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Bilateral absence of musculocutaneous nerve with unusual branching pattern of lateral cord and median nerve of brachial plexus.

Bhanu PS, Sankar KD - Anat Cell Biol (2012)

Bottom Line: The median nerve, after supplying the biceps and brachialis muscles, gave onto the lateral cutaneous nerve of the forearm.The median nerve also showed variation on the left side where it was formed by two lateral roots and one medial root.Variations of the brachial plexus are of great interest to anatomists, clinicians and surgeons, in that they may be incorporated in their day to day practice.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy, Narayana Medical College, Nellore, Andhra Pradesh, India.

ABSTRACT
A 43-year-old female cadaver showed a complete bilateral absence of the musculocutaneous nerve. The anterior compartment muscles of both arms were supplied by median nerve excepting the coracobrachialis which was innervated by a direct branch from the lateral cord of brachial plexus. The median nerve, after supplying the biceps and brachialis muscles, gave onto the lateral cutaneous nerve of the forearm. The median nerve also showed variation on the left side where it was formed by two lateral roots and one medial root. Variations of the brachial plexus are of great interest to anatomists, clinicians and surgeons, in that they may be incorporated in their day to day practice. Our present case may be noted for its clinical and surgical significance in the variations of brachial plexus which can be useful for diagnostic purposes.

No MeSH data available.


Related in: MedlinePlus

Photograph of the left axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; MN, median nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, single long trunk from MN; arrowhead, additional lateral root of MN from lateral cord; 1, nerve to biceps brachii from the single long trunk of MN.
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Figure 3: Photograph of the left axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; MN, median nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, single long trunk from MN; arrowhead, additional lateral root of MN from lateral cord; 1, nerve to biceps brachii from the single long trunk of MN.

Mentions: The lateral cord of BP in the left axilla branched four times: the lateral pectoral nerve; nerve to CB and lateral root of MN and an additional lateral root of MN. The MCN was absent and the nerve to CB was a small twig which supplied and terminated in the muscle itself (Fig. 3). No communication between lateral and MPNs was found.


Bilateral absence of musculocutaneous nerve with unusual branching pattern of lateral cord and median nerve of brachial plexus.

Bhanu PS, Sankar KD - Anat Cell Biol (2012)

Photograph of the left axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; MN, median nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, single long trunk from MN; arrowhead, additional lateral root of MN from lateral cord; 1, nerve to biceps brachii from the single long trunk of MN.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472148&req=5

Figure 3: Photograph of the left axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; MN, median nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, single long trunk from MN; arrowhead, additional lateral root of MN from lateral cord; 1, nerve to biceps brachii from the single long trunk of MN.
Mentions: The lateral cord of BP in the left axilla branched four times: the lateral pectoral nerve; nerve to CB and lateral root of MN and an additional lateral root of MN. The MCN was absent and the nerve to CB was a small twig which supplied and terminated in the muscle itself (Fig. 3). No communication between lateral and MPNs was found.

Bottom Line: The median nerve, after supplying the biceps and brachialis muscles, gave onto the lateral cutaneous nerve of the forearm.The median nerve also showed variation on the left side where it was formed by two lateral roots and one medial root.Variations of the brachial plexus are of great interest to anatomists, clinicians and surgeons, in that they may be incorporated in their day to day practice.

View Article: PubMed Central - PubMed

Affiliation: Department of Anatomy, Narayana Medical College, Nellore, Andhra Pradesh, India.

ABSTRACT
A 43-year-old female cadaver showed a complete bilateral absence of the musculocutaneous nerve. The anterior compartment muscles of both arms were supplied by median nerve excepting the coracobrachialis which was innervated by a direct branch from the lateral cord of brachial plexus. The median nerve, after supplying the biceps and brachialis muscles, gave onto the lateral cutaneous nerve of the forearm. The median nerve also showed variation on the left side where it was formed by two lateral roots and one medial root. Variations of the brachial plexus are of great interest to anatomists, clinicians and surgeons, in that they may be incorporated in their day to day practice. Our present case may be noted for its clinical and surgical significance in the variations of brachial plexus which can be useful for diagnostic purposes.

No MeSH data available.


Related in: MedlinePlus