INTRODUCTION OF BACK MUSCLE
Back muscle anatomy are
1) TRAPEZIUS
Origin : Spinous process C7 , T1-T12 , occipital bone.
Insertion : Clavicle ( lateral 1/3 ) , Acromions process and spine of scapula.
Action :
– Elevates and retracts the scapula
– Stabilizes the scapula .
Nerve supply :
– Accessory nerve
– C3 , C4 branches.
2) LATISSIMUS DORSI
Origin :
– Spines of T7 to T12 .
– Posterior third of scapula.
Insertion : Floor of tubercular groove.
Action : Extends and medial rotation of arm.
Nerve supply : Thoracodorsal nerve (C6- C8).
3) LEVATOR SCAPULAE
Origin : C1 – C4 transverse process
Insertion : Medial border of scapula from superior angle of the spine.
Action : Dorsal scapular nerve.
Nerve supply : scapula elevation .
4) RHOMBOID MINOR
Origin : C7 to T1 spinous process.
Insertion : Spine of scapula
Action : scapula retraction.
Nerve supply : Dorsal scapular nerve.
5) RHOMBOID MAJOR
Origin : T2-T5 spinous process.
Insertion : medial border of scapula.
Action : scapula retraction.
Nerve supply :Dorsal scapular nerve.
6) SUPRASPINATUS
Origin : Supraspinous fossa of scapula ( medial two – third ) .
Insertion : Greater tubercle of humerus ( upper impression ).
Action : Shoulder abduction.
Nerve supply : Suprascapular nerve.
7) INFRASPINATUS
Origin : Infraspinatus fossa of scapula ( medial two – third ).
Insertion : Greater tubercle of humerus ( middle impression )
Action : Arm lateral rotation.
Nerve supply : Suprascapular nerve.
end of back muscle anatomy…..
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