Scapular Region. Objectives. Know the principal muscles of the scapular and scapulo-humeral regions . Understand the mechanism of scapular rotation in relation with shoulder movements. . Surface Anatomy. Spine. Acromion (of scapula. Trapezius muscle. Infraspinatus muscle. Triangle of
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Acromion (of scapula
- Supraspinous fossa
- Infraspinous fossa
- Anatomical neck,
- Surgical neck,
- Deltoid tuberosity
- Spiral (radial) groove.
Scapula rotates when we move
our arms to allow more range of motion at the shoulder joint
Complete abduction at the shoulder joint requires
superior rotation of the scapula so that the glenoid
fossa faces superiorly.
Deltoid=triangular in shape
Principal abductors= Deltoid, supraspinatus
Subdeltoid / Subacromial bursa.
Sub Acromial Bursa
Bursa: a closed sac or envelope, lined with synovium
and containing fluid, usually in areas subject to friction.
Rotator cuff muscles stabilize the shoulder joint.
Subscapularis, Teres minor
Because the scapula is triangular deep bone, padded
with thick muscles, injuries leading to scapular fractures
Will be so severe , and most commonly we will have lots of multiple, or serious other fractures
(long thoracic nerve)
"big swing muscle" or "boxer's muscleÔÇŁ
Antagonist of Rhomboids
Accessory muscle of respiration
- Latissimus Dorsi
- minor and major
- retract / inferior rotate
- inserts near latissimus dorsi
- adduct / medially rotate arm
Rhomboids retract, so injury to the dorsal scapular nerve will make the scapula further away from the midline on the affected side