The Language of Anatomy
Planes, directions, and the words on every exam
Before you can describe an injury you have to describe a body. Anatomical language exists so that "it hurts here" becomes something a clinician two states away can picture exactly.
The big idea
Every directional term is read from the patient's point of view, from anatomical position — never from yours. Their left hand is on your right.
Everything starts from anatomical position
Anatomical position is the agreed-upon starting pose: standing upright, feet slightly apart and flat on the floor, arms at the sides, palms facing forward, head and eyes facing straight ahead. Every direction word in medicine assumes the body is in this position, no matter how the person is actually standing.
This matters more than it sounds. In anatomical position the palm faces forward, so the radius is on the lateral (thumb) side of the forearm. Flip the hand over and the bones cross, but the naming does not change — the radius is still described as lateral.
Three planes cut the body
A sagittal plane divides the body into left and right. Movement in this plane is forward and backward: a biceps curl, a squat, a running stride.
A frontal (or coronal) plane divides the body into front and back. Movement in this plane is side to side: a jumping jack, a lateral shuffle.
A transverse plane divides the body into top and bottom. Movement in this plane is rotational: a golf swing, a pitcher throwing, a defender turning to run.
Nearly every sport skill is a blend of all three. Naming the dominant plane is how coaches and clinicians decide which motions to train — and which to protect after an injury.
Directional terms come in pairs
Learn these as opposites and they stop being memorization.
- Anterior / Posterior
- Toward the front of the body / toward the back.
- Superior / Inferior
- Above, toward the head / below, toward the feet.
- Medial / Lateral
- Toward the midline of the body / away from the midline. The big toe is medial; the pinky toe is lateral.
- Proximal / Distal
- Closer to the trunk / farther from it. Used for limbs: the knee is distal to the hip and proximal to the ankle.
- Superficial / Deep
- Closer to the surface of the skin / farther beneath it.
- Bilateral / Unilateral
- Affecting both sides / affecting one side only.
Movement words you will use every day
Flexion decreases the angle at a joint; extension increases it. Abduction moves a limb away from the midline; adduction brings it back — remember that adduction adds it to the body.
At the forearm, pronation turns the palm down and supination turns the palm up. A useful trick: you can carry a bowl of soup in a supinated hand.
At the ankle, dorsiflexion pulls the toes up toward the shin and plantarflexion points them down. Inversion turns the sole inward and eversion turns it outward — and inversion is the mechanism behind the overwhelming majority of ankle sprains.
See it in the book
These pages of the Sports Medicine Coloring Book draw out what you just read. Tap any one to look closer.
Terms from this lesson
- Anatomical position
- Standing, facing forward, arms at sides, palms forward. The reference pose for all directional terms.
- Midline
- An imaginary vertical line splitting the body into equal left and right halves.
- Prone
- Lying face down.
- Supine
- Lying face up.
- Circumduction
- A circular movement combining flexion, abduction, extension, and adduction — an arm drawing a cone.
Check yourself
Answer out loud before you open the card. Recall is what makes it stick.
Classroom activity
Directions-only relay
Partner students back to back. One holds a card showing a body position; without naming any body part in plain English, they describe it using only anatomical terms ("right shoulder abducted to ninety degrees, elbow flexed, forearm pronated"). The partner has to assume the position. Swap and repeat. Students discover fast that vague language produces wrong answers — which is the whole reason the vocabulary exists.