roll,pitch yawrobotics

Coarse and Fine Focus knobs are used to focus the microscope. Increasingly, they are coaxial knobs - that is to say they are built on the same axis with the fine focus knob on the outside. Coaxial focus knobs are more convenient since the viewer does not have to grope for a different knob.

Nosepiece houses the objectives. The objectives are exposed and are mounted on a rotating turret so that different objectives can be conveniently selected. Standard objectives include 4x, 10x, 40x and 100x although different power objectives are available.

Illuminator is the light source for a microscope, typically located in the base of the microscope. Most light microscopes use low voltage, halogen bulbs with continuous variable lighting control located within the base.

A high power or compound microscope achieves higher levels of magnification than a stereo or low power microscope. It is used to view smaller specimens such as cell structures which cannot be seen at lower levels of magnification. Essentially, a compound microscope consists of structural and optical components. However, within these two basic systems, there are some essential components that every microscopist should know and understand. These key microscope parts are illustrated and explained below.

Pitch yaw rollXYZ

The best way to visualize the movement pattern of the sacrum is to consider gait, in which sacral movement reciprocates with the ilia. In order to accommodate the two opposing iliac movements, the articular surfaces are shaped like an airplane rotor, imparting a twisting motion [1-4]. However, instead of the rotor spinning, the central body rotates, as the sacrum pivots about the prescribed paths formed into the articular surfaces of the sacrum and ilia at the sacroiliac joints, one on each side. During right nutation, the right side of the sacral base pivots anteriorly and inferiorly as the right ilium moves posteriorly and inferiorly; at the same time, the left side of the sacral base pivots posteriorly and superiorly as the left ilium moves anteriorly and superiorly. As the two ilia reverse movement, the sacrum pivots accordingly [5, 6].

Pitch roll

Iris Diaphragm controls the amount of light reaching the specimen. It is located above the condenser and below the stage. Most high quality microscopes include an Abbe condenser with an iris diaphragm. Combined, they control both the focus and quantity of light applied to the specimen.

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The attachment of the wings to the body of the plane is comparable to the sacroiliac joint. Unlike the wings of a plane, which float freely in an open system, allowing a firm attachment to the body of the plane, the innominates are part of a closed system, which necessitates a slight amount of flexibility at their attachment to the sacrum, which is provided by the ligaments. Too much laxity will impede control and too little motion will reduce the normal pumping mechanism of the joint; either will be detrimental to stability.

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Pitch yaw rolldiagram

Eyepiece or Ocular is what you look through at the top of the microscope. Typically, standard eyepieces have a magnifying power of 10x. Optional eyepieces of varying powers are available, typically from 5x-30x.

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Pitch yaw rollcar

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Pitch Yaw rollface

Sacral motion can be compared to that of an airplane undergoing pitch, roll, and yaw, where sacral flexion/extension is comparable to pitch, sacral rotation is comparable to roll, and sacral lateral flexion is comparable to yaw. The combined movement around these three axes, each centered in the body of the sacrum, represents sacral motion.

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Stage Clips are used when there is no mechanical stage. The viewer is required to move the slide manually to view different sections of the specimen.

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Eyepiece Tube holds the eyepieces in place above the objective lens. Binocular microscope heads typically incorporate a diopter adjustment ring that allows for the possible inconsistencies of our eyesight in one or both eyes. The monocular (single eye usage) microscope does not need a diopter. Binocular microscopes also swivel (Interpupillary Adjustment) to allow for different distances between the eyes of different individuals.

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Condenser is used to collect and focus the light from the illuminator on to the specimen. It is located under the stage often in conjunction with an iris diaphragm.

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Objective Lenses are the primary optical lenses on a microscope. They range from 4x-100x and typically, include, three, four or five on lens on most microscopes. Objectives can be forward or rear-facing.

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Stage is where the specimen to be viewed is placed. A mechanical stage is used when working at higher magnifications where delicate movements of the specimen slide are required.

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