The nerve loop around the lateral and medial pectoral nerves is called which?

• A. Plexus brachialis
• B. Ansa cervicis
• C. Nerve loop of intercostal nerves
• D. Ansa pectoralis

Answer: (D)

The concept here is a small nerve loop, called the ansa pectoralis, formed by the communications between the lateral and medial pectoral nerves around the pectoral muscles. The lateral pectoral nerve mainly supplies pectoralis major, while the medial pectoral nerve supplies pectoralis minor (and also contributes to pectoralis major). Their communicating branches create a loop around the pectoralis minor, ensuring coordinated innervation of the chest muscles. This specific loop is what the term ansa pectoralis refers to, so it’s the correct choice. The other options describe different nerve networks or regions (brachial plexus in the arm, ansa cervicis in the neck, or an intercostal nerve loop) and do not pertain to this pecotral nerve loop.