front 1 CERVICAL PLEXUS | back 1 C1-C5 and innervates the neck and extends into the thoracic cavity controlling the diaphragm. |
front 2 BRACHIAL PLEXUS | back 2 C4, C5, and T1 and innervates the pectoral girdle and upper limbs. |
front 3 LUMBAR PLEXUS | back 3 T12 and L1-L4 and innervates the pelvic girdle |
front 4 SACRAL PLEXUS | back 4 L4, L5, and S1-S4 and innervates the lower limbs and bladder functions. |