Intrinsic Muscles of FL

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Muscle, origin, insertion, function, innervation

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4 Terms

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Supraspinatus

Origin- Supraspinatus fossa and spine of the scapula

Insertion- Greater tubercle of the humerus

Function- Extends and fixes the shoulder

Innervation- Suprascapular n.

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Infraspinatus

Origin- Infraspinous fossa and spine of the scapula Infraspinatus m.

Insertion- surface of the humerus

Function- Flexes and abducts the shoulder

Innervation- Suprascapular n.

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Subscapularis

Origin- Subscapular fossa

Insertion- Lesser tubercle of the humerus

Function- Adducts the shoulder

Innervation- Subscapular (main part) and axillary n. caudal part

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Deltoideus

Origin- Spine and acromion of the scapula

Insertion- Deltoid tuberosity

Function- Flexes the shoulder

Innervation- Axillary n.