Motor neuron

system and the autonomic nervous system. 2. What are Neurons? Describe the key parts of Neurons, including: Dendrites, Myelin, Axons, and Synapse. To keep it simple, a neuron is a nerve cell. Most neurons are very similar to a typical cell, but have a few structures that set it apart. The main part of the cell is known as the soma, or cell body. In the soma is the nucleus, which contains the genetic material known as chromosomes. A neuron has dendrites, and a…

gathers information about and reacts to internal and external stimulus. Don’t Shoot the Messenger Much of the CNS is made up of neurons. Each neuron has a cell body, which includes a soma with a nucleus, a nucleolus, a cytoplasm called the perikaryon, and wide branching extensions called dendrites. Dendrites are like antennae which receive signals from other neurons or body cells. Their plasma membranes and cell bodies contain many receptor sites for binding chemical messengers, or…

Co-activation is seen in this experiment where the bicep, the flexor, resembles the agonist and the triceps, the extensors, resemble the antagonist. When the bicep muscle is active by being in its flexed position; its motor neurons are excited whereas the motor neurons in opposition of the triceps are somewhat inhibited. However, these triceps muscles still contribute to minor activities compared to that of the bicep muscles; but together they work in a co-activation fashion for contractile…

ganglia motor circuit. The motor circuit consists of sending output information to the cerebral cortex , pedunculopontine nucleus and the midbrain locomotor area. The direct pathway consists of the the substantia nigra via the nigrostriadal pathway sends dopamine cells that are excitatory to the globus pallidis internus . The globus pallidus is inhibited creating disinhibition of the thalamus and excitory neurons are sent to the motor cortex. The result is facilitation to the lower…

disease. ALS is the deterioration of motor neurons in the brain and spinal cord that leads to muscle weakness. This significant decrease in muscle strength eventually becomes paralysis, and the majority of those with this awful disease die from respiratory failure. This is the most common neuromuscular disease and affects 12,000 people annually and about 4 out of every 100,000 people (National Institute of Neurological,…

Mirror Neurons: Discussion and Debates The average human brain weighs only three pounds, yet the intricacy surrounding its capabilities are one of the most sought after mysteries, with regard to human anatomy. Dr. V.S. Ramachandran (2010) explains that the brain is the housing for approximately 100 billion neurons all interacting in a phenomenal number of differing connections. In studying how neural processes develop, mirror neurons were identified. Although this is a complex topic which…

Upon development, the nervous system wires itself completely – an impressive feat considering the millions of connections and neurons in the body. However perhaps even more impressive is the ability of the nervous system to restore neuronal connections after injury. This is particularly advanced in frogs, fish and invertebrates as once an axon is cut in the central nervous system, the regeneration allows full functional recovery whereas in the mammalian central nervous system full recovery is…

through sense organs, translates messages, process and respond to both internal and external stimuli (Saladin, 2012 p440). Nervous system uses chemical and electrical signal to communicate from neurons to another at high speed. More than 100 billion neurons found in the brain. Basic part of what make neurons are consist of dendrites which receives send messages, cell soma which is the cell body that process and translate code messages, and the axon where processed messages pass through to…

are the 3 major types of neurons? How are they functionally different? Why are the functional differences important? There are 3 major neurons that the nervous system uses to carry information throughout the body; sensory neurons, interneurons, and motor neurons. Each type of neuron, all functionally different, interacts with the central nervous system, the brain, and the muscles of the body. Some vary in shape and sizes as well as differ in simplicity and complexity. Neurons play a big role in…

fibers that are innervated by a motor neuron is dependent on what muscle it is. Fine motor movements, such as typing, would need only a few muscle fibers. This means that the thumb has only a few fibers, but the thigh, back, and biceps have many. These need a lot more force to be exerted, which is why they need more muscle fibers. Using your thumb and bladder does not require many muscle fibers. 2. Alpha motor neurons innervate extrafusal muscles but gamma motor neurons innervate only intrafusal…