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SHOULDER ANATOMY

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SHOULDER ANATOMY. BONY ANATOMY. Humerus • proximal end articulates with scapula to from shoulder • distal end articulates with bones of the forearm to form elbow. Scapula • the shoulder blade Glenoid fossa has ring of cartilage called labrum to deepen the articular surface

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Presentation Transcript
slide3

Humerus

•proximal end articulates with scapula to from shoulder

• distal end articulates with bones of the forearm to form elbow

slide4

Scapula

• the shoulder blade

Glenoid fossa has ring of cartilage called labrum to deepen the articular surface

• the glenoid fossa of the scapula articulates with the humerus to form the glenohumeral joint (shoulder)

• the acromion process articulates with the clavicle to from the acromioclavicular joint (tip of the shoulder)

slide5

Clavicle

• distally articulates with the acromion process to form the AC joint

• Proximally articulates with the sternum to form SC joint

review of joints
Review of Joints
  • Glenoid fossa+humerus=glenohumeral joint (GH) (scapula)
  • Acromion process + clavicle =acromioclavicular (scapula) (AC)
  • Sternum + clavicle=sternoclavicular (SC)
  • Scapula+rib cage= scapulothoracic articulation
slide8

Trapezius

• large, triangular muscle

• starts at base of skull, runs out to tip of shoulder and down to the 12th thoracic vertebrae

• functions to shrug and square the shoulders

slide9

Rhomboids

• group of two muscles that run diagonally from the spine to the medial border of the scapula

• they function to retract the scapula

slide10

Latissimus Dorsi

• the “lats”

• gives wing like appearance to sides

• starts along the thoracic vertebrae of back and inserts on the anterior aspect of humerus

• functions extend , adduct and medially rotate the arm

slide11

Pectoralis Major

• the chest muscle

• originates along the sternum and clavicle, inserts on the humerus

• it functions to:

~ adduct

~ flex

~medially rotate

the arm.

slide12

Deltoid

• the muslce that gives contour to the shoulder

• originates along the spine of the scapula and clavicle, inserts on the humerus

• all fibers abduct the arm

• anterior fibers: flex and medially rotate arm

• posterior fibers: extend and laterally rotate arm

slide13

Biceps

• the “popeye” muscle

• on anterior aspect of arm

• crosses both the shoulder and elbow

• flexes the arm

slide14

Triceps

• on the posterior aspect of the arm

• crosses both the shoulder and elbow

• extends the arm

rotator cuff
Rotator Cuff
  • Group of four muscles that act to hold the head of the humerus into the glenoid fossa
    • Supraspinatus
    • Infraspinatus
    • Teres Minor
    • Subscapularis
rotator cuff cont
Rotator Cuff cont.
  • Supraspinatus: 1st 10 degrees of abduction
  • Infraspinatus: external rotation
  • Teres minor: external rotation
  • Subscapularis: internal rotation
slide17

** Note that there are no muscles on the inferior aspect of the shoulder!! This will be important when we talk about shoulder injuries

labrum
Labrum
  • Ring of cartilage similar to the menisci of the knee.
  • Deepens the articular surface of the genoid fossa and adds to the stability of the shoulder
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