Examine cutaneous nerves in the thorax. A row of dorsal cutaneous nerves (1) emerges laterally on the thorax (and abdomen), in contrast to the neck where dorsal cutaneous nerves emerged from the dorsal midline. A row of lateral cutaneous nerves (2) emerges mid-laterally on the thorax (and abdomen). The initial lateral cutanous nerve (from T-2) spreads over the brachium and is named intercostobrachial n. (3). The thorax also features small ventral cutaneous nerves (not shown) that emerge near the ventral midline.

The reflected cutaneous trunci m. (4) is innervated by the lateral thoracic n. (5) a muscle (motor) nerve that originates from the brachial plexus.

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