Optimal site of administration of the PECS 1 block

The pectoral nerves (PECS) 1 block requires injection of a local anesthetic injected into the space between the pectoral major muscle (PMM) and the pectoral minor muscle (PmM) at third ribs. The procedure is intended to block the intercostobrachial nerve, lateral cutaneous branch, and medial cutaneous nerve of the arm and forearm, and the long thoracic and thoracodorsal nerves. The block can also provide anesthesia to the lateral mammary area as it penetrates nerves in the axillary region [1,2].

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