Brachial Plexus Anatomy
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Questions and Answers

Which nerve innervates all intrinsic muscles of the hand, except for the three thenar muscles and the two lateral lumbrical muscles?

  • Sciatic nerve
  • Radial nerve
  • Median nerve
  • Ulnar nerve (correct)
  • Which nerve carries fibers from C7 and often has a communicating branch from the lateral root of the median nerve?

  • Radial nerve
  • Sciatic nerve
  • Ulnar nerve (correct)
  • Median nerve
  • Which nerve passes through the forearm and innervates the flexor carpi ulnaris muscle and the medial half of the flexor digitorum profundus muscle?

  • Median nerve
  • Ulnar nerve (correct)
  • Radial nerve
  • Sciatic nerve
  • Which nerve originates from the posterior cord of the brachial plexus and innervates muscles associated with the shoulder region or the posterior wall of the axilla?

    <p>Superior subscapular nerve</p> Signup and view all the answers

    Which division of the brachial plexus is divided into supraclavicular and infraclavicular parts by the clavicle?

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

    Which nerve passes into the arm and forearm, originating from the posterior cord of the brachial plexus?

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

    Where does the lateral pectoral nerve penetrate to innervate the pectoralis major muscle?

    <p>Clavipectoral fascia</p> Signup and view all the answers

    Which nerve innervates all three flexor muscles in the anterior compartment of the arm?

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

    What is the termination point of the musculocutaneous nerve?

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

    Which branch of the lateral cord joins a similar branch from the medial cord to form the median nerve?

    <p>Lateral root of the median nerve</p> Signup and view all the answers

    The infraclavicular branches are products of which type of nerve formation?

    <p>Peripheral nerves</p> Signup and view all the answers

    How is the brachial plexus divided based on its relation to the clavicle?

    <p>Infraclavicular and supraclavicular parts</p> Signup and view all the answers

    Which part of the brachial plexus contains contributions from C5 to C7?

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

    Where does the suprascapular nerve originate from?

    <p>Anterior divisions of the superior and middle trunks</p> Signup and view all the answers

    Which nerve innervates the rhomboid major and minor muscles?

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

    Where does the long thoracic nerve originate from?

    <p>Anterior rami of C5, C6, and C7</p> Signup and view all the answers

    Which part of the brachial plexus is positioned lateral to the axillary artery?

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

    Which part of the brachial plexus originates from all three posterior divisions?

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

    How many branches arise from the lateral cord of the brachial plexus?

    <p>3</p> Signup and view all the answers

    Which nerve originates entirely or partly from the lateral cord of the brachial plexus?

    <p>The lateral root of the median nerve</p> Signup and view all the answers

    Which part of the brachial plexus gives rise to nerves associated with posterior compartments of the arm and forearm?

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

    What divides each trunk of the brachial plexus into anterior and posterior divisions?

    <p>Cervico-axillary canal</p> Signup and view all the answers

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