What nerve branch networks supply the head, neck, upper chest, and shoulders?

The cervical plexus is responsible for providing nerve supply to areas such as the head, neck, upper chest, and shoulders. It is a network of nerves that emerge from the cervical spinal nerves (C1-C4) and includes branches that innervate various structures. Key nerves, such as the phrenic nerve (which innervates the diaphragm), and the lesser occipital, greater auricular, transverse cervical, and supraclavicular nerves, arise from the cervical plexus, providing sensory and motor functions.

In contrast, the brachial plexus primarily supplies the upper limb, including shoulder and arm areas, arising from the spinal nerves C5-T1. The thoracic plexus, which consists mainly of intercostal nerves, is involved in supplying the thoracic region and does not cover the head and neck. The lumbar plexus, made up of spinal nerves L1-L4, primarily innervates the lower abdominal wall, groin, and parts of the lower limb. The cervical plexus is the correct answer as it specifically targets the head, neck, upper chest, and shoulder regions.