İki karınlı musculus scalenus anterior ve aralarından geçen truncus superior olgusu
13. Ulusal Anatomi Kongresi, Girne, Turkey, 28 October - 01 November 2010, pp.65, (Full Text)
- Publication Type: Conference Paper / Full Text
- City: Girne
- Country: Turkey
- Page Numbers: pp.65
- Istanbul University Affiliated: Yes
Abstract
Case: During educational dissections in our department, it was observed that the right anterior scalene muscle had two bellies, and the superior trunk of the brachial plexus passed between
them in a 65-year-old male cadaver. The subclavian artery, the middle trunk and the inferior trunk passed between the anterior and middle scalene muscles, while the subclavian vein passed in front of the anterior scalene muscle. The anterior belly of the anterior scalene muscle took its origin from the transverse process of the fifth cervical vertebra (C5), and the posterior belly from the C3 and C4; those two bellies united distally and attached to the first rib.
Discussion and Conclusion: Scalene muscles can be subject to variation regarding the number of their attachments on vertebrae and costae, and they can show different patterns in joining of its fasciculi. The anterior and middle scalene muscles can exchange their fibers, or – as in our case – anterior scalene muscle with two bellies can be found. In the literature it was reported that the superior trunk passes between the two bellies of the anterior scalen in 10% of the cases. In cases with two bellies, arteries or nerves can pass between those bellies and can be compressed, and this compression can cause clinical symptoms. In the differential diagnosis of sensation problems of the upper extremity, these kinds of variations should be kept in mind.