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Nerve Regeneration - Everything You Need To Know - Dr. Nabil Ebraheim

Educational video describing the process of motor neuron injury and regeneration. Peripheral nerves have the ability to regenerate. The injured nerve fiber (Axon) is very long and it has to regenerate and reach its target in a reasonable time so that the patient can have a good function. The nerve has protective layers of tissue surrounding it: •Epineurium: surrounds the nerve itself •Perineurium:L around the fascicle •Fascicle •Nerve fiber •Endoneurium: around the axon •Myelin sheath •Axon The neurons become stimulated at the dendrites. Neurons possess structures that allow for the transmission of impulses and are composed of two parts: •Receiving structures: dendrites, cell body •Conducting structures: axon, axon terminal. Signals from the brain are passed on to the muscles in the limbs by these motor neurons. When painful stimulus is applied to a sensory receptor in the skin (afferent), the information is transmitted to the central nervous system (CNS). Once the sensory signal has been received by the CNS, another signal is then sent from the brain (efferent) and passed along the motor neurons in order to move the muscles in response to painful stimulus. When the nerve is affected or cut, there will be no function of that nerve. When the axon is separated from the body, there will be degeneration of the axon and the degeneration will stop at the synapse and will not travel to the next neuron. Regeneration of the peripheral nerves is possible and all events of regeneration occur around the axon when the nerve is cut. The proximal stump will regenerate and the distal stump will have Wallerian degeneration. Macrophagocytes dispose of the degenerated axon and myelin sheath. Schwann cells grew into the cut area and join the two ends. The entire axonal material is phagocytized from the site of the injury to the endplate. Anew generated axon sprouts and grow to reestablish the connection from reaching its target. •Wallerian degeneration: the neuron is able to survive and regenerate after the axon has been cut with neuronal survival and Wallerian degeneration. The Wallerian degeneration typically arises from severe nerve injuries such as axonotmesis or neurotmesis. The cell body increases in size with migration of the nucleus towards the cell periphery. The cell body enlarges for approximately 20 days and remains enlarged until axon regeneration is complete. In the proximal part of the nerve segment, degeneration can occur and it is proportionated to the severity of the injury. Degeneration extends proximally to the next node of Ranvier. Wallerian degeneration is seen in the distal portion of the nerve fiber. •Synthesis of growth-promoting molecules: axonal degeneration is followed by degradation of the myelin sheath and infiltration by macrophages.the macrophages are accompanied by Schwann cells which clear the debris from degeneration. Distally you will find Schwann cells proliferate and the axon sprouts (finger like growths) and advance. Using Schwann cells as a guide, these sprouts advance about 1 mm per day. Atrophy of the associated muscle will be seen during the process. •Regeneration & remyelination: axonal growth is seen and the connection is reestablished with the muscle appearing to be bigger and a bit healthier. When the axon fails to establish continuity, a neuroma formation will be seen with no regeneration of the axon distally. Atrophy of the associated muscle will be seen during the process. There are three types of nerve injuries: •Type I: neurapraxia: prognosis is good with neurapraxia and it’s the mildest form of nerve injury and the nerve remains intact. •Type II: axonotmesis: injury is severe. The axon is damaged and the surrounding connective tissue is intact. There will be partial or complete recovery of the nerve and Wallerian degeneration occurs distal to the nerve injury site. Recovery occurs 1 mm per day or 1 inch per month. •Type III: neurotmesis: no recovery, fibrillation is present and the injury usually requires surgery. Motor neuron unit potential is usually absent. In neurotmesis there will be degradation and neuroma formation. EMG and nerve injury •Degeneration (Wallerian): fibrillation •Reinnervation(Axon sprouting re-establishment of the connection): polyphasic motor activity is good. There are several factors that affect the success of recovery. If the gap between the proximal and distal stumps is too wide or scar tissue has formed, surgery can help to guide the sprouts to the tube. Factors affecting favourable nerve recovery after repair: •Younger age of the patient •Distal injury •No significant delay in repair •Sharp cuts are better than a crush •Vascularity is preserved •Favorable orientation of the nerve in epineural repair. Become a friend on facebook: Follow me on twitter:!/DrEbraheim_UTMC

5 Signs and Symptoms of Vitamin D Deficiency YOU NEED to Know

Follow us on Twitter: @foods4health1 Recipes4Health: To learn more about the health benefits of food, visit: Vitamin D is very important for our bodies since it effects a number of bodily functions. We often get this vitamin from exposure to sunlight, but it is also obtained by eating certain foods such as fish and dairy products. Vitamin D supplementation is also popular, since getting enough of this vitamin is difficult from diet alone. Unfortunately, there are quite a few individuals who are deficient in this vitamin without even knowing it as the signs and symptoms are either subtle or not well known. Over time this could have a negative effect on an individuals quality of life. Lets discuss some signs and symptoms of vitamin D deficiency. 1. Those who are vitamin D deficient may feel more fatigued and tired. Since there are so many reasons why we can feel tired and fatigued during the day, such as lack of sleep or obesity, vitamin D deficiency is often overlooked. Vitamin D deficiency can cause daytime fatigue or even make it harder to get out of bed in the mornings, even with quality sleep. 2. Vitamin D plays an important role in keeping our immune system strong and free from different bacteria and illness. This is because vitamin D directly effects the cells that are responsible for fighting against infection. Therefore, another sign and symptom of vitamin D deficiency is getting sick more often. Low levels of vitamin D can be a contributing factor to becoming infected with cold and flus more often. As well, it has been found that taking vitamin D supplements may reduce the risk of certain respiratory tract infections. 3. Another possible symptom of vitamin D deficiency is bone and lower back pain. Vitamin D is an important vitamin for maintaining overall bone health. It supports bone health and helps with the body’s absorption of calcium. It has been found that those individuals with a vitamin D deficiency were more like to have back pain which often limited their daily activities. As well, they were also more likely to have bone pain through out their bodies, such as in their legs and joints. A deficiency in this vitamin will not only cause bone pain, but it can also cause bone loss since it not only helps with calcium absorption, but also bone metabolism. This can lead to lower bone mineral density. 4. Vitamin D deficiency may also negatively effect our mood. Feelings of depression may be a sign of vitamin D deficiency. This has often been linked to older adults. By being deficient in this vitamin, it may also cause seasonal depression during the colder months, when exposure to sunlight is limited. Depression and all mental health symptoms are complex and should be discussed with your medical practitioner to determine its exact cause and remedy. 5. Lastly, another sign and symptom of vitamin D deficiency may be hair loss. When hair loss is severe, this can be the result of nutrient deficiency. Hair loss may be a sign of vitamin D deficiency in female-patten hair loss. As well, there have been links found between low levels of vitamin D and alopecia areata, and low levels of this vitamin may be a risk factor for developing this autoimmune disease which can effect hair loss. Be sure to discuss any of the above signs and symptoms with your medical practitioner to determine their exact cause and also to discuss the correct amount of vitamin D you should be taking daily to support your health. Thank you for watching the video! Please like, comment and share. If you would like to hear about more healthy foods, and food and beauty tips, please subscribe to the channel. Have a GREAT and HEALTHY day! DISCLAIMER: This video is for educational and informational purposes only. While we have tried to ensure that the information is sound and accurate, we cannot guarantee its accuracy. The information in this video should not be substituted for professional medical advice and opinions. If you are experiencing any ailments, serious or otherwise, always seek professional medical treatment and advice.

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