Shoulder Muscles Anatomy Quiz
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Shoulder Muscles Anatomy Quiz

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Questions and Answers

What is the action of the Deltoid muscle?

  • Adducts and medially rotates the arm
  • Abduction of the arm, medial/lateral rotation, and flexion/extension (correct)
  • Retracts and elevates the scapula
  • Extends and laterally rotates the arm
  • The Rhomboid Minor has its origin at the spinal processes of T2-5.

    False

    What is the insertion point of the Teres Major muscle?

    Medial lip of the intertubercular sulcus

    The ___ muscle is responsible for laterally rotating the arm.

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

    Match the following muscles with their primary action:

    <p>Rhomboid Major = Retracts scapula and elevates Supraspinatus = Arm abduction Latissimus Dorsi = Extends, adducts and medially rotates humerus Pectoralis Major = Adducts and medially rotates humerus</p> Signup and view all the answers

    Which muscle originates from the supraspinatus fossa of the scapula?

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

    The insertion of the Subscapularis muscle is the greater tubercle of the humerus.

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

    What is the action performed by the Teres Minor?

    <p>Laterally rotates arm</p> Signup and view all the answers

    The Pectoralis Minor is inserted at the ___ process of the scapula.

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

    Match the following muscles with their origin:

    <p>Teres Major = Posterior surface of the inferior angle of the scapula Deltoid = Lateral 3rd of clavicle and acromion Pectoralis Major = Medial clavicle and sternum Latissimus Dorsi = Sp of inferior 6 T vertebrae</p> Signup and view all the answers

    Which muscle is responsible for flexing and adducting the arm?

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

    The Biceps Brachii has a long head that originates from the supraglenoid tubercle of the scapula.

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

    What is the primary action of the Triceps Brachii?

    <p>extend forearm</p> Signup and view all the answers

    The Brachialis muscle flexes the forearm in all positions, including _____ position.

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

    Match the following muscles with their primary actions:

    <p>Serratus anterior = Protracts scapula Biceps Brachii = Flex and supinate arm Triceps Brachii = Extend forearm Brachialis = Flex forearm</p> Signup and view all the answers

    What is the origin of the short head of the Biceps Brachii?

    <p>Coracoid process</p> Signup and view all the answers

    The Anconeous muscle assists in flexing the forearm.

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

    What part of the humerus does the Brachialis muscle primarily attach to?

    <p>distal half of anterior surface</p> Signup and view all the answers

    The long head of the Triceps Brachii originates from the _____ tubercle of the scapula.

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

    Which muscle is located at the posterior surface of the humerus and assists in extending the forearm?

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

    Study Notes

    Shoulder Muscles

    • Trapezius (upper fibers): Originates from the base of the skull and the nuchal ligament, inserts on the lateral third of the clavicle and acromion. Elevates, extends, and rotates the scapula.
    • Trapezius (middle fibers): Originates from the spinous processes of the upper thoracic vertebrae, inserts on the spine of the scapula. Retracts the scapula.
    • Trapezius (lower fibers): Originates from the spinous processes of the lower thoracic vertebrae, inserts on the spine of the scapula. Depresses and rotates the scapula.
    • Deltoid: Originates from the lateral third of the clavicle and the acromion, inserts on the deltoid tuberosity of the humerus. Abducts, medially/laterally rotates and flexes/extends the arm (depending on the fibers).
    • Teres Minor: Originates from the middle part of the lateral border of the scapula, inserts on the inferior facet of the greater tubricle. Laterally rotates the arm.
    • Teres Major: Originates from the posterior surface of the inferior angle of the scapula, inserts on the medial lip of the intertubercular sulcus. Adducts and medially rotates the arm.
    • Rhomboid Major: Originates from the spinous processes of T2-T5, inserts on the medial border of the scapula. Retracts and elevates the scapula.
    • Rhomboid Minor: Originates from C7/T1 spinous processes and nuchal ligament, inserts on the medial border of the scapula. Retracts the scapula.
    • Latissimus Dorsi: Originates from the spinous processes of the inferior six thoracic vertebrae, thoracolumbar fascia, inferior 3 or 4 ribs, inserts on the floor of the intertubercular sulcus of the humerus. Extends, adducts and medially rotates the humerus.
    • Supraspinatus: Originates from the supraspinatus fossa of the scapula, inserts on the superior facet of the greater tubricle. Abducts the arm.
    • Infraspinatus: Originates from the infraspinatus fossa of the scapula, inserts on the middle facet of the greater tubricle of the humerus. Laterally rotates the arm.
    • Subscapularis: Originates from the subscapular fossa, inserts on the lesser tubercle. Medially rotates the arm.
    • Pectoralis Major: Originates from the medial clavicle and sternum/oblique aponeurosis, inserts on the lip of the intertubercular sulcus of the humerus. Adducts and medially rotates the humerus.
    • Pectoralis Minor: Originates from ribs 3-5 and the costal cartilages, inserts on the coracoid process of the scapula. Depresses the scapula.
    • Serratus Anterior: Originates from the anterior surfaces of ribs 1-9, inserts on the anterior surface of the medial border of the scapula. Protracts and stabilizes the scapula (also assists in upward rotation).

    Arm Muscles

    • Coracobrachialis: Originates from the tip of the coracoid process, inserts on the middle third of the medial shaft of the humerus. Flexes and adducts the arm.
    • Biceps Brachii: Originates from short head: coracoid process of the scapula and the long head: supraglenoid tubercle of the scapula, inserts on the tuberosity of the radius and the bicipital aponeurosis of the forearm. Flexes and supinates the arm (both heads).
    • Brachialis: Originates from the distal half of the anterior surface of the humerus, inserts on the coronoid process and tuberosity of the ulna. Flexes the forearm in all positions, including pronation.
    • Triceps Brachii: Originates from long head: infraglenoid tubercle of the scapula, lateral head: posterior surface of the humerus (superior to the radial groove), medial head: posterior surface of the humerus (inferior to the radial groove). Inserts on the olecranon process of the ulna and the fascia of the forearm. Extends the forearm (all heads).
    • Anconeus: Originates from the lateral epicondyle of the humerus, inserts on the lateral part of the olecranon process and the posterior surface of the ulna. Extends the forearm.

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    Description

    Test your knowledge about the muscles of the shoulder, including the trapezius and deltoid. This quiz covers the origins, insertions, and functions of each muscle. Perfect for students of anatomy or anyone interested in human muscle structure.

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