- Medial Head: Medial condyle of femur and area just superior to the condyle.
- Lateral head: lateral condyle of femur and are superior to the condyle.
Insertion: Posterior calcaneus via calcaneal tendon.
Actions: Flexes the leg at the knee; Plantar flexes the foot.
Innervation: Tibial nerve S1, S2.
Daily uses: Standing on tip toes.
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.
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
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
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