Type of Article : Orginal
Year: 2014 | Volume 2 | Issue 4 | Page No. 677-680
Date of Publication: 30-11-2014
MORPHOLOGY OF ULNAR NERVE IN AXILLA & ARM & ITS VARIATIONS
Vijay Kumar S *1, Priya Ranganath 2.
*1 Assistant Professor, Department of Anatomy, Basaveshwara Medical College Hospital and Research Centre, Chitradurga, Karnataka, India.
2 Professor & Head, Department of Anatomy, Bangalore Medical College & Research Institute, Bangalore, Karnataka, India.
Address: Dr. Vijay Kumar S, Assistant Professor, Department of Anatomy, Basaveshwara Medical College Hospital And Research Centre, Chitradurga, Karnataka, India.
The ulnar nerve arises from the medial cord (C8, T1); medial cord also receives fibres from the ventral ramus of C7. Lesions of the ulnar nerve occur behind the medial epicondyle & in the cubital tunnel. When muscles are affected due to ulnar nerve dysfunction, there is ulnar neuropathy at the shoulder, arm & elbow.
The study was done on 50 embalmed human cadavers (25 right & 25 left) of both sexes of South Indian adult population obtained from the Department of Anatomy, Bangalore Medical College and Research Institute, Bangalore.
Variations in the ulnar nerve in its presence, origin, relations, distribution & communications were observed. Ulnar nerve was present in all 50 upper limb specimens (100%). Ulnar nerve originated from the medial cord of the brachial plexus in 49 cases (98%). In 1 case (2%), the ulnar nerve received C7 fibers from lateral cord i.e. the lateral root of the median nerve and then later fused with the median root of the median nerve. In 49 specimens (98%) ulnar nerve took origin from the tip of the acromion processes. In 1 case (2%) it took origin from distal to the tip of the acromion process. 49 specimens (98%) showed the normal course, i.e. medial to axillary & brachial artery. 1 case (2%) showed ulnar nerve present anterior to the third part of the axillary artery and brachial artery. In the midarm it passed medially as a normal course, then runs distally through the cubital tunnel.
The awareness of these variations along the normal pattern are helpful for the interventional radiologists, orthopaedicians and neurologists in preventing untoward iatrogenic injury to the ulnar nerve during radiological procedures or operating on fractured patients or diagnostic therapy.
KEYWORDS: Ulnar Nerve, Axilla, Arm, Morphology, Cadaver, Variations, Median Nerve.
- Standring S. Gray’S Anatomy. 40thedn. Churchill Livingstone: Elsevier. London. 2008; 780-781.
- Sachdeva K, Singla RK. An unusual origin of an ulnar nerve from a median nerve – a case report; Journal of Clinical and Diagnostic Research, 2011; 5(6): 1270-1271.
- Goncalves J, Duparc F, Auquit- Auckbur I, Milliez PY. Constitutional anomalies of the terminal branches of the brachial plexus in the axial and the brachial regions. Results of 42 cases and review of literature. Ann Chir Plast Esthet, 2002; 47(1): 30-35.,
- Chaware PN, Ughade JM, Pandit SV, Maske GL. Variant branches of brachial plexus – a case report. International Journal of Anatomical Variations, 2012; 5: 5–7.
- Sontakke BR, Tarnekar AM, Waghmare JE, Ingole IV. An unusual case of asymmetrical formation and distribution of median nerve – A Case Report. International Journal of Anatomical Variations, 2011; 4: 57–60.
- Ramachandran K, Kanakasabapathy I, Holla SJ. Multiple variations involving all the terminal branches of the brachial plexus and the axillary artery – a case report. Eur J Anat, 2006; 10 (3): 61-66.
- Jamuna M. Clinically significant variations of the cords of the brachial plexus in relation to axillary artery – a case report. International Journal of Anatomical Variations, 2011; 4: 9-11.
- Arora L, and Dhingra R. Unusual nerve supply of biceps from ulnar and median nerve and third head of biceps. a case report. Indian Journal of Plastic Surgery, July- December 2006; 39(2): 172-174.
- Gupta M, Goyal N, and Harjeet. Anomalous communications in the branches of brachial plexus – a case report. The Journal of Anatomical Society of India, 2005; 54(1): 01-03.
Vijay Kumar S, Priya Ranganath. MORPHOLOGY OF ULNAR NERVE IN AXILLA & ARM & ITS VARIATIONS. Int J Anat Res 2014;2(4):677-680. DOI: 10.16965/ijar.2014.523