whether the larynx or hyoid is fixed.
- It depresses the hyoid bone when the larynx is fixed, and elevates the larynx when the hyoid bone is fixed.
- The sternothyroid muscle links the sternum and the thyroid.
- This muscle pulls the larynx downward.
- The sternothyroid and thyrohyoid run continuously, located deep to the omohyoid and sternohyoid.
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