SHOULDER ANATOMY
Download
1 / 18

SHOULDER ANATOMY - PowerPoint PPT Presentation


  • 175 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' SHOULDER ANATOMY' - jaclyn


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript


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

• 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)


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



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


Rhomboids

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

• they function to retract the scapula


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


Pectoralis Major

• the chest muscle

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

• it functions to:

~ adduct

~ flex

~medially rotate

the arm.


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


Biceps

• the “popeye” muscle

• on anterior aspect of arm

• crosses both the shoulder and elbow

• flexes the arm


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


** 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 the shoulder!! This will be important when we talk about shoulder injuries

  • 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


ad