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Motor end plate -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-09) Motor end plate -- Facts, Info, and Encyclopedia article A motor end plate is the innervation of a (An elongated contractile cell that forms the muscles of the body) muscle fiber which causes ((physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber)) muscle contraction. Motor neurons can innervate from one to over 100 muscle fibers. www.absoluteastronomy.com /encyclopedia/m/mo/motor_end_plate.htm   (63 words)

Electromyography motor end-plate), a nerve impulse (action potential) causes the release of a quantum of acetylcholine vesicles which diffuse across the cleft (synapse) to the muscle cell membrane. The plate electrodes used to record the EMG are the same used for recording the electrocardiogram (EKG). With the EMG plate electrodes it is possible to demonstrate the presence of electrical activity of a specific muscle (or group of muscles) for specific mechanical functions. www.elon.edu /shouse/physiology/frog/emg/frogemg.html   (1529 words)

Neuromuscular junction - Wikipedia, the free encyclopedia A neuromuscular junction is the junction of the axon terminal of a motoneuron with the motor end plate, the highly-excitable region of muscle fiber plasma membrane responsible for initiation of action potentials across the muscle's surface. Upon the arrival of an action potential at the axon terminal, calcium ions flow from the extracellular fluid into the motoneuron's cytosol and bind to particular intracellular proteins. The receptors are ion channels, and when bound by acetylcholine, they open, allowing sodium and potassium ions to flow in and out of the muscle's cytosol, respectively. en.wikipedia.org /wiki/Neuromuscular_junction   (212 words)

Clinical use of Peripheral Nerve Stimulator   (Site not responding. Last check: 2007-10-09) The impulse passing down a motor nerve is transmitted to a muscle across the motor end plate or neuromuscular junction. Physiological conduction across the neuromuscular junction is by depolarization of the motor end plate by acetylcholine. Normally at the end of surgery, the residual effects of non-depolarizing relaxants are reversed with atropine and neostigmine. www.life-tech.com /pns/pnscu.html   (1303 words)

THE EXCITATION Generally, each muscle fiber (cell) is innervated by a single motor neuron near the center of the muscle fiber. Despite the presence of the synaptic cleft between the axon terminal of a motor nerve and the motor end plate of the muscle fiber, the axon terminal appears to be buried in the surface of the muscle cell (ie. The cell body of motor neurons are in the spinal cord or in the brain stem. faculty.etsu.edu /currie/excitation.htm   (1209 words)

PSM11J c. Acetylcholine attaches to receptors on the motor end plate of the sarcolemma. Motor unit - A motor neuron plus all of the muscle cells which it innervates. It is found in the ciliary body and iris of the eye as well as in the walls of the blood vessels, and the arrector pili muscles of the hair follicles. www.accd.edu /sac/biology/ratorres/printouts/psm11j.htm   (4306 words)

Neuromuscular Junction   (Site not responding. Last check: 2007-10-09) The motor end plates at the distal ends of the axon terminal filaments of a motor nerve. The plates represent the nervous contribution to the neuromuscular junctions. The axon terminal filaments are the segmented lines leading to the plates. www.dmacc.cc.ia.us /instructors/neuromus.htm   (78 words)

Muscle Contraction (2) A motor neuron in the ventral horn of the spinal cord is activated, and an action potential passes outward in a ventral root of the spinal cord. (3) The axon branches to supply a number of muscle fibers called a motor unit, and the action potential is conveyed to a motor end plate on each muscle fiber. (4) At the motor end plate, the action potential causes the release of packets or quanta of acetylcholine into the synaptic clefts on the surface of the muscle fiber. meat.tamu.edu /muscontract.html   (530 words)

NMJ vs. Spine Synapse   (Site not responding. Last check: 2007-10-09) An electron-dense inner dense plate is formed between cisterns of spine apparatus derived from smooth endoplasmic reticulum in dendritic spines of larger (mushroom-shaped) type, radiating out as the outer dense plate and coming into contact with the postsynaptic density or with associated punctum adherens (Figs. Elucidation of the above mentioned considerations are needed by ultrastructural analysis of unmasked cytoskeleton in motor end plates. Microfluorometric detection of the concentration gradient of calcium during the generation of the action potential in the motor end plate should elucidate whether the microcompartment hypothesis is applicable not just to neuronal dendritic spines but also to the motor end plate interfolds. synapses.mcg.edu /anatomy/nmj/similar.stm   (625 words)

[No title]   (Site not responding. Last check: 2007-10-09) Muscle fibers are innervated by motor neuron axons at special locations along the fiber called neuromuscular junctions or the motor end plate. When the impulse reaches the motor end foot of the motor neuron axon, Ach is released and diffuses to the sarcolemma causing an action potential on the sarcolemma. Thus, the ability of the sarcolemma and T tubules to conduct impulses in response to stimulation by motor neuron axons at the motor end plate results in the release of calcium ions by the terminal cisternae of the SR, thereby effecting contraction of the fibrils and ultimately the entire muscle fiber. www.holycross.edu /departments/biology/whealy/notes_text/bi.text   (360 words)

Arch Otolaryngol Head Neck Surg -- Abstract: Motor end-plate distribution in the human interarytenoid muscle, January ... Arch Otolaryngol Head Neck Surg -- Abstract: Motor end-plate distribution in the human interarytenoid muscle, January 1987, Freije et al. The motor end-plates of four IA specimens obtained from normal The three-dimensional distribution of motor end-plates was later archotol.ama-assn.org /cgi/content/abstract/113/1/63   (120 words)

Motor end plate (neuromuscular junction)   (Site not responding. Last check: 2007-10-09) Signals passed down through nerves to stimulate muscle contraction, need to be converted from an action potential into a chemical signal at the neuromuscular junction. The signals reach the end of the nerve and enter a structure called the synaptic end bulb. The signal triggers synaptic vesicles stored in the end bulb to release a signaling chemical into the synaptic gap. clem.mscd.edu /~raoa/muscleweb/tsld018.htm   (108 words)

Neuromuscular Junction   (Site not responding. Last check: 2007-10-09) The moderately elevated motor end plate of skeletal muscle fiber forms a central depression with lamellar folds and grooves covered with the basal lamina (Fig. In terminal branches of the motor axon covered with the Schwann cell, synaptic vesicles are accumulated along bands of active zones, an orientation of which corresponds with that of the folds (Fig. The infoldings are numerous in mammals, very numerous in frog fast muscle fibres, capable of eliciting action potentials, sparse in frog slow muscle fibres, unable to generate action potentials and almost absent in fish muscles (Couteaux, 1981; Pannesse, 1994; Peters et al., 1991). synapses.mcg.edu /anatomy/nmj/nmj.stm   (485 words)

Cholinergic Transmission Although the end result of curare poisoning is similar to that of excess acetylcholine at the motor end plate, as described in the last story, there is an important and fundamental difference. The cause of death in myasthenia, in poisonings by curare or anticholinesterases and in succinylcholine overdose is respiratory failure secondary to paralysis of respiratory muscles. Myasthenia is an auto-immune disease, but the antibodies are directed against the motor end plate, not acetylcholine as stated in the story. www.dartmouth.edu /~rpsmith/Cholinergic_Transmission.html   (11031 words)

Motor End Plate Small intrafusal muscle fibers (modified muscle cells) together with sensory (afferent) nerve endings wrapped around them are found in the fluid-filled, non-contractile central region of the spindle. In the polar regions of the spindle, efferent (motor) nerve endings contact contractile myofilaments. A Motor Neuron and all the muscle fibers it innervates constitutes a Motor Unit. www3.umdnj.edu /histsweb/lab6/skeletalmuscle/skmotorend.html   (436 words)

Healing People Network L.P.   (Site not responding. Last check: 2007-10-09) Dysfunctional end plate activity occurs (commonly associated with a strain), which causes acetylcholine (ACh) to be excessively released at the synapse, often associated with the presence of excess calcium. As the end plate keeps producing ACh flow, the actin/myosin filaments slide to a fully shortened position (a weakened state) in the immediate area around the motor end plate (at the centre of the fibre). Motor points are consistently located (with a few exceptions) in the centre of the muscle fibreís belly. www.healingpeople.com /ht/index.php?option=content&task=view&id=378&It...   (3777 words)

SECTION 7 - J   (Site not responding. Last check: 2007-10-09) Gamma motor neurons innervate the contractile polar regions of the intrafusal fibers. Contraction at both ends of the intrafusal fiber pulls on the central region, causing the stretch-sensitive sensory endings to fire. This action potential is received by some of the alpha motor neurons in the anterior horn innervating the stimulated muscle which fire action potentials back to the muscle that was stretched (quadriceps femoris), causing the innervated motor units to twitch in response. socrates.berkeley.edu /~alanburr/neurobio/studentsyll97/7kimomotorbasicreflex.htm   (7415 words)

Example: Motor Unit   (Site not responding. Last check: 2007-10-09) All of the motor end plates in this teased preparation are served by collateral branches of the same axon. In vertebrates (but not invertebrates) there is one motor end plate per myofiber and there is one axon which controls a group of motor end plates. Eventually, if all the motor units are in use and there is no reserve of rested and ready ones, the muscle shows complete fatigue and force generation has to be halted. education.vetmed.vt.edu /Curriculum/VM8054/Labs/Lab10/Examples/exmtruni.htm   (241 words)

Chapter 10: Muscle Tissue The motor end plate has deep creases called junctional folds, which increase its surface area and thus the number of available ACh receptors. Molecules of ACh diffuse across the synaptic cleft and bind to ACh receptors on the motor end plate. The sudden influx of sodium ions results in the generation of an action potential in the sarcolemma at the edges of the motor end plate. cwx.prenhall.com /bookbind/pubbooks/martinidemo/chapter10/medialib/CH10/html/ch10_4_1.html   (763 words)

The Sodium Channel Scn8a Is the Major Contributor to the Postnatal Developmental Increase of Sodium Current Density in ... Duchen LW, Stefani E (1971) Electrophysiological studies of neuromuscular transmission in hereditary "motor end-plate disease" of the mouse. Duchen LW, Searle AG, Strich SJ (1967) An hereditary motor end-plate disease in the mouse. Kohrman DC, Smith MR, Goldin AL, Harris JB, Meisler MH (1996b) A missense mutation in the sodium channel gene Scn8a is responsible for cerebellar ataxia in the mouse mutant jolting. www.jneurosci.org /cgi/content/full/18/14/5234   (4161 words)

Neuromuscular Junctions   (Site not responding. Last check: 2007-10-09) if one motor neuron controlled all the muscle fibers in an entire muscle, every time that motor neuron was active, the entire muscle would contract. The specialized region on the muscle fiber is called the motor end plate (that's just a fancy way of saying that it is the muscle's postsynaptic terminal, "post" for after, because the information is received at this end). When ACh comes in contact with the AChRs on the motor end plate, the AChRs are able to trigger the generation of an AP on the sarcolemma. distance.stcc.edu /AandP/AP/AP1pages/Units5to9/Unit7/neuromus.htm   (716 words)

Nursing: Neuromuscular blockers: Less is more When the impulse reaches the neuromuscular junction, it triggers release of the neurotransmitter acetylcholine, which diffuses across the synaptic cleft and binds with receptors on the motor end plate. They produce their effect at the neuromuscular junction by either depolarizing the motor end plate or competing with acetylcholine for binding sites on the motor end plate. Succinylcholine causes sustained depolarization and prevents repolarization of the motor end plate. www.findarticles.com /p/articles/mi_qa3689/is_200203/ai_n9029637   (1141 words)

Virtual Hospital: Atlas of Microscopic Anatomy: Section 1 - Cells   (Site not responding. Last check: 2007-10-09) The subneural region is seen to better advantage in Plate 117. Axon: Although not shown, nerve fibers lose their myelin sheaths as they approach the motor end plate region. Motor end plate: A well-defined junction of axon terminals on the muscle fiber surface. www.vh.org /adult/provider/anatomy/MicroscopicAnatomy/Section06/Plate06118.html   (255 words)

2740 NERVOUS SYSTEM HISTOLOGY   (Site not responding. Last check: 2007-10-09) Skeletal muscles (C) are stimulated by nerve impulses carried by motor neurons. An axon (A) that carries the impulse away from the nerve body ends in little pads on muscle fibers called motor end plates (B). D is the anterior horn composed of the cell bodies of motor neurons. www.unomaha.edu /hpa/2740nervehistology.html   (259 words)

End Plate Note the specialized portions of the sarcolemma (muscle cell membrane) called motor end plates. Although the ends of axons come close to the muscle fibers, they do not actually touch, and it is a chemical signal that bridges the gap between the axon terminal and the motor end plate. This neurotransmitter chemical (acetylcholine) is released from presynaptic vesicles when the nerve impulse reaches the end of the axon. bioweb.uwlax.edu /aplab/Table_of_Contents/Lab_10/End_Plate/end_plate.html   (136 words)

Example: Motor End Plate   (Site not responding. Last check: 2007-10-09) The "bump" on the myofiber in the center of this field is a motor end plate or neuromuscular junction. This is the site of interaction between the nervous system and the musculoskeletal system, and you can think of it as a specialized form of synaptic connection. , an axon) that comes in to form the motor end plate on this fiber. education.vetmed.vt.edu /Curriculum/VM8054/Labs/Lab10/Examples/exmtrplt.htm   (248 words)

kauai.ca - motor court   (Site not responding. Last check: 2007-10-09) CASA of Maryland sued the state Motor Vehicle Administration Tuesday, claiming the MVA has unlawfully denied... ELYRIA -- Claiming the city isn't getting its fair share of the tax revenue from Ford Motor Co.'s Ohio Assembly Plant, Sheffield Lake is suing Sheffield Village, Avon Lake and the Regional Income Tax Authority. The UAW has started talks with Ford Motor Co. on changes to retiree health-care benefits but will conduct a thorough analysis of the automaker before it agrees to any deal, union president Ron Gettelfinger said Wednesday. kauai.ca /motor-court/reference/search   (252 words)

Skeletal Muscle Upon reaching the end of the axon, a nerve impulse (action potential) induces the release of a quantum of acetylcholine vesicles which diffuse across the cleft (i.e. A short time later, acetylcholinesterase, an enzyme present in the motor end-plate, neutralizes the acetylcholine causing membrane repolarization back to the resting state. Experimentally, it is possible to cause a muscle to twitch by shocking it electrically with a pulse of current. www.elon.edu /shouse/physiology/frog/muscle/frogmusc.html   (1904 words)

Evidence of Schwann cell degeneration in the aging mouse motor end-plate region.   (Site not responding. Last check: 2007-10-09) Evidence of Schwann cell degeneration in the aging mouse motor end-plate region. An ultrastructural evaluation was made of the changes encountered in the motor endplates of the gastrocnemius muscle of old mice in comparison with young-adult mice. The lesions described are not specific for the aging process. www.arclab.org /medlineupdates/abstract_4018174.html   (180 words)

[No title]   (Site not responding. Last check: 2007-10-09) Each skeletal muscle fiber is controlled by a nerve cell called motor neuron, through a single neuromuscular junction midway along fiber’s length. Both the synaptic cleft and the motor end plate contain the enzyme acetylcholinesterase (AChE, which breaks down molecules of ACh. The thin filaments at either end of the sarcomere are attached to interconnecting proteins that make up the Z lines. www.ocf.berkeley.edu /~kishang/bio3/MUSCLES.doc   (870 words)

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