Brachial Plexus Anatomy Quiz
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Brachial Plexus Anatomy Quiz

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Questions and Answers

Which nerve is the largest branch of the medial cord?

  • Medial pectoral nerve
  • Medial cutaneous nerve of the arm
  • Lateral pectoral nerve
  • Ulnar nerve (correct)

    • Which nerve supplies both pectoralis major and pectoralis minor?

  • Musculocutaneous nerve
  • Ulnar nerve
  • Medial pectoral nerve (correct)
  • Lateral pectoral nerve

    • What is the course of the axillary nerve?

  • Runs directly beneath the medial cutaneous nerve of the forearm
  • Passes downwards and laterally on the subscapularis muscle (correct)
  • Descends along the lateral border of the pectoralis major
  • Passes medially to the humeral shaft

    • Which nerve is specifically responsible for supplying skin on the medial side of the forearm?

    <p>Medial cutaneous nerve of the forearm</p> Signup and view all the answers

    Which of the following nerves is a terminal branch of the posterior cord?

    <p>Radial nerve</p> Signup and view all the answers

    Which nerve arises from the lateral cord of the brachial plexus?

    <p>Musculocutaneous nerve</p> Signup and view all the answers

    What is the origin of the axillary nerve?

    <p>Posterior cord</p> Signup and view all the answers

    Which nerve descends medial to the third part of the axillary artery?

    <p>Medial cutaneous nerve of the forearm</p> Signup and view all the answers

    Which of the following statements is true about the lateral pectoral nerve?

    <p>It pierces the clavi-pectoral fascia.</p> Signup and view all the answers

    Which joint does the radial nerve primarily innervate?

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

    What is the primary region the suprascapular nerve supplies after passing through the supra-scapular foramen?

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

    Which joint receives articular branches from the suprascapular nerve?

    <p>Shoulder joint</p> Signup and view all the answers

    How does the suprascapular nerve reach the infraspinous fossa?

    <p>Descending through the spino-glenoid notch</p> Signup and view all the answers

    Which nerve is considered the largest branch of the lateral cord in the brachial plexus?

    <p>Musculocutaneous nerve</p> Signup and view all the answers

    What is the role of the nerve to subclavius?

    <p>To innervate the subclavius muscle</p> Signup and view all the answers

    Which nerve is not a branch of the brachial plexus?

    <p>Great auricular nerve</p> Signup and view all the answers

    What is the function of the dorsal scapular nerve?

    <p>To innervate the scapular area</p> Signup and view all the answers

    What is the main characteristic of the scapular foramen's anatomical structure?

    <p>Present underneath the suprascapular ligament</p> Signup and view all the answers

    Which of the following pairs includes muscles supplied by branches of the brachial plexus?

    <p>Subscapularis and biceps brachii</p> Signup and view all the answers

    The thoracodorsal nerve primarily innervates which muscle?

    <p>Latissimus dorsi</p> Signup and view all the answers

    Which of the following statements accurately describes the roots of the brachial plexus?

    <p>Roots consist of the ventral primary rami of C5, C6, C7, C8, and T1.</p> Signup and view all the answers

    What is the correct order of formation in the brachial plexus?

    <p>Roots, Trunks, Divisions, Cords</p> Signup and view all the answers

    Which branch of the brachial plexus is responsible for supplying the serratus anterior muscle?

    <p>Long thoracic Nerve</p> Signup and view all the answers

    Which part of the brachial plexus lies behind the clavicle?

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

    From which trunk does the nerve to subclavius arise?

    <p>Upper trunk</p> Signup and view all the answers

    What is the function of the branches from the medial and lateral cords of the brachial plexus?

    <p>They supply the flexor side of the upper limb.</p> Signup and view all the answers

    Which of the following describes the location of the Cords of the brachial plexus?

    <p>They lie in the axilla.</p> Signup and view all the answers

    The dorsal scapular nerve arises from which root of the brachial plexus?

    <p>C5</p> Signup and view all the answers

    Which of the following nerves does NOT arise from the upper trunk?

    <p>Long thoracic Nerve</p> Signup and view all the answers

    Study Notes

    Brachial Plexus

    • The brachial plexus is a network of nerves that supplies the upper limb.
    • It is composed of five roots, three trunks, six divisions, three cords, and numerous branches.

    Formation and Location

    • Roots: Formed by the ventral rami of C5, C6, C7, C8, and T1.
    • Trunks:
      • Upper trunk: C5 and C6 roots unite.
      • Middle trunk: C7 root alone.
      • Lower trunk: C8 and T1 roots unite.
    • Divisions:
      • Each trunk divides into anterior and posterior divisions.
      • Anterior divisions form the lateral and medial cords.
      • Posterior divisions form the posterior cord.
    • Cords:
      • Medial cord: Formed from the anterior division of the lower trunk.
      • Lateral cord: Formed by the union of anterior divisions of the upper and middle trunks.
      • Posterior cord: Formed by the union of the posterior divisions of the three trunks.

    Branches of the Brachial Plexus

    • Roots:

      • Nerve to Rhomboids (Dorsal Scapular Nerve): Arises from C5 root.
      • Nerve to Serratus Anterior (Long Thoracic Nerve): Arises from C5, C6, and C7 roots.

    • Trunks:

      • Nerve to Subclavius: Arises from upper trunk (C5 and C6 roots).
      • Suprascapular Nerve: Arises from upper trunk (C5 and C6 roots).

    • Lateral Cord:

      • Musculocutaneous Nerve: Largest branch, C5, C6, and C7 roots.
      • Lateral Pectoral Nerve: Pierces clavipectoral fascia and supplies pectoralis major muscle, C5, C6, and C7 roots.

    • Medial Cord:

      • Ulnar Nerve: Largest branch, C7, C8, and T1 roots.
      • Medial Root of Median Nerve: C8 and T1 roots.
      • Medial Pectoral Nerve: Supplies pectoralis minor and major muscles, C8 and T1 roots.
      • Medial Cutaneous Nerve of the Arm: Supplies skin on medial side of the lower arm, C8 and T1 roots.
      • Medial Cutaneous Nerve of the Forearm: Supplies skin of the medial side of the forearm to the wrist, C8 and T1 roots.

    • Posterior Cord:

      • Radial Nerve: Larger of the two terminal branches of the posterior cord, C5, C6, C7, C8, and T1 roots.
      • Axillary (Circumflex) Nerve: Smaller terminal branch of the posterior cord, C5 and C6 roots.

    Axillary Nerve

    • Axillary nerve supplies the deltoid and teres minor muscles.

    Suprascapular Nerve

    • Suprascapular Nerve runs through the suprascapular notch and supplies the supraspinatus and infraspinatus muscles.

    • Note: Branches of both the medial and lateral cords supply the flexor side of the upper limb, while branches of the posterior cord supply the extensor side of the upper limb.

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    Brachial Plexus PDF

    Description

    Test your knowledge on the anatomy of the brachial plexus, including its formation, location, and branches. Understand the roles of the roots, trunks, divisions, and cords in supplying the upper limb. Perfect for students studying human anatomy or preparing for medical exams.

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