Nerves

A neuron is best described as a specialized cell in the nervous system that transmits electrical and chemical signals. It consists of a cell body, dendrites that receive signals, and an axon that sends signals to other neurons or muscles. Neurons play a crucial role in processing and communicating information throughout the body, enabling functions such as movement, sensation, and cognition.

At the start of a nerve impulse, also known as an action potential, there is a rapid change in the ionic composition of the neuron. Sodium (Na+) channels open, allowing Na+ ions to flow into the cell, which depolarizes the membrane and shifts the internal charge from negative to positive. This depolarization is followed by the opening of potassium (K+) channels, allowing K+ to exit the cell, which eventually helps to repolarize the membrane. The coordinated movement of these ions is crucial for the propagation of the nerve impulse along the neuron.

Chemical-gated channels, also known as ligand-gated channels, are primarily found in the dendrites and the cell body (soma) of a neuron. These channels open in response to the binding of neurotransmitters, allowing ions to flow into or out of the neuron, which can lead to depolarization and the generation of an action potential if the threshold is reached. This mechanism is crucial for synaptic transmission and the integration of signals.

The bone that protects the eye are the facial bone. It's function is for you to be able to see.

Motor neurons play a crucial role in the reflex arc by transmitting signals from the spinal cord to the muscles. When a sensory neuron detects a stimulus, it sends a signal to the spinal cord, where interneurons process the information and activate the motor neurons. This leads to an immediate response, such as muscle contraction, allowing for a quick reaction to stimuli without the need for conscious thought. Thus, motor neurons are essential for executing the reflex action in response to external stimuli.

Acetylcholine is degraded in the synapse primarily by the enzyme acetylcholinesterase. This enzyme hydrolyzes acetylcholine into acetate and choline, preventing its accumulation and ensuring rapid termination of the neurotransmitter's action. By breaking down acetylcholine, acetylcholinesterase helps maintain proper signaling between neurons and muscle cells, allowing for precise control of muscle contraction and other physiological processes.

ooh, you're in trouble dude! see a doctor, you may probably have to get a shot to get rid of it. Maybe a urinary tract infection. My mom used to make me drink pure cranberry juice for a day or two to make it go away.

hi all denervation hypersenstivity means... the remaining spinal exictatory ending release mediators that cause hypersensitivity.. as a compansatory mechanism to compnsate the lesion occurs.. this leads to sprouting of collaterals from existing neurons with formation of additional exitatory endings on inter neurons and motor neurons.. and that what explains return of reflexs and some activity after the end of spinal shock post to lesion whether its UMNL or LMNL. and its the base of rehabilitaion and control of the unvolntry movement and spasticty developed below the level of lesion due to dessuction of the desinding signals.. physical therapy... work in rehabiltaion programs for neurological disorder.

the nucleus.

Electrical forces push sodiun ions out of the cell

Dendrites are the multi-branched projections off the nerve cell body.

Place finger pressure on the proximal and distal branches of the nerve where then run under the medial side of the heel (about 2/3rds of the way from the back of the heel and at the beginning of the inner longitudinal arch). It will be extremely painful to palpate these areas.

During depolarization Na channels are open

During repolarization K channels are open

dose leech has nervous system?

Yes, you may still have a stretch reflex with a cervical nerve injury.

nerve pathways

Neuron

Summation is the method in which signal transmission between neurons occurs. Summation occurs through excitatory neurotramitters and inhibitory neurotransmitters. Excitatory produces depolarization of the postsynaptic cell. Inhibitory mitigates the effects of an excutatory neurotransmitter.

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required to maintain nerve fiber sheath

The musculocutaneous nerve