SHOULDER-DELTOID
From NeuroRehab.wiki
SUMMARY
1. O: lateral 1/3 of the clavicle, acromion & inferior lip of the scapular spine.
2. I: deltoid tuberosity of the humerus.
3. NS: axillary n.
4. A: abduction, flexion/extension & internal/external rotation of the arm (everything except adduction!)
Image: OpenStax College [CC BY 3.0], via Wikimedia Commons [Accessed 20 Apr. 2019].
Reference(s)
R.M.H McMinn (1998). Last’s anatomy: regional and applied. Edinburgh: Churchill Livingstone.
Gray, H., Carter, H.V. and Davidson, G. (2017). Gray’s anatomy. London: Arcturus.