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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 right axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis muscle; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; LPN, lateral pectoral nerve; MN, median nerve; MPN, medial pectoral nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, communication between lateral and medial pectoral nerves; 1, nerve to biceps brachii from MN.
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Figure 1: Photograph of the right axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis muscle; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; LPN, lateral pectoral nerve; MN, median nerve; MPN, medial pectoral nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, communication between lateral and medial pectoral nerves; 1, nerve to biceps brachii from MN.

Mentions: In the right axilla, the lateral cord of BP had three branches i.e. lateral pectoral nerve, nerve to CB and lateral root of MN. The lateral pectoral nerve pierced the clavipectoral fascia and supplied the pectoralis major as usual but during its course it communicated with the medial pectoral nerve (MPN) of medial cord of BP (Fig. 1). The MCN was completely absent. The nerve to the CB was a small motor twig arising directly from the lateral cord which innervated the CB muscle. The lateral and medial root of MN formed the MN proper and descended between the biceps brachii and brachialis muscle. It then crossed the brachial artery from lateral to medial and finally entered the cubital fossa. In the arm, deep in the biceps brachii, the MN gave two branches: a direct branch to the biceps brachii and another long branch which, after supplying the brachialis muscle, continued as the LCNF and supplied the lateral side of the skin of forearm. The medial cord also varied in the origin of medial cutaneous nerve of arm and forearm arising from a single common trunk, which became separated in the middle of the arm (Fig. 2).


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 right axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis muscle; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; LPN, lateral pectoral nerve; MN, median nerve; MPN, medial pectoral nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, communication between lateral and medial pectoral nerves; 1, nerve to biceps brachii from MN.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Photograph of the right axilla showing the absence of musculocutaneous nerve. BA, brachial artery; BBr, biceps brachii muscle; CB, coracobrachialis muscle; CTMCAF, common trunk for medial cutaneous nerve of arm and forearm; LPN, lateral pectoral nerve; MN, median nerve; MPN, medial pectoral nerve; NCB, nerve to coracobrachialis; UN, ulnar nerve; arrow, communication between lateral and medial pectoral nerves; 1, nerve to biceps brachii from MN.
Mentions: In the right axilla, the lateral cord of BP had three branches i.e. lateral pectoral nerve, nerve to CB and lateral root of MN. The lateral pectoral nerve pierced the clavipectoral fascia and supplied the pectoralis major as usual but during its course it communicated with the medial pectoral nerve (MPN) of medial cord of BP (Fig. 1). The MCN was completely absent. The nerve to the CB was a small motor twig arising directly from the lateral cord which innervated the CB muscle. The lateral and medial root of MN formed the MN proper and descended between the biceps brachii and brachialis muscle. It then crossed the brachial artery from lateral to medial and finally entered the cubital fossa. In the arm, deep in the biceps brachii, the MN gave two branches: a direct branch to the biceps brachii and another long branch which, after supplying the brachialis muscle, continued as the LCNF and supplied the lateral side of the skin of forearm. The medial cord also varied in the origin of medial cutaneous nerve of arm and forearm arising from a single common trunk, which became separated in the middle of the arm (Fig. 2).

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