Shoulder and Face Muscles Overview
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Questions and Answers

Which of the following muscles is responsible for the medial rotation of the arm?

  • Subscapularis (correct)
  • Supraspinatus
  • Infraspinatus
  • Teres Minor

    • The temporalis muscle is primarily involved in closing the eye.

    False (B)

    Which muscle is responsible for the abduction of the arm?

    Supraspinatus

    The occipito-frontalis muscle is responsible for raising the eyebrows and wrinkling the ______.

    <p>forehead</p> Signup and view all the answers

    Match the following muscles with their action:

    <p>Subscapularis = Medial rotation of arm Teres Minor = Lateral rotation of arm Masseters = Mastication Orbicularis oris = Closes mouth</p> Signup and view all the answers

    All of the following muscles insert on the humerus EXCEPT:

    <p>Orbicularis oris (B)</p> Signup and view all the answers

    The rotator cuff muscles help keep the head of the humerus closely connected to the socket of the scapula.

    <p>True (A)</p> Signup and view all the answers

    Which two muscles listed are primarily responsible for mastication (chewing)?

    <p>Temporalis and Masseters</p> Signup and view all the answers

    Flashcards

    Subscapularis

    Muscle responsible for medial rotation of the arm originating from the scapula and inserting on the front of the humerus.

    Teres Minor

    Muscle that performs lateral rotation of the arm; originates from the back of the scapula and inserts on the back of the humerus.

    Infraspinatus

    Muscle responsible for lateral rotation of the arm, originating from the back of the scapula and inserting on the back of the humerus.

    Supraspinatus

    Muscle that abducts the arm, originating from the scapula and inserting on the humerus.

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    Temporalis

    Muscle that aids in chewing, originating from the temporal bone and inserting on the mandible.

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    Masseters

    Muscles involved in mastication, originating from the zygomatic arch and mandible, inserting on the mandible.

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    Occipito-frontalis

    Muscle that raises eyebrows and moves the scalp, originating from the occipital and frontal bones and inserting on the skin over scalp.

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    Orbicularis Oculi

    Muscle that closes the eye, originating from the eye socket and inserting on the rim of the eye socket.

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    Study Notes

    Rotator Cuff Muscles

    • The rotator cuff muscles (subscapularis, infraspinatus, teres minor, supraspinatus) keep the humerus head closely connected to the scapula socket
    • These muscles are important for proper shoulder function, similar to ligaments in the hip

    Shoulder Muscles: Actions

    • Subscapularis: Medial rotation of the arm
    • Supraspinatus: Abduction of the arm, and helps with lifting the arm
    • Infraspinatus: Lateral rotation of the arm
    • Teres Minor: Lateral rotation of the arm

    Face Muscles

    • Temporalis: Mastication (chewing)
    • Masseters: Mastication (chewing)
    • Occipito-frontalis: Raises eyebrows, wrinkles forehead, and moves scalp
    • Orbicularis oculi: Closes the eye
    • Orbicularis oris: Closes the mouth

    Additional Notes

    • The temporal bone and the mandible are important parts for mastication.
    • The zygomatic arch is also involved in mastication.
    • The tendons over the scalp are important for eyebrow movement.
    • The rim of the eye socket is critical for eye movement.
    • Sphincter muscles around the mouth allow for lip movements.

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    Description

    This quiz covers the anatomy and functions of the shoulder and face muscles, including the rotator cuff and muscles involved in mastication. Learn about the roles of key muscles like the subscapularis and temporalis in daily activities. Perfect for students of anatomy and physiology.

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