Shoulder Girdle MOINA

• origin and insertion of pectoralis major

  origin: medial third of clavicle (clavicular), upper 6 costal cartilages (sternal)

  insertion: lateral lip of bicipital groove of humerus
• innervation of pectoralis major

  medial and lateral pectoral nerves
• action of pectoralis major

  adducts and rotates arm medially, flexes arm (clavicular)
• origin and insertion of pectoralis minor

  origin: 3rd, 4th, and 5th ribs

  insertion: coracoid process
• innervation of pectoralis minor

  medial pectoral nerve
• action of pectoralis minor


  • depresses point of shoulder
  • if scapula is fixed, elevates the ribs of origin
• origin and insertion of subclavius

  origin: 1st costal cartilage

  insertion: clavicle
• innervation of subclavius

  nerve to subclavius
• action of subclavius

  • depresses clavicle
  • stabilizes clavicle during shoulder girdle movements
• origin and insertion of serratus anterior

  origin: upper 8 ribs

  insertion: anterior surface of vertebral border of scapula
• innervation of serratus anterior

  long thoracic nerve
• action of serratus anterior

  upwardly rotates scapula and draws forward anterior around thoracic wall
• origin of trapezius

  • occipital bone
  • ligamentum nuchae
  • spines of CV7, TV1-12
• insertion of trapezius

  lateral third of clavicle (upper), acromion and spine of scapula (middle and lower)
• innervation of trapezius

  motor: spinal part of accessory nerve CN11

  sensory: C3 and C4
• action of trapezius

  elevate scapula (upper), pull scapula medially (middle), pull medial border of scapula downward (lower)
• origin of latissimus dorsi

  • Iliac crest
  • Lumbodorsal fascia
  • Spines of TV7-12
  • Lower 3 or 4 ribs
  • Inferior angle of scapula
• insertion of latissimus dorsi

  floor of bicipital groove of humerus
• innervation of latissimus dorsi

  thoracodorsal nerve
• action of latissimus dorsi

  extends, adducts, and medially rotates the arm
• origin and insertion of levator scapulae

  origin: transverse processes of first 4 cervical vertebrae CV1-4

  insertion: medial border of scapula
• innervation of levator scapulae

  C3, C4, dorsal scapular nerve
• action of levator scapulae

  raises medial border of scapula
• origin and insertion of rhomboid minor

  origin: ligamentum nuchae & spines of CV7 and TV1

  insertion: medial border of scapula
• innervation of rhomboid minor

  dorsal scapular nerve
• action of rhomboid minor

  raises medial border of scapula upward and medially
• origin and insertion of rhomboid major

  origin: 2nd to 5th thoracic spines

  insertion: medial border of scapula
• innervation of rhomboid major

  dorsal scapular nerve
• action of rhomboid major

  raises medial border of scapula upward and medially
• origin and insertion of deltoid

  origin: lateral third of clavicle (anterior), acromion (middle), spine of scapula (posterior)

  insertion: deltoid tuberosity
• innervation of deltoid

  axillary nerve
• action of deltoid

  flexes and medially rotates shoulder (anterior), major shoulder abductor (middle), extends and laterally rotates shoulder (posterior)
• origin and insertion of supraspinatus

  origin: supraspinous fossa

  insertion: greater tubercle of humerus and capsule of shoulder joint
• innervation of supraspinatus

  suprascapular nerve
• action of supraspinatus

  abducts shoulder & stabilizes shoulder joint
• origin and insertion of infraspinatus

  origin: infraspinous fossa

  insertion: greater tubercle of humerus and capsule of shoulder joint
• innervation of infraspinatus

  suprascapular nerve
• action of infraspinatus

  rotator cuff muscle, laterally rotates shoulder, and stabilizes shoulder joint
• origin and insertion of teres minor

  origin: upper 2/3 of lateral border of scapula

  insertion: greater tubercle of humerus and capsule of shoulder joint
• innervation of teres minor

  axillary nerve