Anatomical language, planes and imaging
Introduced| English | Meaning |
|---|---|
| anatomical position | anatomical position |
| proximal | proximal |
| distal | distal |
| sagittal plane | A vertical plane dividing the body into left and right parts. |
| coronal plane | A vertical plane dividing the body into front and back parts. |
| transverse plane | A horizontal plane dividing the body into upper and lower parts. |
Whose left?
- A "mass on the left" means the patient's left, always. Anatomy has a precise language because vague words cause real harm.
- Learn the grammar once, and every later description, scan and operation note becomes clear.
Directions
- Every direction assumes the anatomical position 解剖学姿势: standing, facing you, palms forward. Superior/inferior is up/down; anterior/posterior is front/back.
- Medial/lateral is towards/away from the midline. Proximal 近侧 and distal 远侧 are nearer to and further from where a limb attaches.
Match each pair of terms to what it describes.
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Each pair is relative to the anatomical position, so it means the same thing whatever the patient's posture.
Three planes
- The sagittal plane 矢状面 runs front to back and splits left from right. The coronal plane 冠状面 runs side to side and splits front from back.
- The transverse plane 横断面 is a horizontal cross-section that splits upper from lower. Every scan you will read is cut in one of these.
Which plane splits the body into left and right parts?
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The sagittal plane runs front to back, so it separates left from right. Coronal separates front from back; transverse, top from bottom.
How a CT slice is shown
- A CT or MRI report names the plane ("axial T2", "coronal CT") and the side. An axial slice is shown as if you stand at the patient's feet looking up.
- So the patient's right appears on the left of the image. Applied every time, this one rule lets two readers agree about a lesion without seeing the patient.
On a standard axial CT slice, where does the patient's right side appear?
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Axial slices are viewed as if from the patient's feet, so the patient's right is on the image's left. The convention is the same everywhere.
Worked example: the direction drill
- The elbow is distal to the shoulder and proximal to the wrist. The sternum is anterior to the heart, which is anterior to the oesophagus.
- Drill these until they are automatic: each pair replaces a whole sentence of description.
Put these chest structures in order from anterior to posterior.
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The heart sits right behind the sternum, the oesophagus runs behind the heart, and the spine is at the back.
Worked example: naming the site
- (Fictional vignette) A tension pneumothorax is relieved with a needle at "left, second intercostal space, mid-clavicular line".
- The grammar is the safety system: side first, a landmark in two directions, and depth counted by rib spaces, not centimetres.
In a clinical note, "left second intercostal space" means the left side as the doctor faces the patient.
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Sides always mean the patient's own left and right, whoever is looking.
Three common slips
- Observer's side for patient's side. On an axial image, the patient's right is on your left.
- Mixing reference points. Medial/lateral are measured from the midline; proximal/distal from where the limb attaches.
- "Coronal means from the top." The coronal plane is vertical, parallel to the coronal suture, and splits front from back.
A coronal MRI slice of the head passes through both ears. Which parts of the head does it separate?
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The coronal plane is vertical and runs ear to ear, splitting the body into front and back parts.
Recap
- All directions assume the anatomical position.
- Sagittal splits left/right, coronal splits front/back, transverse splits top/bottom.
- On axial images, the patient's right is on the viewer's left.