A Study Of Variation In Median Nerve Formation In Cadavers

Background: Median nerve is the nerve of the flexor compartment of forearm. Variations in the formation ofmedian nerve is common. Knowledge of such variations is important for the evaluation of nerve injuries in upperlimb region.Materials & methods: The study was done on 36 formalin fixed cadavers (72 upper limbs). The pattern offormation of median nerve in axilla was observed after performing meticulous dissection.Observations: Out of total 72 specimens, 67 upper limbs (93.06%) showed formation of median nerve by thefusion of two roots while in the remaining five specimens (6.94%), median nerve was formed by three roots. Outof those five specimens, all of them showed median nerve formation by two medial and one lateral root. Out ofthe total 72 specimens, three specimens showed communication between median and musculocutaneous nervein the arm region and two specimens showed absence of musculocutaneous nerve.Conclusion: This study has described the normal way of formation of median nerve as well as the variations in itsroots of formation.

Variations In Lateral Root Of Median Nerve

Background: Median nerve is formed in axilla by medial & lateral roots from medial & lateral cords of brachialplexus respectively. Variations of median nerve are not uncommon. Incidences of variations in lateral root aremore common than that of medial root. This study was undertaken to find out the different ways by which lateralroot contributes in formation of median nerve. These finding will provide anatomical basis for clinical correlationin case of neuropathies & surgeries of upper limb.Materials and Methods: 80 upper limbs were dissected to find out the variations of the lateral root in theformation of median nerve.Result and findings: Median nerve was formed in the axilla: - by one medial root & two lateral roots in 16.25%cases, one lateral root was thin & and the other was thick in 2.5% cases, 2nd lateral root joined the median nervein middle third of arm in 2.5 % cases. In 11.25 % cases median nerve was formed in the middle 1/3rd of arm bymedial & lateral root, 2nd lateral root joined it at lower 1/3rd of arm. In 2.5 % cases two small lateral roots joinedthe medial cord before it branched into ulnar nerve and medial root of median nerve ,a 3rd lateral root joined themedial root to form the median nerve. In 8.75 % median nerve was formed in axilla by one medial & two lateralroots; a 3rd lateral root joined it at lower part of axillaConclusion: Though, formation of median nerve by several lateral roots is considered to be a rare variation, inour study we observed 41.25% variations of different types.

Bilateral Abnormal Course Of Brachial Artery Related With The Median Nerve In Arm: A Case Report

Many formative variations of median nerve are known but this variant formation and course of median nerve israre. A variant formation of median nerve was noted in the axilla and arm of a male cadaver, in the form offormation of median nerve behind the third part of axillary artery and brachial artery wind around mediannerve. There may be compression of the nerve passing around the artery. This variation may be clinicallyimportant because symptoms of median nerve compression arising from similar variations are often confusedwith more common causes such as radiculopathy and carpal tunnel syndrome.During routine dissection, one of the cadaver showed bilateral abnormal course of brachial artery in the arm. Inthe right arm: In the axilla, median nerve present posterior to the artery. In the left arm: brachial artery twistingaround the median nerve. At the level of the neck of radius brachial artery dividing into radial and ulnar arteriesin both side of upper limb.