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Superficial Muscles of the Neck
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Superficial Muscles of the Neck

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Questions and Answers

Which muscle is responsible for drawing the skin of the neck inferiorly and laterally?

  • Platysma Muscle (correct)
  • Posterior Scalene Muscle
  • Anterior Scalene Muscle
  • Sternocleidomastoid Muscle (SCM)
  • Which nerve innervates the Sternocleidomastoid Muscle (SCM)?

  • Spinal accessory nerve (CN XI) and C2-C3 spinal nerves (correct)
  • C3-C8 spinal nerves
  • Cervical branch of the facial nerve (CN VII)
  • C5-C7 spinal nerves
  • Which of the following muscles is NOT involved in flexion of the neck?

  • Platysma Muscle (correct)
  • Sternocleidomastoid Muscle (SCM)
  • Posterior Scalene Muscle
  • Anterior Scalene Muscle
  • What is the insertion point of the Anterior Scalene Muscle?

    <p>Scalene tubercle of the first rib</p> Signup and view all the answers

    Which muscle elevates the second rib and assists in inspiration?

    <p>Posterior Scalene Muscle</p> Signup and view all the answers

    What is the origin of the Sternocleidomastoid Muscle (SCM)?

    <p>Manubrium of the sternum and medial portion of the clavicle</p> Signup and view all the answers

    Which nerve innervates the Anterior Scalene Muscle?

    <p>C5-C7 spinal nerves</p> Signup and view all the answers

    What is the action of the Middle Scalene Muscle?

    <p>Elevates the first rib and assists in inspiration</p> Signup and view all the answers

    Which muscle assists in lateral flexion of the neck?

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

    What is the origin of the Platysma Muscle?

    <p>Subcutaneous tissue of the inferior border of the mandible</p> Signup and view all the answers

    Study Notes

    Superficial Muscles of the Neck

    The superficial muscles of the neck are a group of muscles located in the anterior and lateral regions of the neck. They are involved in various movements, including flexion, rotation, and lateral flexion of the neck.

    Platysma Muscle

    • Origin: Subcutaneous tissue of the inferior border of the mandible
    • Insertion: Skin of the neck and thorax
    • Action: Draws the skin of the neck inferiorly and laterally
    • Innervation: Cervical branch of the facial nerve (CN VII)

    Sternocleidomastoid Muscle (SCM)

    • Origin: Manubrium of the sternum and medial portion of the clavicle
    • Insertion: Mastoid process of the temporal bone
    • Action:
      • Rotates the head to the opposite side
      • Flexes the neck
      • Assists in lateral flexion of the neck
    • Innervation: Spinal accessory nerve (CN XI) and C2-C3 spinal nerves

    Scalene Muscles

    • Anterior Scalene Muscle:
      • Origin: Anterior tubercles of the transverse processes of C3-C6 vertebrae
      • Insertion: Scalene tubercle of the first rib
      • Action: Elevates the first rib and assists in inspiration
      • Innervation: C5-C7 spinal nerves
    • Middle Scalene Muscle:
      • Origin: Posterior tubercles of the transverse processes of C2-C7 vertebrae
      • Insertion: Scalene tubercle of the first rib
      • Action: Elevates the first rib and assists in inspiration
      • Innervation: C3-C8 spinal nerves
    • Posterior Scalene Muscle:
      • Origin: Posterior tubercles of the transverse processes of C4-C6 vertebrae
      • Insertion: External surface of the second rib
      • Action: Elevates the second rib and assists in inspiration
      • Innervation: C6-C8 spinal nerves

    Superficial Muscles of the Neck

    • Located in the anterior and lateral regions of the neck, these muscles facilitate movements such as flexion, rotation, and lateral flexion.

    Platysma Muscle

    • Origin: Subcutaneous tissue below the mandible.
    • Insertion: Skin covering the neck and thorax.
    • Action: Depresses and retracts the skin of the neck.
    • Innervation: Supplied by the cervical branch of the facial nerve (CN VII).

    Sternocleidomastoid Muscle (SCM)

    • Origin: Manubrium of sternum and medial clavicle.
    • Insertion: Mastoid process of the temporal bone.
    • Action:
      • Rotates the head to the contralateral side.
      • Flexes the neck.
      • Aids lateral flexion of the neck.
    • Innervation: Innervated by the spinal accessory nerve (CN XI) and spinal nerves C2-C3.

    Scalene Muscles

    • Anterior Scalene Muscle:

      • Origin: Anterior tubercles of the transverse processes of C3-C6 vertebrae.
      • Insertion: Scalene tubercle of the first rib.
      • Action: Elevates the first rib and assists with breathing.
      • Innervation: Innervated by C5-C7 spinal nerves.
    • Middle Scalene Muscle:

      • Origin: Posterior tubercles of the transverse processes of C2-C7 vertebrae.
      • Insertion: Scalene tubercle of the first rib.
      • Action: Elevates the first rib and assists with breathing.
      • Innervation: Innervated by C3-C8 spinal nerves.
    • Posterior Scalene Muscle:

      • Origin: Posterior tubercles of the transverse processes of C4-C6 vertebrae.
      • Insertion: External surface of the second rib.
      • Action: Elevates the second rib and assists with breathing.
      • Innervation: Innervated by C6-C8 spinal nerves.

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    Description

    Learn about the muscles in the anterior and lateral regions of the neck, involved in flexion, rotation, and lateral flexion of the neck.

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