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During systole, the two ventricles develop pressure and eject blood into the pulmonary artery and aorta. At this time the AV valves are closed and the semilunar valves are open. The semilunar valves are closed and the AV valves are open during diastole. What happens when the semilunar valves areRead More →

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The Gasserian or trigeminal ganglion is located on the anterior surface of the petrous bone in the middle fossa of the skull. The afferent sensory trigeminal fibers originate from their cell bodies in the Gasserian ganglion, enter the lateral pons, and course in a dorsomedial direction. How many people haveRead More →