Tag: pectoralis major muscle

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Chapter 1 - Thorax Grant's Atlas of Anatomy, 12th Edition Nursing

1.2 Superficial dissection, male pectoral region

  • The platysma muscle, which descends to the 2nd or 3rd rib, is cut short on the right side of the specimen; together with the supraclavicular nerves, it is reflected on the left side.
  • The thin pectoral fascia covers the pectoralis major.
  • The clavicle lies deep to the subcutaneous tissue and the platysma muscle.
  • The cephalic vein passes deeply in the clavipectoral (deltopectoral) triangle to join the axillary vein.
  • Supraclavicular (C3 and C4) and upper thoracic nerves (T2 to T6) supply cutaneous innervation to the pectoral region.
  • The clavipectoral (deltopectoral) triangle, bounded by the clavicle superiorly, the deltoid muscle laterally, and the clavicular head of the pectoralis major muscle medially, underlies a surface depression called the infraclavicular fossa.
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Chapter 1 - Thorax Grant's Atlas of Anatomy, 12th Edition Nursing

1.1 Surface anatomy of male pectoral region

  • The subject is adducting the shoulders against resistance to demonstrate the pectoralis major muscle.
  • The pectoralis major muscle has two parts, the sternocostal and clavicular heads.
  • The anterior axillary fold is formed by the inferior border of the sternocostal head of the pectoralis major muscle.
  • The axillary fossa (“armpit”) is a surface feature overlying a fat-filled space, the axilla.