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Diaphragm

Origin: Vertebral bodies of L1, 2 (left), L1-3 (right). Medial and lateral arcuate ligs, inner aspect of lower six ribs . Posterior aspect of xiphoid

Insertion: Central tendon

Actions:  Assists in raising intra-abdominal pressure and inspiration.

Innervation:  C3-5 Phrenic nerve (ventral rami)

Daily uses: Breathing

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Other muscles …

Infraspinatus

Origin: Posterior surface of the scapula (below the spine of the scapula)
.

Insertion: Greater tuberosity on the humerus
.

Actions: Shoulder abduction, 
External rotation.

Innervation: Suprascapular nerve
.

Daily uses: Brushing hair.

Teres Minor

Origin: Mid section of the lateral border of the scapula

Insertion: Greater tuberosity on the humerus

Actions:External rotation, 
Shoulder adduction

Innervation: Axillary nerve

Daily uses: Brushing hair

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tuberosity of the humerus

Actions: Abduction 
Stabilisation of the humerus

Innervation: Suprascapular nerve

Daily uses: Holding shopping bags away from the body

More Anatomy

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Ligaments

Check out strengthening exercises for the rotator cuff