Radial Nerve Branches Anatomy
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Questions and Answers

Which nerve is the terminal branch of the lateral cord of the brachial plexus?

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

    • What is the main function of the triceps brachii muscle?

  • Abduction of the arm
  • Extension of the forearm (correct)
  • Adduction of the arm
  • Flexion of the forearm

    • Which of the following is a branch of the musculocutaneous nerve?

  • Lateral cutaneous nerve of forearm (correct)
  • Lateral cutaneous nerve of arm
  • Medial cutaneous nerve of forearm
  • Radial nerve

    • What is the location of the radial nerve in the arm?

    <p>Posterior to the axillary artery</p> Signup and view all the answers

    Which structure does the radial nerve exit the axilla via?

    <p>Triangular interval</p> Signup and view all the answers

    What is the blood supply of the triceps brachii muscle?

    <p>Profunda brachii artery</p> Signup and view all the answers

    Which of the following is a boundary of the cubital fossa?

    <p>Lateral epicondyle of humerus</p> Signup and view all the answers

    What is the innervation of the anconeus muscle?

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

    What is the function of the anconeus muscle?

    <p>Assist triceps in extending the forearm</p> Signup and view all the answers

    Which of the following nerves supplies the muscles in the anterior compartment of the arm?

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

    Which of the following nerves innervate the Brachialis muscle?

    <p>Both the musculocutaneous and radial nerves</p> Signup and view all the answers

    The brachial fascia extends to which of the following structures?

    <p>Both the forearm and arm</p> Signup and view all the answers

    What is the function of the bicipital aponeurosis?

    <p>Reinforces the wall of the cubital fossa</p> Signup and view all the answers

    The cubital fossa is bounded by which of the following structures?

    <p>Both the medial and lateral epicondyles</p> Signup and view all the answers

    Which of the following arteries supplies the arm?

    <p>Only the brachial artery</p> Signup and view all the answers

    Which of the following nerves is NOT a branch of the radial nerve?

    <p>Median nerve</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 musculocutaneous nerve innervates which of the following muscles?

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

    The lateral intermuscular septum extends from the deep surface of the brachial fascia to which of the following structures?

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

    Which of the following muscles is NOT a flexor of the forearm?

    <p>Triceps brachii</p> Signup and view all the answers

    Which branch of the radial nerve innervates the extensor carpi radialis longus?

    <p>Muscular branch in the arm</p> Signup and view all the answers

    What is the function of the bicipital aponeurosis?

    <p>To protect the brachial artery and median nerve</p> Signup and view all the answers

    Which nerve is responsible for detecting noxious stimuli in the dorsal hand and fingers?

    <p>Superficial branch of the radial nerve</p> Signup and view all the answers

    What is the boundary of the cubital fossa medially?

    <p>Lateral border of the pronator teres muscle</p> Signup and view all the answers

    Which artery is the continuation of the axillary artery?

    <p>Brachial artery</p> Signup and view all the answers

    Which nerve innervates the muscles of the flexor compartment of the arm?

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

    What is the superficial branch of the radial nerve responsible for?

    <p>Contributing to the cutaneous innervation of the dorsal hand and fingers</p> Signup and view all the answers

    What is the clinical significance of the median cubital vein?

    <p>It is the vein of choice for venepuncture and intravenous injections</p> Signup and view all the answers

    What is the function of the brachial fascia?

    <p>To separate the superficial and deep structures of the arm</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the extensor muscles of the forearm?

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

    Study Notes

    Anatomy of the Arm

    • The arm is divided into two compartments: anterior (flexor) and posterior (extensor)
    • Each compartment has its own muscles, nerves, and blood supply

    Musculocutaneous Nerve

    • Terminal branch of the lateral cord of the brachial plexus
    • Pierces the coracobrachialis muscle
    • Supplies all the muscles in the anterior compartment of the arm
    • Pierces the deep fascia to become cutaneous (superficial)
    • Branches:
      • Muscular branches
      • Lateral cutaneous nerve of the forearm

    Radial Nerve

    • Terminal continuation of the posterior cord of the brachial plexus
    • Lies posterior to the axillary artery
    • Exits the axilla via the triangular interval
    • Lies in the radial groove, accompanied by the profunda brachii artery
    • Supplies the triceps and anconeus muscles

    Cubital Fossa

    • Triangular region with an apex pointing distally
    • Gateway/transition point between the arm and forearm
    • Boundaries:
      • Medial: lateral border of the pronator teres
      • Lateral: medial border of the brachioradialis
      • Base: imaginary line between the medial and lateral epicondyles of the humerus
      • Floor: brachialis and supinator
      • Roof: skin, superficial and deep fasciae, reinforced by the bicipital aponeurosis
    • Contents:
      • Superficial:
        • Median cubital vein
        • Upper lateral cutaneous nerve of the forearm
        • Medial cutaneous nerve of the forearm
      • Deep:
        • Median nerve
        • Brachial artery
        • Biceps brachii tendon
        • Radial nerve (deep to the brachioradialis)

    Posterior (Extensor) Compartment

    • Extensors of the forearm
    • Two muscles:
      • Triceps brachii
      • Anconeus
    • Blood supply: profunda brachii
    • Innervation: radial nerve

    Triceps Brachii

    • Origin:
      • Long head: infraglenoid tubercle of the scapula
      • Lateral head: posterior shaft of the humerus
      • Medial head: posterior shaft of the humerus
    • Insertion: common tendon at the olecranon process of the ulna
    • Function:
      • Main/chief extensor of the forearm
      • Assists in adduction of the arm
      • Stabilizes the head of the abducted humerus in the glenohumeral joint (long head)

    Anconeus

    • Origin: lateral epicondyle of the humerus
    • Insertion: fibers diverge medially to attach on the lateral aspect of the olecranon process
    • Function:
      • Assists the triceps in extending the forearm at the elbow joint
      • Stabilizes the elbow joint

    Clinical Anatomy

    • Radial nerve palsy:
      • Causes: fracture of the midshaft of the humerus, incorrect intramuscular injection, Saturday night palsy
      • Results: loss of function in the extensors of the forearm, hand, metacarpals, and phalanges
      • Wrist drop, weakness of adduction and abduction of the hand
    • Brachial artery:
      • Pulsation: auscultation for manual recording of blood pressure is carried out in front of the elbow
      • Clinical anatomy: pulsation is taken in the cubital fossa, which is a gateway between the arm and forearm

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    Related Documents

    UL Anatomy of the Arm and Cubital Fossa PDF

    Description

    This quiz covers the branches of the radial nerve, including its deep and superficial branches, and their functions in the forearm and hand.

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