Electrical impulses telling them to contract or relax.
Essentially nothing but to carry them around. There are nerves that try to keep track of what muscles are doing ... but the muscles are not actually involved with this.
The Phrenic & Intercostal nerves.
glands
The nerves that carry activating impulses to the muscles of inspiration are primarily the phrenic nerves. These nerves originate from the cervical spinal cord (C3-C5) and innervate the diaphragm, the primary muscle of respiration. Additionally, the intercostal nerves, which arise from the thoracic spinal nerves, stimulate the intercostal muscles that assist in expanding the thoracic cavity during inhalation. Together, these nerves coordinate the process of breathing.
remember the word SAMESensory are AfferentMotor are Efferent
Nerves carry messages to the muscles to react. Nerves help us feel pain, heat, and cold.
Sensory nerves carry impulses to the brain (as sights seen, sounds heard, etc.). Motor nerves carry impulses from the brain to cause the body to do things such as move muscles.
CMT decreases the ability of these nerves to carry motor commands to muscles, especially those furthest from the spinal cord located in the feet and hands. As a result, the muscles connected to these nerves eventually weaken
Sensory nerves are called afferent nerves, and motor nerves are called efferent nerves. Afferent nerves carry sensory information from the body to the central nervous system, while efferent nerves carry signals from the central nervous system to the muscles and glands to initiate a response.
Somatic nerves from the somatic nervous system
All skeletal muscles in the body must be supplied by somatic motor nerves. These nerves carry signals from the brain to the muscles, controlling voluntary movements.
A mixed nerve contains both sensory and motor nerves. Sensory nerves carry information from sensory receptors to the central nervous system, while motor nerves carry signals from the central nervous system to muscles and glands.