Podcast
Questions and Answers
What is the primary action of the digastric muscle?
What is the primary action of the digastric muscle?
Which nerve innervates the posterior belly of the digastric muscle?
Which nerve innervates the posterior belly of the digastric muscle?
What is the origin of the stylohyoid muscle?
What is the origin of the stylohyoid muscle?
Which action is not performed by the mylohyoid muscle?
Which action is not performed by the mylohyoid muscle?
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What is the primary function of the omohyoid muscle?
What is the primary function of the omohyoid muscle?
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Which muscle's insertion is at the thyroid cartilage of the larynx?
Which muscle's insertion is at the thyroid cartilage of the larynx?
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What is the innervation of the geniohyoid muscle?
What is the innervation of the geniohyoid muscle?
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Which of the following muscles acts to depress the hyoid bone?
Which of the following muscles acts to depress the hyoid bone?
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What action does the thyrohyoid muscle perform?
What action does the thyrohyoid muscle perform?
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Which muscle functions to elevate the hyoid bone and draw it posteriorly?
Which muscle functions to elevate the hyoid bone and draw it posteriorly?
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Study Notes
Suprahyoid Muscles
- Elevates hyoid bone, oral cavity floor, and tongue during swallowing.
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Digastric:
- Origin: Anterior belly: Inner side of mandible's inferior border. Posterior belly: Temporal bone.
- Insertion: Body of hyoid bone (via an intermediate tendon).
- Action: Elevates hyoid bone and depresses mandible (opening mouth).
- Innervation: Anterior belly: Mandibular nerve (CN V); Posterior belly: Facial nerve (CN VII)
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Stylohyoid:
- Origin: Styloid process of temporal bone.
- Insertion: Body of hyoid bone.
- Action: Elevates hyoid bone posteriorly.
- Innervation: Facial nerve (CN VII)
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Mylohyoid:
- Origin: Inner surface of mandible.
- Insertion: Body of hyoid bone.
- Action: Elevates hyoid bone and oral cavity floor, depresses mandible.
- Innervation: Mandibular nerve (CN V3)
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Geniohyoid:
- Origin: Mental spine of mandible.
- Insertion: Body of hyoid bone.
- Action: Elevates hyoid bone, draws hyoid bone and tongue anteriorly, depresses mandible.
- Innervation: C1 spinal nerve via hypoglossal nerve (CN XII)
Infrahyoid Muscles
- Depresses hyoid bone.
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Omohyoid:
- Origin: Superior border of scapula and transverse ligament.
- Insertion: Body of hyoid bone.
- Action: Depresses hyoid bone.
- Innervation: Spinal nerves C1-C3
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Sternohyoid:
- Origin: Medial end of clavicle and manubrium of sternum.
- Insertion: Body of hyoid bone.
- Action: Depresses hyoid bone.
- Innervation: Spinal nerves C1-C3
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Sternothyroid:
- Origin: Manubrium of sternum.
- Insertion: Thyroid cartilage of larynx.
- Action: Depresses thyroid cartilage.
- Innervation: Spinal nerves C1-C3
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Thyrohyoid:
- Origin: Thyroid cartilage of larynx.
- Insertion: Greater horn of hyoid bone.
- Action: Elevates thyroid cartilage and depresses hyoid bone.
- Innervation: Spinal nerves C1-C2 and descending hypoglossal nerve (CN XII)
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Description
Explore the anatomy and functions of the suprahyoid muscles, including the digastric, stylohyoid, mylohyoid, and geniohyoid muscles. This quiz covers the origins, insertions, actions, and innervations of these essential muscles involved in swallowing. Test your knowledge and deepen your understanding of head and neck anatomy.
