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Tick Paralysis
Tick paralysis is the only tick-borne disease that is not caused by an infectious organism. The illness is caused by a neurotoxin produced in the tick's salivary gland. After prolonged attachment, the engorged tick transmits the toxin to its host. The incidence of tick paralysis is unknown. Patients can experience severe respiratory distress (similar to anaphylaxis). Signs and symptoms Tick paralysis results from injection of a toxin from tick salivary glands during a blood meal. The toxin causes symptoms within 2–7 days, beginning with weakness in both legs that progresses to paralysis. The paralysis ascends to the trunk, arms, and head within hours and may lead to respiratory failure and death. The disease can present as acute ataxia without muscle weakness. Patients may report minor sensory symptoms, such as local numbness, but constitutional signs are usually absent. Deep tendon reflexes are usually decreased or absent, and ophthalmoplegia and bulbar palsy can occur. Ele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tick-borne Disease
Tick-borne diseases, which afflict humans and other animals, are caused by infectious agents transmitted by tick bites. They are caused by infection with a variety of pathogens, including rickettsia and other types of bacteria, viruses, and protozoa. The economic impact of tick-borne diseases is considered to be substantial in humans, and tick-borne diseases are estimated to affect ~80 % of cattle worldwide. 18 tick-borne pathogens have been identified in the United States according to the Centers for Disease Control and at least 27 are known globally. New tick-borne diseases have been discovered in the 21st century, due in part to the use of molecular assays and next-generation sequencing. The occurrence of ticks and tick-borne illnesses in humans is increasing. Tick populations are spreading into new areas, in part due to climate change. Tick populations are also affected by changes in the populations of their hosts (e.g. deer, cattle, mice, lizards) and those hosts' p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nerve
A nerve is an enclosed, cable-like bundle of nerve fibers (called axons) in the peripheral nervous system. A nerve transmits electrical impulses. It is the basic unit of the peripheral nervous system. A nerve provides a common pathway for the electrochemical nerve impulses called action potentials that are transmitted along each of the axons to peripheral organs or, in the case of sensory nerves, from the periphery back to the central nervous system. Each axon, within the nerve, is an extension of an individual neuron, along with other supportive cells such as some Schwann cells that coat the axons in myelin. Within a nerve, each axon is surrounded by a layer of connective tissue called the endoneurium. The axons are bundled together into groups called fascicles, and each fascicle is wrapped in a layer of connective tissue called the perineurium. Finally, the entire nerve is wrapped in a layer of connective tissue called the epineurium. Nerve cells (often called neurons) are f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hart Of Dixie
''Hart of Dixie'' is an American comedy-drama television series that aired on The CW from September 26, 2011, to March 27, 2015. The series, created by Leila Gerstein, stars Rachel Bilson as Dr. Zoe Hart, a New Yorker who, after her dreams of becoming a heart surgeon fall apart, accepts an offer to work as a general practitioner in the fictional Gulf Coast town of Bluebell, Alabama. ''Hart of Dixie'' premiered on September 26, 2011. The show was scheduled to move back to Mondays in the fall for its third season, having been paired with '' Beauty & the Beast''. The show's third season premiered on October 7, 2013. On May 8, 2014, The CW renewed the show for its fourth season. On July 18, 2014, The CW president Mark Pedowitz announced that ''Hart of Dixie'' would have ten episodes for its fourth season, which premiered on December 15, 2014. On March 14, 2015, Leila Gerstein revealed that season four of ''Hart of Dixie'' would be its last. The CW officially canceled the show on M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
