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Parasympathetic Division
...  abdomen or in the head. Preganglionic neurons are produced in the spinal column and the brain. Majority of the neurons in the parasympathetic division originate from the midbrain, the pons and the medulla oblongata. The effects of the action of the parasympathetic division are opposite to that of sympathetic, and the process is “rest and digest” instead of “fight or  ...

Blood Supply to the Brain
...  neck. For the blood supply to enter the brain, these arteries pass through the foramen magnum. This is an opening at the base of the skull where the spinal cord merges with the brain region of the medulla oblongata. The arteries are conjoined once they have penetrated the cranium to form the basilar artery. This artery, in turn, serves as the seed where two posterior cerebral arteries are  ...

Medulla Oblongata
...  medulla oblongata is the undermost portion in the stem of the brain, and is measuring approximately 3 centimeters long. Its structure is bulbous, and it is attached anteriorly in the pons. It is also connected posteriorly in the spinal cord. medulla oblongata is situated at the same level as with foramen magnum. When it is viewed externally, it would look similar to the spinal cord except for  ...

Mesencephalon
...  together with its corresponding tracts is located within the system of the brain. This section of the brain is vital, because it is attached to the spinal cord. The midbrain, the pons and the medulla oblongata are also found there. What is Inside the Mesencephalon? The mesencephalon, or the midbrain has these parts inside it: corpora quadrigemina, red nucleus, the cerebral peduncles and  ...

Pons
...  metencephalon then controls the skeletal muscle contraction. The distinct characteristic of the pons is its circular bulge which lies on the brain’s inferior side. It could be seen between the medulla oblongata and the midbrain. It is created in through tracts of white colored fiber in two principle directions. One, it transversely extends throughout the middle part of cerebellar  ...

Spinal Cord
...  the ascending and descending tracts. Its nerve fibers are myelinated, and names according to its location. Fibers in these tracts remain on the same side or cross over the spinal cord (and even in medulla oblongata). This crossing over is called decussation. Take for instance corticospinal tracts. They continuously descend in the absence of a synaptic interruption. The fibers for these tracts  ...


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