Shoulder Anatomy

Shoulder Anatomy

1. Upper Trapezius

   • origin
     • external occipital protuberance
       • Med. 1/3 Sup. Nuchal Line
         • Nuchal Ligament
           • Spinous process C7
   • Insertion
     • Lat. 1/3 Clavicle
       • Med. Acromion proccess
   • Nerve INN.
     • Spinal Accessory Cranial XI
       • Ventral Rami C2-C4
   • Middle Trapezius
     • Origin
       • Spinous process T1-T5
     • Insertion
       • Med. edge of sup. Acromion process.
         • Sup. Edge of scapula spine
     • Lower Trapezius
       • Origin
         • Spinous process T6-T12
       • Insertion
         • Med.1/3 spine of scapula - tubercle
       • Action
         • Up Rot. Scap
           • Depress. Scap
     • Action
       • Retract. Scap
   • Action
     • Up. Rot. Scap
       • Elev. Scap

2. Rhomboids Minor

   • Rhomboids Major
     • Origin
       • Spin. Procc. T2 - T5
     • Insertion
       • Med. Border of Scap, Between Spine Scap + Infe. Angle
   • Origin
     • Spin. Procc. C7 - T1
   • Insertion
     • Upp. Med. border Scap. level spine of scap
   • Action (BOTH)
     • Adduct Scap.
       • Elevate Scap.
         • Downward Rot. Scap.
   • Nerve = Dorsal Scap. C4,5

3. ·

   • Serratus Anterior
     • Nerve = Long Thoracic C5,6,7,8
     • Origin
       • Ribs 1 - 8/9
     • Insertion
       • Anterior Surface of med. bord. Scap.
     • Actions
       • Abduct Scap.
         • Upward Rot. Scap
           • Depress Scap
             • Hold Med. Bord. Scap. to Rib Cage
   • Rotator Cuff
     • Supraspinatus
       • Origin
         • Supraspinous Fossa of Scap.
       • Insertion
         • Sup. Greater tubercle of Humerus
       • Action
         • Abduct Shoulder
           • Stabilize Head of humerus in Glenoid Cavity
       • Nerve
         • Suprascapular C4,5,6
     • Infraspinatus