How many types of spinal cord tracts / pathways do we have?
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15 Tracts \n1. Fasciculus gracilis (Goll)\n2. Fasciculus cuneatus (Burdach)\n3. Tractus spinocerebellaris dorsalis (Flechsig)\n4. Tractus corticospinalis lateralis\n5. Tractus spinothalamicus lateralis (Edinger)\n6. Tractus spinocerebellaris ventralis (Gowers)\n7. Tractus rubrospinalis\n8. Tractus spinotectalis\n9. Tractus corticospinalis anterior\n10. Tractus olivospinalis\n11. Tractus spinoolivaris\n12. Tractus tectospinalis\n13. Tractus reticulospinalis\n14. Tractus vestibulospinalis\n15. Tractus spinothalamicus anterior\n\nThe EXTRAPYRAMIDAL TRACTS modify cortically initiated impulses to the skeletal muscles. \nThey are distinct from the pyramidal Tracts in that their function is largely UNCONSCIOUS. \nThis means they act AUTOMATICALLY or INVOLUNTARILY. \nThis fact suggests that their functions are not normally subject to conscious modification such as that gained through practice or exercise.\nThe Extrapyramidal System is also PASSIVE. These tracts depend upon input from the brain as well as the skeletal muscles to function properly. \nThey originate in DIFFUSE areas of the central nervous system.\n\n\n\nThe Pyramidal Tract\n\nThis group of fibers carries messages for voluntary motor movement to the lower motor neurons in the brain stem and spinal cord. \n\nApproximately 80% of the cell bodies of the pyramidal tract are located on the precentral gyrus of the frontal lobe, which is also known as the motor strip. Particularly large cells located here whose axons are part of the pyramidal tract are called pyramidal cells. Approximately 20% of the pyramidal tract fibers also originate in the postcentral gyrus of the parietal lobe, in Brodmann's areas 1, 2, and 3. Regardless of the location of their cell bodies, pyramidal tract fibers begin their descent from the cortex as a corona radiata (radiating crown) before forming the internal capsule. \n\nMore at link below...
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Humans are born with 33 separate vertebrae. By adulthood, most have only 24, due to the fusion of the vertebrae in certain parts of the spine during normal development.
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Functional classification There are three functional classes of neurons: afferent neurons, efferent neurons, and interneurons.\n\n    * Afferent neurons convey information from tissues and organs into the central nervous system.\n    * Efferent neurons transmit signals from the central nervous system to the effector cells.\n    * Interneurons connect neurons within specific regions of the central nervous system.\n\nAfferent and efferent can also refer to neurons which convey information from one region of the brain to another.\n\nStructural classification Most neurons can be anatomically characterized into one of three categories:\n\n    * Unipolar or Pseudounipolar- dendrite and axon emerging from same process.\n    * Bipolar - single axon and single dendrite on opposite ends of the soma.\n    * Multipolar - more than two dendrites\n          o Golgi I- Neurons with long-projecting axonal processes.\n          o Golgi II- Neurons whose axonal process projects locally.
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We all have different body types - some are ectomorphs, mesomorphs, and endomorphs.
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Definition\nSpina Bifida means cleft spine, which is an incomplete closure in the spinal column. In general, the three types of spina bifida (from mild to severe) are:\n\n1. Spina Bifida Occulta: There is an opening in one or more of the vertebrae (bones) of the spinal column without apparent damage to the spinal cord.\n\n2. Meningocele: The meninges, or protective covering around the spinal cord, has pushed out through the opening in the vertebrae in a sac called the "meningocele." However, the spinal cord remains intact. This form can be repaired with little or no damage to the nerve pathways.\n\n3. Myelomeningocele: This is the most severe form of spina bifida, in which a portion of the spinal cord itself protrudes through the back. In some cases, sacs are covered with skin; in others, tissue and nerves are exposed. Generally, people use the terms "spina bifida" and "myelomeningocele" interchangeably.
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http://scholar.google.com/scholar?q=penetrating%20injuries%20of%20the%20vertebral%20column"?&hl=en&lr=\n\nThe above link has several scholarly websites on the subject.\n\n\nVertebral column\nFrom Wikipedia, the free encyclopedia\nJump to: navigation, search\n \nThe vertebral column seen from the side \nDifferent regions (curvatures) of the vertebral columnIn human anatomy, the vertebral column (backbone or spine) is a column of vertebrae situated in the dorsal aspect of the abdomen. It houses the spinal cord in its spinal canal.\n\nCurves\nViewed laterally the vertebral column presents several curves, which correspond to the different regions of the column, and are called cervical, thoracic, lumbar, and pelvic. The cervical curve, convex forward, begins at the apex of the odontoid (tooth-like) process, and ends at the middle of the second thoracic vertebra; it is the least marked of all the curves. The thoracic curve, concave forward, begins at the middle of the second and ends at the middle of the twelfth thoracic vertebra. Its most prominent point behind corresponds to the spinous process of the seventh thoracic vertebra. The lumbar curve is more marked in the female than in the male; it begins at the middle of the last thoracic vertebra, and ends at the sacrovertebral angle. It is convex anteriorly, the convexity of the lower three vertebrae being much greater than that of the upper two. The pelvic curve begins at the sacrovertebral articulation, and ends at the point of the coccyx; its concavity is directed downward and forward. The thoracic and pelvic curves are termed primary curves, because they alone are present during fetal life. In the early embryo, the vertebral column is C-shaped, and the cervical and lumbar curvatures are not yet present in a newborn infant. The cervical and lumbar curves are compensatory or secondary, and are developed after birth, the former when the child is able to hold up its head (at three or four months), and to sit upright (at nine months), the latter at twelve or eighteen months, when the child begins to walk.\n\nThe vertebral column also has a slight lateral curvature, the convexity of which is directed toward the right side. This may be produced by muscular action, most persons using the right arm in preference to the left, especially in making long-continued efforts, when the body is curved to the right side. In support of this explanation it has been found that in one or two individuals who were left-handed, the convexity was to the left side. This curvature is regarded by others as being produced by the aortic arch and upper part of the descending thoracic aorta – a view which is supported by the fact that in cases where the viscera are transposed and the aorta is on the right side, the convexity of the curve is directed to the left side.\n\n\nSurfaces\n\nAnterior surface\nWhen viewed from in front, the width of the bodies of the vertebrae is seen to increase from the second cervical to the first thoracic; there is then a slight diminution in the next three vertebrae; below this there is again a gradual and progressive increase in width as low as the sacrovertebral angle. From this point there is a rapid diminution, to the apex of the coccyx.\n\n\nPosterior surface\nThe posterior surface of the vertebral column presents in the median line the spinous processes. In the cervical region (with the exception of the second and seventh vertebrae) these are short and horizontal, with bifid extremities. In the upper part of the thoracic region they are directed obliquely downward; in the middle they are almost vertical, and in the lower part they are nearly horizontal. In the lumbar region they are nearly horizontal. The spinous processes are separated by considerable intervals in the lumbar region, by narrower intervals in the neck, and are closely approximated in the middle of the thoracic region. Occasionally one of these processes deviates a little from the median line — a fact t
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are you sure that bump isn't the end of your spinal cord? ;)
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5 different types:\n\nAdult stem cells\nEmbryonic stem cells\nParthenogenesis\nStem cells from cord blood or amniotic fluid\nSomatic cell nuclear transfer cloning
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Most likely it means a variety of things.  A neuron is a pathway - in whatever subject you are delving in.  It could be the motor neuron from the spine that runs through the cerevbral cortex and into the appropriate site in the brain; the motor is as all motors- it is a source of power - could be a motor of any type, but in this case one is referring to the nerve that causes the firing impulse along the neural pathway to the brain that causes a muscle to contract.  \nThe other is probably speaking of a specific motor neuron - there are billions in the body.
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Tethered spinal cords are a group of complicated developmental malformations of the spinal cord.  Go to the following site for more information, including signs and symptoms and treatments.
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DEFINED?\n\nI'M  NOT  AN  EXPERT  BUT,  I  THINK\n\n1  INTERNAL  UTERINE (UTERUS)  \n2  EXTERNAL  CLITORIOUS  SP?\n3  COMBINATION  OF  THE  TWO  ABOVE\n4  G  SPOT  \n\nI  THINK  FOUR'S  A  CROCK\n\nI'VE  HEARD  ABOUT  THE  "G"  SPOT  BUNDLE  OF  NERVES  LOCATED  INTERNALLY  BEHIND  THE  PUBIC  MOUND\n\nOF  COURSE,  I'M  SURE  THERE  ARE  PEOPLE  OUT THERE  HAVING  MORE  FUN  THAN  ME    MULTIPLE  "O"  LOL
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I thought there were four unless you dont count the core....\norder from outer to inner:\ncrust\nmantle\ncore\ninner core\nthat what you looking for?
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thorasic, lumbar and cervical
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Check out the links below that discuss spinal cord injuries & pregnancy:
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The thecal sac is the overall name for the covering of your spinal cord andthe nerves where they leave your spinal cord. The first part of your report says that you have a slipped disc (disc protusion) which is pressing in a forwards/backwards (anterior/posterior) manner on the spinal cord. \nThe second part says you have another slipped disc pressing (effaced means touching/pressing on) on the nerve as it leaves your spinal cord.\n\nNeither of these is really dangerous, just painful. You probably need to see a back specialist though to sort out treatment.
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I'm not quite sure what you are asking, but I think the answer you want is that each ganglion contains the cell bodies of the sensory neurones.\nUnipolar motor neurones have their cell bodies within the spinal cord.