Triceps Brachii

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Tricep brachii mm    Tricep: Origin and Insertion

Origin: Long head – Lower part of the glenoid cavity of the scapula
. Lateral head – Upper half of the posterior surface of the humerus
. Medial head – Lower 2/3 of the posterior surface of the humerus

Insertion: Olecranon process of the ulna

Actions: Extension of the elbow

Innervation:Radial nerve

Daily uses: Pushing a door closed

 

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Other muscles of the Upper Limb

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

 

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