00:00 / 00:00
Introduction to anatomy
Figure 1: A. Anatomical position. B. Anatomical planes.
Figure 2: Sections of the limbs. A. Longitudinal section. B. Oblique section. C. Transverse section.
Figure 3: Anatomical terms of relationship and comparison.
Figure 4: Anatomical terms of laterality.
When someone talks to us, we’re only able to understand them if we know their language. Well… the same thing goes for anatomy!
To study anatomy and communicate among peers, we have to use specialized terminology that helps us describe the structures of the human body, where exactly they’re located, and their relationship to one another.
If I tell you to look at the right-most finger of your hand - which one will it be? Your pinkie? Your thumb? It will depend on the position of your hand and whether you're looking at the back or the palm. This is why all anatomical descriptions are expressed in relation to one consistent position to eliminate any ambiguity.
Anatomical position is the position that is globally adopted for anatomical and medical descriptions of the human body. Now, let’s describe the position the body is in when we refer to anatomical position.
When a person is in the anatomical position, they are standing straight with their legs close together, their feet parallel to one another, toes directed forward, their arms are down at their sides with the palms of their hands facing forward, and they are keeping their head up and gazing straight forward. All descriptions of the body refer to the position shown here.
Now, if we’re looking at someone in anatomical position, there are four imaginary planes that intersect the body to help us with anatomical descriptions.
First, we have the median plane, which is an imaginary vertical plane going through the body’s midline, over structures such as the nose and belly button, separating the body into right and left halves.
Second, are sagittal planes, which are also vertical planes, but aren't fixed, meaning that they could be placed anywhere parallel to the median plane, dividing the body into uneven left and right parts. You might also hear the term paramedian plane, which describes a sagittal plane that is near the median plane.
Next we have frontal planes, also known as coronal planes. These imaginary planes are also vertical, but perpendicular to the sagittal and median planes, meaning they go from left to right, separating the body into a front portion and a back portion.
Copyright © 2023 Elsevier, its licensors, and contributors. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Cookies are used by this site.
USMLE® is a joint program of the Federation of State Medical Boards (FSMB) and the National Board of Medical Examiners (NBME). COMLEX-USA® is a registered trademark of The National Board of Osteopathic Medical Examiners, Inc. NCLEX-RN® is a registered trademark of the National Council of State Boards of Nursing, Inc. Test names and other trademarks are the property of the respective trademark holders. None of the trademark holders are endorsed by nor affiliated with Osmosis or this website.