Afferent
Sensory, to brain
Efferent
Motor, from brain
Cervical Plexus
C1-C5, Phrenic nerve
Brachial Plexus
C5-C8, T1, Radial, Ulnar, Median nerves
Lumbar Plexus
T12-L5, Femoral nerve
Sacral Plexus
L4-S4, Sciatic nerve
Dermatomes are
Regions of skin with correlation to specific nerves