What is defined as an area of skin innervated by the sensory fibers of a single spinal nerve?

The definition of an area of skin innervated by the sensory fibers of a single spinal nerve is referred to as a dermatome. Each spinal nerve roots correspond to specific areas of the skin, which helps in identifying the location of nerve injuries or conditions affecting certain spinal segments. For example, if there is loss of sensation in a particular skin area, healthcare providers can determine which spinal nerve may be affected by assessing the corresponding dermatome. Understanding dermatomes is crucial in the diagnosis and management of various neurological and orthopedic conditions.

Myotome, on the other hand, refers to the muscle group innervated by motor fibers of a single spinal nerve, which distinguishes it from the sensory function of dermatomes. Neurotransmitter pertains to the chemical messengers in the nervous system that facilitate communication between neurons, and the reflex arc is the neural pathway that controls reflex actions. Each of these terms pertains to different aspects of the nervous system, with dermatome specifically focusing on skin sensation linked to spinal nerve roots.