Deltoid Muscle Anatomy
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Questions and Answers

What is the attachment point of the deltoid muscle on the humerus?

  • Lateral epicondyle of humerus
  • Deltoid tuberosity of humerus (correct)
  • Head of the humerus
  • Medial epicondyle of humerus

Which nerve supplies the deltoid muscle?

  • Median nerve
  • Radial nerve
  • Musculocutaneous nerve
  • Axillary nerve (correct)

What is the action of the anterior deltoid?

  • Shoulder abduction
  • Shoulder adduction
  • Shoulder flexion and internal rotation (correct)
  • Shoulder extension

Which artery is responsible for supplying blood to the deltoid muscle?

<p>All of the above (D)</p> Signup and view all the answers

What is the action of the medial deltoid?

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

What is the primary function of the supraspinatus muscle?

<p>Initiation of abduction (A)</p> Signup and view all the answers

Which muscle is responsible for pure abduction of the shoulder?

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

What is the distal attachment point of the supraspinatus muscle?

<p>Superior facet of greater tubercle of Humerus (B)</p> Signup and view all the answers

Which nerve supplies the teres minor muscle?

<p>Axillary Nerve (C)</p> Signup and view all the answers

What is the proximal attachment point of the infraspinatus muscle?

<p>Infraspinous fossa of Scapula (B)</p> Signup and view all the answers

Which muscle is responsible for external rotation and shoulder extension?

<p>Posterior deltoid (C)</p> Signup and view all the answers

What is the blood supply of the infraspinatus muscle?

<p>Circumflex Scapular Artery (D)</p> Signup and view all the answers

Study Notes

Deltoid Muscle

  • Proximal attachments include the lateral 1/3 of the clavicle, acromium, and spine of scapula

Attachments

  • Distal attachment is at the deltoid tuberosity of the humerus

Blood Supply

  • Supplied by the posterior circumflex humeral artery
  • Also receives blood from the deltoid branch of the thoracoacromial artery

Nerve Supply

  • Innervated by the axillary nerve

Actions

  • Anterior fibers perform shoulder flexion and internal rotation
  • Medial fibers perform pure abduction
  • Posterior fibers perform shoulder extension and external rotation

Deltoid Muscle

  • Proximal attachment: Lateral 1/3 clavicle, Acromium, and Spine of Scapula
  • Distal attachment: Deltoid tuberosity of Humerus
  • Blood supply: Posterior Circumflex Humeral Artery and Deltoid branch of Thoracoacromial Artery
  • Nerve supply: Axillary Nerve
  • Actions: Anteriorly - Shoulder Flexion/Internal Rotation, Medially - Pure ABDuction, Posteriorly - Shoulder extension/External Rotation

Supraspinatus Muscle

  • Proximal attachment: Supraspinous fossa of Scapula
  • Distal attachment: Superior facet of greater tubercle of Humerus
  • Blood supply: Circumflex Scapular Artery
  • Nerve supply: Suprascapular Nerve
  • Actions: Assists Deltoid in initial 20° of abduction, "Initiator of Abduction", and External Rotation

Infraspinatus Muscle

  • Proximal attachment: Infraspinous fossa of Scapula
  • Distal attachment: Middle facet of greater tubercle of Humerus
  • Blood supply: Circumflex Scapular Artery
  • Nerve supply: Suprascapular Nerve
  • Action: External Rotation

Teres Minor Muscle

  • Proximal attachment: Middle part of lateral border of Scapula
  • Distal attachment: Inferior facet of greater tubercle of Humerus
  • Blood supply: Subscapular/Circumflex Scapular Artery
  • Nerve supply: Axillary Nerve
  • Action: External Rotation

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Quiz about the deltoid muscle, covering its attachments, blood supply, nerve supply, and actions.

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