Imagine slicing a loaf of bread in different directions. The object stays the same, but each slice shows a different shape. Body sections work similarly.
Read one idea at a time1 / 7
Plane / section
A plane is an imaginary flat surface; a section is the view through that surface.
For example
An imaging scan can show a section without physically cutting the body.
Read all notes for this section
Plane / section
A plane is an imaginary flat surface; a section is the view through that surface. An imaging scan can show a section without physically cutting the body.
Sagittal
A plane that separates right and left portions. The median sagittal plane follows the exact midline.
Coronal
A plane that separates front and back portions. Also called frontal. A coronal chest section can show both lungs side by side.
Transverse
A plane that separates upper and lower portions. Also called axial. A transverse abdominal section is a cross-section through the trunk.
A plane is a way to imagine a slice
Imagine a flat sheet passing through the body. That sheet represents a plane. A section is a slice or image along that plane. The plane tells you how the body was divided, which helps you understand what the image can show.
Three main ways to divide the body
A sagittal plane separates right and left portions; the median plane is the sagittal plane exactly in the middle. A coronal plane separates front and back portions. A transverse plane separates upper and lower portions. Coronal is also called frontal; transverse is often called axial.
Check the view before naming a structure
A tube can look round in a cross-section and long in a lengthwise section. Its shape on the page depends on the cut. Check the plane, the level of the slice and the right/left markers first. Do not assume the left of the screen is the person’s left.
Explore the illustration
Look at the whole view first. Then select one label and connect it to the idea you just read.
Three ways to section the body
The translucent sheets represent planes, not anatomical structures.
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01 / 3 Median sagittal plane
A plane is an imaginary flat surface. The median sagittal plane passes through the midline and divides the body into equal right and left halves. Other sagittal planes run parallel to it.
Guided anatomy tour: each step identifies one structure and explains its relationship to the next. The highlight moves; the anatomy stays still. Reduced motion is enabled. Use the arrows to study one step at a time, or choose Play.
Median sagittal plane
A vertical plane through the midline separates equal right and left halves.
Adapted for this lesson: labels removed, artwork cropped or recoloured, and interactive teaching overlays added. Adapted artwork retains its source licence.
Go deeper
In-depth reading
Follow this example step by step, then try explaining it yourself. The extra reading is optional: you can return to it after exploring the illustration.
Worked example: one tube, three appearances
Imagine a straight drinking straw as a simple model of a tube. Cut straight across it: the opening looks circular. This is a cross-section relative to the straw.
Cut along its length instead: the inside looks like a long channel. Cut at a slant and the opening looks oval. A slanted cut is called oblique. The object has not changed; the cutting direction has.
Apply this to a blood vessel in a body image. Before deciding that two shapes are different structures, ask whether the same vessel has been cut at different angles or levels. One image is only one view of a three-dimensional body.
Explain it yourself
Which plane separates anterior and posterior portions?
Show the explanation
The coronal, or frontal, plane. A sagittal plane separates right and left portions; a transverse plane separates upper and lower portions.
More detail — when you are ready
These notes expand the mechanisms and vocabulary. Read one topic at a time and find the structures in the illustration.
Plane, section and viewing direction
A plane is an imagined reference surface; a section is a slice made along it. A median section passes through the midline and separates equal right and left halves.
Other sagittal sections also separate right and left portions, but not necessarily equal halves. Coronal sections separate anterior and posterior portions.
Transverse sections separate superior and inferior portions. Oblique sections meet the principal planes at an angle.
“Longitudinal” means along a structure’s length and must be interpreted relative to that structure, not automatically the whole body.
Why a structure changes shape between images
A tube cut across its long axis may look circular; a lengthwise section can show an elongated channel. An oblique section may look oval.
These are different views of one structure, not necessarily different organs. Moving a transverse slice from chest to abdomen changes which structures are intersected.
A single slice cannot display every part of a winding organ. Identify level and plane before using shape as evidence of identity, and compare adjacent slices when available.
Worked orientation sequence
For an axial image, first find the right/left labels. Then locate anterior and posterior landmarks such as the abdominal wall and vertebral column.
Only then identify organs. Many clinical transverse images are viewed from the feet, so the person’s right appears on the image’s left, but the actual markers govern interpretation.
A rotated screen does not change anatomical relationships. If a marker is missing, describe the uncertainty rather than assigning a side from screen position alone.
Further reading — optional
Free external resources in English. Internet connection required to open the links. Choose the topic you want to explore; these readings are not required to complete the section.
Use the labelled figures to practise position, planes and body regions. Read the part that matches this section first.
Practice progress is saved on this device for the current learner.
Sources and illustration notes
Bilingual teaching notes organised from your supplied anatomy reference pages. Medical SVG artwork is credited beneath each illustration; guided sequences and process overlays support slow, step-by-step study. Anatomy and translation await expert review.
