SEM2: Thorax I

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1. what do the subclavian muscle and clavipectoral fascia protect

  • brachial plexus and subclavian vessels from a broken clavicle
  • the diaphragm from a broken xiphoid process
  • the lungs from a broken rib
  • the trachea from a broken manubrium
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2. what are the typical and atypical ribs?

  • atypical = 1,2, 10,11,12 typical: 3-9
  • atypical = 1,3, 10,11,12 typical: 2,4-9
  • atypical = 1, 10,11,12 typical: 2-9
  • atypical = 1,2, typical: 3-12

3. what are lobules

  • sebaceous glands that enlarge
  • buds that appear like spikes on a bike wheel
  • suspensory ligaments attaching mammary glands to dermis of skin
  • exocrine modified sweat glands that produce milk
  • conical/cyclindrical prominences

4. what structures run through the superior thoracic aperture

  • oesophagus, trachea, subclavian artery and vein, internal carotid artery, external jugular vein
  • oesophagus, trachea, internal carotid artery, external jugular vein
  • oesophagus, trachea, common carotid artery, internal jugular vein
  • oesophagus, trachea, subclavian artery and vein, common carotid artery, internal jugular vein
  • oesophagus, trachea, subclavian artery and vein, common carotid artery, external jugular vein

5. what is the action of the pectorals major

  • depresses scapular, accessory respiration
  • adducts and medially rotates humerus; extends and flexes arm
  • protraction and rotation of scapular
  • abducts arm, flexion and extension
  • pulling down the mandible (opening the mouth) and pulling the corners or the mouth (frowning)
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