Human Anatomy Week 10 - Axilla (Transcripts)
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Questions and Answers

What defines the medial wall of the axilla?

  • The anterior wall consisting of the pectoralis major
  • The skin of the armpit
  • The first to fourth ribs with the serratus anterior (correct)
  • The intertubercular groove of the humerus
  • What structure primarily forms the anterior wall of the axilla?

  • The clavicle
  • The teres major muscle
  • The pectoralis major muscle (correct)
  • The subscapularis muscle
  • Which statement accurately describes the shape and positioning of the axilla?

  • It is a pyramid-shaped space between the upper arm and the trunk. (correct)
  • It is a cylindrical space above the upper trunk.
  • It is a rectangular area beneath the first rib.
  • It is a spherical cavity located posterior to the scapula.
  • What forms the lateral wall of the axilla?

    <p>The intertubercular groove of the humerus</p> Signup and view all the answers

    Which rib marks the level at which the base of the axilla is located?

    <p>Fourth rib</p> Signup and view all the answers

    What is the role of fat in the axillary region?

    <p>It provides insulation and protection for neurovascular structures.</p> Signup and view all the answers

    Which structure serves as a boundary for the three parts of the axillary artery?

    <p>Pectoralis minor</p> Signup and view all the answers

    Which of the following correctly describes the progression of the axillary artery?

    <p>It starts at the outer border of the first rib and changes to the brachial artery at the border of teres major.</p> Signup and view all the answers

    What are the primary neurovascular structures present in the axillary region?

    <p>Axillary artery, axillary vein, and branches of the brachial plexus</p> Signup and view all the answers

    What marks the transition from the axillary artery to the brachial artery?

    <p>The lateral margin of teres major</p> Signup and view all the answers

    Which artery provides blood supply to the first intercostal space?

    <p>Supreme Thoracic Artery</p> Signup and view all the answers

    What are the names of the branches from the thoracoacromial trunk?

    <p>Acromial, Clavicular, Deltoid, Pectoral</p> Signup and view all the answers

    Which arteries come off the subclavian artery to supply the scapula?

    <p>Suprascapular and Transverse Cervical</p> Signup and view all the answers

    Which artery does the axillary artery become after passing the border of teres major?

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

    What is the primary function of the circumflex humeral arteries?

    <p>To encircle the humerus and provide collateral circulation</p> Signup and view all the answers

    What is the primary artery that runs down the medial arm between the biceps and triceps?

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

    Which artery branches off from the subclavian artery and provides blood supply to the scapula?

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

    What is the function of the profunda brachial artery in relation to the brachial artery?

    <p>It supplies blood to the humerus without crossing the elbow.</p> Signup and view all the answers

    Which superficial vein runs up the medial arm and ultimately joins the brachial vein?

    <p>Basilic vein</p> Signup and view all the answers

    In the axillary region, which area is known to contain numerous lymph nodes playing a crucial role in the immune system?

    <p>Pectoral lymph node area</p> Signup and view all the answers

    What is the primary reason for monitoring the axillary lymph nodes in breast cancer patients?

    <p>They often serve as a site for metastasis from breast cancer.</p> Signup and view all the answers

    What occurs to lymphatic drainage in the upper extremity if the axillary lymph nodes are removed during surgery?

    <p>It can be impaired, potentially leading to complications like lymphedema.</p> Signup and view all the answers

    Which sequence accurately describes the organization of the brachial plexus components?

    <p>Roots, trunks, divisions, cords, branches.</p> Signup and view all the answers

    What is the role of the posterior, lateral, and medial cords in the brachial plexus?

    <p>They are named based on their positions relative to the axillary artery.</p> Signup and view all the answers

    Which nerve roots predominantly contribute to the musculocutaneous nerve?

    <p>C5, 6, and 7.</p> Signup and view all the answers

    Which two nerves merge from the C4 and C5 roots before forming the dorsal scapular nerve?

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

    What is the primary function of the long thoracic nerve?

    <p>Innervates serratus anterior muscle</p> Signup and view all the answers

    Which of the following trunks does not have any nerves branching off before forming divisions?

    <p>Both B and C</p> Signup and view all the answers

    Which muscle is primarily innervated by the suprascapular nerve?

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

    What is a significant risk associated with the long thoracic nerve during surgical procedures?

    <p>It is prone to damage during shoulder surgeries due to its location.</p> Signup and view all the answers

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