Anatomy and Physiology: Anatomical Position and Directional Terms

For those of you who have taken an A&P course (or are taking one right now), you know that before you get to learning about the body you need to learn how to talk about the body.

Most A&P courses begin with positions and directionals. I’m going to give you the rundown. Stay tuned for part two, featuring planes and cavities!
 

Position Is Everything: Anatomical Position

How many of you have used our apps or at least seen the models and thought, “Boy, that body looks awfully stiff in that one position all the time”?

Which, okay, is true. But there’s a reason our 3D body models (I affectionately call them Brenda and Paul) look stiff as a board—it’s the position in which we study the body.

Anatomical position is the description of any region or part of the body in a specific stance. In the anatomical position, the body is upright, directly facing the observer, feet flat and directed forward. The upper limbs are at the body’s sides with the palms facing forward.

Like so:

anatomical-position

You’ve probably seen all sorts of pictures of the body in your A&P textbooks that look like this. In my college A&P text, right there in the first few pages, every body system was shown in anatomical position. This stance should be very familiar to you. If not, it will be by the time you’re through your first two weeks of A&P.

If the anatomical position is placed face-down, it is in the prone position.

anatomical-position-direction-prone

If the anatomical position is placed face-up, it is in the supine position.

anatomical-position-direction-supine

 

Up, Down, Side-to-Side: Directional Terms

Imagine that when you’re studying a (correctly anatomically positioned) body you’re looking at a map. Like you use the cardinal directions to explain the location of certain regions (north, northwest, southeast, etc.), you use directional terms to describe the regions of the body.

Here are some commonly used directional terms:

Anterior

At or near the front of the body (front view)

Posterior

At or near the back of the body (back view)

Midline

An imaginary vertical line that divides the body equally (right down the middle)

Lateral

Farther from midline (side view)

Medial

Nearer to midline (side view)

Superior

Toward the head/upper part of a structure (bird’s-eye view, looking down)

Inferior

Away from the head/lower part of a structure (bottom view, looking up)

Superficial

Close to the surface of the body

Deep

Away from the surface of the body

Proximal

Nearer to the origination of a structure

Distal

Farther from the origination of a structure

 

In many instances, these terms can be paired. For example, a posterosuperior view combines the posterior and superior, giving us a view in which we are looking down at the back of the body, like so:

anatomical-position-direction-posterosuperior-anatomy-physiology

With me so far? No? Okay, let’s do a practice one. Don’t be afraid to refer to the chart before you answer.

anterosuperior-view-anatomical-position

If you answered B) anterosuperior, you’re right! Remember, the anterior is the front view and the superior is the top view—combine the two and you’ve got yourself a bird’s-eye view of the front of the body.

 

And there you have it: a crash course in anatomical position and directional terms. We have all this content in a quick ebook  you can download.

Stay tuned for part two on planes and cavities!


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