MUSCLES-ROTATOR CUFF, PART 1
SUMMARY
MNEMONIC: SSIT!
1. Supraspinatus: arises from the medial 3/4 of the supraspinous fossa & upper surface of the scapular spine. Inserted into the upper facet of the greater tuberosity. A bursa separates it from the lateral 1/4 of the supraspinous fossa. Supplied by the suprascapular nerve (C5 & C6). Abducts the shoulder (first 15o).
2. Subscapularis: arises from the medial 4/5 of the costal surface of the scapula & concave axillary border of scapula & intermuscular septa. Inserted to the lesser tuberosity of the humerus & medial lip of the intertubercular groove. The muscle is separated from the bare area of the lateral angle of the scapula by a subscapular bursa, which communicates laterally with the cavity of the shoulder joint. Supplied by the upper & lower subscapular nerves (C5 & C6). Medial rotator of the humerus.
Image: By National Institute Of Arthritis And Musculoskeletal And Skin Diseases (NIAMS); SVG version by Angelito7 - Shoulderjoint.PNG, Public Domain, Link [Accessed 16 Apr. 2020].
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.
