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The "impulses" to skeletal muscles come primarily from alpha motor neurons in the ventral horn of the spinal cord. These neurons release acetylcholine on the muscles, which causes sodium to enter the muscle, leading to contraction. The alpha motor neurons themselves get input from several sources, such as the primary motor area in the cerebral cortex of the brain. However, even this brain area gets input from other brain areas, including sensory areas. In a certain sense, the impulses to the muscles "originate" from the environment in the form of sensory signals.
What else can I help you with?
How are diaphragm and intercostal muscles stimulated?
The diaphragm is stimulated the same way all other muscles are - nerve impulses that originate in the brain (or sometimes the spinal cord). The intercostal muscles expand during inhalation and contract during exhalation in response to the movement of the lungs by the diaphragm.
What are the brachial plexus?
The brachial plexus are nerves that leave the cervical vertebrae (but originate in the brain) and extend to peripheral structures (muscles/organs) to transmit motor and sensory nerve impulses.
What system controls muscles and regulates body activity?
The nervous system controls muscles and glands by electrical impulses.
What controlls your muscles?
Nerve impulses from your brain.
What part of the neuron carries impulses to the neuron?
The axon, an elongated portion of the neuron, carries impulses to the muscles.
The extrinsic muscles of the hand originate where?
The extrensic muscles of the hand originate from the lateral epicondyle of the humerous
Do motor neurons send impulses to muscles or glands?
Motor neurons send impulses to muscles to stimulate muscle contraction. Glands are typically innervated by autonomic neurons that regulate secretions like hormones and enzymes.
What part of the motor neuron carries impulses to the muscle?
The axon, an elongated portion of the neuron, carries impulses to the muscles.
How many muscles Originate on the scapula?
Seventeen muscles originate on the scapula, including the deltoid, trapezius, and subscapularis muscles. These muscles play a key role in shoulder movement and stability.
What Efferent nerves carry impulses primarily to the muscles and what?
glands
What is Neurons that convey impulses from the CNS to muscles or glands are what?
Interneurons
Similarities of motor and sensory neurons?
Sensory neurones carry impulses to the CNS, motor neurones carry impulses to muscles.
