anterior pectoral girdle

• serratus anterior:

  o - via fleshy digitations to the outer surfaces of the upper 8/9 ribs and the intercostal fascia

  r - backwards

  i - costal surface of the medial border of the scapula

  a - protraction & lateral rotation of scapula

  ns - long thoracic nerve c5-7

  
  

  Function:

  • Movements which drive the scapula forwards e.g. pushing, punching

  • Major stabiliser of scapula during upper limb movements, holding medial border against the thoracic wall
• pectoralis minor: Thin, flat triangular muscle, lying deep to pectoralis major

  o - outer borders of costal cartilage of ribs 3-5 and intervening intercostal fascia

  r - superolateral from inferior attachments to the upper attachments

  i - upper surface and medial border of the coracoid process via a short, flat tendon

  a - medial rotation and depression of scapula

  ns - medial pectoral nerve c8, t1

  
  

  Function:

  • Pulls scapula downwards and forwards during pushing and punching movements

  • Accessory muscle of inspiration
• subclavius: small triangular muscle, lying between the clavicle and the first rib

  o - from a short, thick tendon from the first rib and its cartilage, in front of the costoclavicular ligament

  r - obliquely upward and laterally

  i - subclavian groove on the under surface of the clavicle

  a - depression of clavicle

  ns - nerve to subclavius c(4), 5 , 6

  
  

  function:

  Keeps the clavicle stabilised during scapular movements