Dermatomes, Myotomes, and Spinal Nerve Plexuses

Question 1

dermatome

Answer 1

area of skin supplied with afferent nerve fibers by a single posterior spinal root

Question 2

myotomes

Answer 2

one or more muscles supplied by single efferent anterior root

Question 3

plexus innervation

Answer 3

Adjacent anterior rami merge to form plexuses in which their fibers are exchanged and redistributed, forming a new set of multisegmental peripheral (named) nerves