Scapular Region
description
Transcript of Scapular Region
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Scapular Region
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Objectives
Know the principal muscles of the scapular and scapulo-humeral regions.
Understand the mechanism of scapular rotation in relation with shoulder movements.
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Surface Anatomy
• Spine
Acromion (of scapula
Teres minormuscle Teres major
muscle
Infraspinatusmuscle
Triangle ofascultation
Trapezius muscle
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AnteriorScapula.-angles, borders-glenoid cavity, -acromion, -coracoid process, -Subscapular fossa
Humerus.-Head,-Surgical neck-Anatomical neck-Greater tubercle-Lesser tubercle-Intertubercular (bicipital) groove
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PosteriorClavicle.Acromioclavicular joint
Scapula.- Spine - Acromion- Supraspinous fossa- Infraspinous fossa
Humerus. - Head - Anatomical neck, - Surgical neck, - Deltoid tuberosity- Spiral (radial) groove.
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Superior rotation of Glenoid fossa:
- Powerful muscles pull on bony struts.
Scapula rotates when we move our arms to allow more range of motion at the shoulder joint
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Complete abduction at the shoulder joint requires superior rotation of the scapula so that the glenoid fossa faces superiorly.
Glenoid fossa
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Deltoid
• Clavicular origin, acromial, and scapular origins, attach all to deltoid tuberosity
• Anterior fibers flexes• Posterior fibers extends and
laterally rotates• Middle fibers abducts the arm• Innervation C5,6 Axillary nerve
Delta= TriangleDeltoid=triangular in shape Principal abductors= Deltoid, supraspinatus
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Subdeltoid / Subacromial bursa.
Bursa: a closed sac or envelope, lined with synovium and containing fluid, usually in areas subject to friction.
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Rotator cuff muscles stabilize the shoulder joint.Supraspinatus, Infraspinatus,Subscapularis, Teres minor
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Rotator Cuff MusclesBecause the scapula is triangular deep bone, paddedwith thick muscles, injuries leading to scapular fractures Will be so severe , and most commonly we will have lots of multiple, or serious other fractures
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Transverse scapular ligament
• Runs between Subscapular nerve (C5,6) and artery, which supply Supraspinatus and Infraspinatus muscles
• Artery above, nerve below
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Serratus Anterior
Winged Scapula: (long thoracic nerve)
Subscapularis
"big swing muscle" or "boxer's muscle”Antagonist of RhomboidsAccessory muscle of respiration
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Posterior view:- Trapezius- Latissimus Dorsi- Deltoid
Rhomboids:- minor and major- retract / inferior rotate scapula
Teres major:- inserts near latissimus dorsi- adduct / medially rotate arm
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Rhomboids retract, so injury to the dorsal scapular nerve will make the
scapula further away from the midline on the affected side
Posterior scapula
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Thank you