Morphology of ulnar nerve in axilla & arm & its variations
Dr. Neelam Sinha, Dr. Sanjay Kumar Sinha, Dr. Ramji Prasad Singh
The ulnar nerve is the second commonest toinvolve in entrapment neuropathy. Thesevariations gain importance during surgicalprocedures of shoulder & elbow, when thepresence of an unexpected variation can leadto iatrogenic damage. Hence this study is planned wit the aim to find the variation on the ulnar nerve. The study was planned on total 20 embalmed human cadavers of both the sexes. The cadavers are of received from Department of Anatomy Nalanda Medical College & Hospital. The upper limb of the specimens was dissected as per the guidelines in the Cunningham Practical Manual. In the present study the presence of the ulnar nerve is observed in all specimens. The source of origin is observed from medial cord of the brachial plexus in in 95% of cases and from lateral root of the median nerve in 5% of cases. The level of origin is seen from the tip of the acromion in 95% of cases and from distal to the tip of the acromion process in 5% of cases. The Course of ulnar nerve is observed medial to axillary & brachial artery in 95% of cases and anterior to the third part of the axillary artery and brachial artery in 5% of cases. The differences in ulnar nerve can also responsible for arising difficulty in diagnosis of neurological syndromes. Worthy acquaintance of the distribution and variations of the ulnar nerve and its possible communications with the median nerve are appreciated in trauma to the upper limb.