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Anatomy of the Anterior Triangle
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Anatomy of the Anterior Triangle

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Questions and Answers

Which cranial nerve innervates the tongue muscles?

  • Cranial Nerve XII (correct)
  • Cranial Nerve V
  • Cranial Nerve XI
  • Cranial Nerve X
  • What structures does the carotid sheath enclose?

  • Internal carotid artery
  • Internal jugular vein
  • Vagus nerve
  • All of the above (correct)
  • Which muscle depresses the mandible when the hyoid bone is fixed?

  • Posterior belly of the digastric muscle
  • Anterior belly of the digastric muscle (correct)
  • Mylohyoid muscle
  • Geniohyoid muscle
  • Which nerve innervates the mylohyoid muscle?

    <p>Mylohyoid nerve</p> Signup and view all the answers

    What is the function of the geniohyoid muscle?

    <p>Elevates and retracts the hyoid bone</p> Signup and view all the answers

    Which cranial nerve innervates the stylohyoid muscle?

    <p>Cranial Nerve VII</p> Signup and view all the answers

    Which cranial nerve innervates three of the four extrinsic tongue muscles?

    <p>Cranial Nerve XII</p> Signup and view all the answers

    Which gland is a major salivary gland?

    <p>Submandibular gland</p> Signup and view all the answers

    Where does the submandibular duct drain the submandibular gland?

    <p>Mouth lateral to frenulum tongue</p> Signup and view all the answers

    Which artery has no branches in the neck?

    <p>Internal Carotid Artery</p> Signup and view all the answers

    Which muscle attaches to the sternum inferiorly and hyoid bone superiorly?

    <p>Sternohyoid Muscle</p> Signup and view all the answers

    Which nerve innervates the infrahyoid muscles?

    <p>Ansa Cervicalis Nerve</p> Signup and view all the answers

    Which nerve provides sensory innervation to the larynx?

    <p>Internal Laryngeal Nerve</p> Signup and view all the answers

    Which nerve provides motor innervation to the cricothyroid muscle?

    <p>External Laryngeal Nerve</p> Signup and view all the answers

    Which nerve provides sensory innervation to the larynx and motor innervation to all intrinsic laryngeal muscles except the cricothyroid muscle?

    <p>Recurrent Laryngeal Nerve</p> Signup and view all the answers

    Which muscle is not innervated by the Ansa Cervicalis Nerve?

    <p>Sternothyroid Muscle</p> Signup and view all the answers

    Which nerve provides autonomic (parasympathetic) innervation to thoracic organs?

    <p>Cranial Nerve X</p> Signup and view all the answers

    Which nerve is located within the 'carotid sheath'?

    <p>Cranial Nerve X</p> Signup and view all the answers

    Which muscle is not part of the infrahyoid region?

    <p>Sternocleidomastoid Muscle</p> Signup and view all the answers

    Which muscle attaches to the thyroid cartilage inferiorly and hyoid bone superiorly?

    <p>Thyrohyoid Muscle</p> Signup and view all the answers

    Study Notes

    Cranial Nerves and Tongue Muscles

    • The hypoglossal nerve (CN XII) innervates the tongue muscles.

    Carotid Sheath

    • The carotid sheath encloses the common carotid artery, internal carotid artery, and vagus nerve (CN X).

    Mandible and Hyoid Bone

    • The digastric muscle depresses the mandible when the hyoid bone is fixed.

    Mylohyoid Muscle

    • The mylohyoid muscle is innervated by the nerve to the mylohyoid (a branch of the mandibular division of the trigeminal nerve, CN V3).

    Geniohyoid Muscle

    • The geniohyoid muscle elevates the hyoid bone and depresses the mandible.

    Stylohyoid Muscle

    • The stylohyoid muscle is innervated by the facial nerve (CN VII).

    Extrinsic Tongue Muscles

    • The hypoglossal nerve (CN XII) innervates three of the four extrinsic tongue muscles.

    Salivary Glands

    • The submandibular gland is a major salivary gland.

    Submandibular Duct

    • The submandibular duct drains the submandibular gland into the oral cavity.

    Neck Anatomy

    • The common carotid artery has no branches in the neck.

    Muscle Attachments

    • The sternohyoid muscle attaches to the sternum inferiorly and hyoid bone superiorly.

    Infrahyoid Muscles

    • The infrahyoid muscles are innervated by the ansa cervicalis nerve.

    Laryngeal Innervation

    • The vagus nerve (CN X) provides sensory innervation to the larynx.
    • The recurrent laryngeal nerve (a branch of the vagus nerve, CN X) provides motor innervation to the cricothyroid muscle.
    • The recurrent laryngeal nerve (a branch of the vagus nerve, CN X) provides sensory innervation to the larynx and motor innervation to all intrinsic laryngeal muscles except the cricothyroid muscle.

    Ansa Cervicalis Nerve

    • The thyrohyoid muscle is not innervated by the ansa cervicalis nerve.

    Autonomic Innervation

    • The vagus nerve (CN X) provides autonomic (parasympathetic) innervation to thoracic organs.

    Carotid Sheath Contents

    • The vagus nerve (CN X) is located within the carotid sheath.

    Infrahyoid Region

    • The thyrohyoid muscle is not part of the infrahyoid region.

    Muscle Attachments

    • The thyrohyoid muscle attaches to the thyroid cartilage inferiorly and hyoid bone superiorly.

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    Description

    Test your knowledge of the boundaries and structures within the anterior triangle of the neck. Explore the infrahyoid region and learn about the muscles and nerves involved.

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