Semi membranosus

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SemimembranosusSemimembranosus: Origin and Insertion 

Semi membranosus

Origin: Ischial tuberosity of os coxae

Insertion: Posterior medial condyle of tibia

Actions: Knee flexion. Extends thigh at hip.

Innervation: Tibial portion of the sciatic nerve (L5, S1,S2)

Daily uses: Running

 

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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

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