back of trunk muscles

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Questions and Answers

What is the primary action of the anterior part of the deltoid muscle?

  • Adducts the arm
  • Medially rotates the arm (correct)
  • Laterally rotates the arm
  • Extends the arm

Which muscle assists the deltoid in the abduction of the arm?

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

Which of the following muscles is primarily responsible for lateral rotation of the arm?

  • Deltoid
  • Teres Major
  • Infraspinatus (correct)
  • Subscapularis

What nerve innervates the Teres Major muscle?

<p>Lower subscapular nerve (B)</p> Signup and view all the answers

Which rotator cuff muscle is located on the anterior surface of the scapula?

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

What is the insertion point of the Teres Minor muscle?

<p>Greater tubercle of humerus (D)</p> Signup and view all the answers

Which action is primarily associated with the Teres Major muscle?

<p>Medial rotation of the arm (D)</p> Signup and view all the answers

What is the origin of the Supraspinatus muscle?

<p>Fossa of the scapula (C)</p> Signup and view all the answers

What action does the Subscapularis muscle perform?

<p>Medially rotates and adducts arm (C)</p> Signup and view all the answers

Which nerve innervates the infraspinatus muscle?

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

What is the primary function of the latissimus dorsi muscle?

<p>Adduction and medial rotation of the humerus (C)</p> Signup and view all the answers

Which nerve innervates the trapezius muscle?

<p>Accessory Nerve (B)</p> Signup and view all the answers

What is the insertion point of the levator scapulae muscle?

<p>Medial border of scapula above the spine (B)</p> Signup and view all the answers

Which group of muscles does the teres major belong to?

<p>Scapulo-humeral intrinsic muscles (A)</p> Signup and view all the answers

Where does the rhomboid major muscle originate?

<p>Spinous processes of T2 to T5 (D)</p> Signup and view all the answers

What is the main role of the rhomboid minor muscle?

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

Which of the following muscles is involved in the medial rotation of the humerus?

<p>Latissimus Dorsi (D)</p> Signup and view all the answers

What is the origin point for the latissimus dorsi muscle?

<p>Spinous processes of the inferior 6 thoracic vertebrae (B)</p> Signup and view all the answers

What is the significance of the thoracodorsal nerve?

<p>It innervates the latissimus dorsi muscle. (B)</p> Signup and view all the answers

Which area does the rhomboid minor insert into?

<p>Medial end of scapular spine (A)</p> Signup and view all the answers

Which muscle group includes the trapezius and latissimus dorsi?

<p>Superficial extrinsic muscles (C)</p> Signup and view all the answers

What is the primary action of the latissimus dorsi muscle?

<p>Medial rotation of the humerus (C)</p> Signup and view all the answers

Where does the levator scapulae muscle originate?

<p>Transverse processes of C1-C4 vertebrae (D)</p> Signup and view all the answers

What nerve innervates the rhomboids?

<p>Dorsal scapular nerve (C)</p> Signup and view all the answers

What is the insertion point of the rhomboid major muscle?

<p>Medial border of the scapula from the spine to the inferior angle (B)</p> Signup and view all the answers

What is the innervation of the deltoid muscle?

<p>Axillary nerve (D)</p> Signup and view all the answers

Which muscle originates from the posterior surface of the inferior angle of the scapula?

<p>Teres Major (D)</p> Signup and view all the answers

What action is primarily associated with the middle part of the deltoid muscle?

<p>Abducts the arm (B)</p> Signup and view all the answers

Which muscle does not laterally rotate the arm?

<p>Subscapularis (D)</p> Signup and view all the answers

What is the primary action of the Teres Minor muscle?

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

Which nerve innervates the Supraspinatus muscle?

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

What is the insertion point of the Infraspinatus muscle?

<p>Greater tubercle of humerus (A)</p> Signup and view all the answers

Which muscle assists with stability of the shoulder joint?

<p>Rotator cuff muscles (A)</p> Signup and view all the answers

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