Shoulder Muscles.txt

  1. Deltoid: Attachments
    • Lateral 1/3 of clavicle
    • Acromion
    • Spine of scapula

    Deltoid tuberosity of humerus
  2. Deltoid: Innervation & Bloody Supply
    Axillary N. (C5, C6)

    • Posterior Circumflex Humeral A.
    • Deltoid branch of Thoracoacromial A.
  3. Deltoid: Actions
    • Clavicular - Flexes / Medial Rotation
    • Middle - Abducts
    • Spinal - Extends / Laterally Rotation
  4. Supraspinatus: Attachments
    Supraspinous fossa of scapula

    Greater tubercle of humerus
  5. Supraspinatus: Innervation & Blood Supply
    Suprascapular N. (C5, C6)

    Suprascapular A.
  6. Supraspinatus: Actions
    Initiates abduction of upper limb (15 degrees)

    Holds head of humerus in the glenoid cavity during arm elevation (flexion, abduction)
  7. Infraspinatus: Attachments
    Infraspinous fossa of scapula

    Middle facet on greater tubercle of humerus
  8. Infraspinatus: Innervation & Blood Supply
    Suprascapular N. (C5, C6)

    • Suprascapular A.
    • Scapular Circumflex A.
  9. Infraspinatus: Actions
    Laterally rotates humerus

    Holds head of humerus in glenoid fossa during arm movements
  10. Teres Minor: Attachments
    Middle (superior) part of lateral border of scapula

    Inferior facet on greater tubercle of humerus
  11. Teres Minor: Innervation & Blood Supply
    Axillary N. (C5, C6)

    Circumflex Scapular A.
  12. Teres Minor: Actions
    Laterally rotates humerus

    (Weak adductor of humerus)
  13. Subscapularis: Attachments
    Subscapular fossa

    Lesser tubercle of humerus
  14. Subscapularis: Innervation & Blood Supply
    Upper and lower Subscapular Nerves (C5, C6, C7)

    • Subscapular A.
    • (Lateral Thoracic A.)
  15. Subscapularis: Actions
    Medially rotates humerus

    (weak adductor)
  16. Teres Major: Attachments
    Posterior surface of inferior angle of scapula

    Medial lip of intertubercular groove of humerus
  17. Teres Major: Innervation & Blood Supply
    Lower Subscapular N. (C5, C6, C7)

    Circumflex Scapular A.
  18. Teres Major: Actions
    Adducts / Medially Rotates Humerus

    (Extends arm)
Card Set
Shoulder Muscles.txt
Exam 1