Landmark Mapping
Landmark Mapping - Related Videos
04:47
Systematic Bronchoscopy: the Four Landmarks Approach
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Cited by 4 •
2023
Here, we present a protocol to navigate the bronchial maze in a structured manner, splitting the bronchoscopy into a stepwise approach-the four landmarks approach.
14:13
Coordinate Mapping of Hyolaryngeal Mechanics in Swallowing
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Cited by 34 •
2014
Coordinate mapping is a method of documenting salient features of hyolaryngeal biomechanics in the pharyngeal phase of swallowing. This methodology uses image analysis software to record coordinates of anatomical landmarks. These coordinates are imported into an excel macro and translated into kinematic variables of interest useful in dysphagia research.
05:22
Systematic Endobronchial Ultrasound - The Six Landmarks Approach
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Cited by 1 •
2023
Endobronchial ultrasound-guided sampling using transbronchial needle aspiration plays a key role in staging and diagnosing lung cancer. We propose a systematic stepwise approach dividing the procedure into six landmarks that should be taught to new operators.
06:58
Fate Mapping
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2023
Fate mapping is a technique used to understand how embryonic cells divide, differentiate, and migrate during development. In classic fate mapping experiments, cells in different areas of an embryo are labeled with a chemical dye and then tracked to determine which tissues or structures they form. Technological improvements now allow for individual cells to be marked and traced throughout embryonic development and adulthood. This video reviews the concepts behind fate mapping, and then details a...
11:03
Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
FAQs
A coordinate system makes landmark measurements comparable across specimens or images. After reference points are recorded, distances, angles, and other spatial relationships can be calculated rather than judged visually. The resulting measurements describe how locations change relative to one another, allowing researchers to separate overall differences in organization from particular changes in shape or position.
Landmark selection determines whether the measurements represent meaningful biology. Useful points must be consistently recognizable, such as a boundary, joint, or cell group, so that equivalent locations can be compared across samples. If a feature shifts, disappears, or is difficult to identify, the comparison may reflect inconsistent placement rather than a genuine difference in anatomy, development, or condition.
Unlike a purely descriptive inspection, landmark mapping produces a spatial record that can be examined quantitatively. This is especially useful when two structures appear similar but differ in proportions, angles, or local organization. Comparing those measurements across individuals or conditions can reveal variation that visual summaries may overlook, while retaining a direct connection to the underlying anatomical or tissue features.
A typical workflow begins by selecting repeatable reference features, documenting them with an imaging tool when appropriate, and assigning their positions within a coordinate system. Researchers then calculate relevant distances, angles, or relationships and compare the results among specimens, stages, or conditions. Careful matching of corresponding landmarks is essential because it determines whether the final comparison is biologically interpretable.
Researchers can apply the method to growth and development by tracking how landmarks move or change in relation to one another over time. The same measurements support comparisons among individuals and experimental conditions, helping identify structural variation or changes associated with disease. Because the output is spatially explicit, it can connect visible anatomical organization with a measurable biological pattern.
In evolutionary biology, landmark mapping helps compare anatomical form among organisms by documenting shared reference features and their spatial relationships. Patterns of distance, angle, or organization can provide evidence for similarities and differences in structure, while developmental studies can examine how those patterns change across stages. Together, these uses make the approach relevant to variation among individuals and broader relationships among forms.