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The thumb (pollex) is lateral to the digits.

Lateral describes the side or direction toward the side of the body.

Inferior (or caudal) describes a position below or lower than another part of the body proper near or toward the tail (in humans, the coccyx, or lowest part of the spinal column).

Superior (or cranial) describes a position above or higher than another part of the body proper.

The popliteus is posterior to the patella.

Posterior (or dorsal) Describes the back or direction toward the back of the body.

Anterior (or ventral) Describes the front or direction toward the front of the body.

Commit these terms to memory to avoid confusion when you are studying or describing the locations of particular body parts. For instance, an anatomist might describe one band of tissue as “inferior to” another or a physician might describe a tumor as “superficial to” a deeper body structure. These terms are essential for describing the relative locations of different body structures. Directional TermsĬertain directional anatomical terms appear throughout this and any other anatomy textbook ( Figure 1.13). You will be able to describe the body’s regions using the terms from the figure. Notice that the term “brachium” or “arm” is reserved for the “upper arm” and “antebrachium” or “forearm” is used rather than “lower arm.” Similarly, “femur” or “thigh” is correct, and “leg” or “crus” is reserved for the portion of the lower limb between the knee and the ankle. The human body’s numerous regions have specific terms to help increase precision (see Figure 1.12).

These terms are sometimes used in describing the position of the body during specific physical examinations or surgical procedures. Prone describes a face-down orientation, and supine describes a face up orientation. The regions of the body are labeled in boldface.Ī body that is lying down is described as either prone or supine. The term “anterior” would be used even if the hand were palm down on a table.įigure 1.12 Regions of the Human Body The human body is shown in anatomical position in an (a) anterior view and a (b) posterior view. For example, a scar in the “anterior (front) carpal (wrist) region” would be present on the palm side of the wrist. It does not matter how the body being described is oriented, the terms are used as if it is in anatomical position. Using this standard position reduces confusion. The upper limbs are held out to each side, and the palms of the hands face forward as illustrated in Figure 1.12. Just as maps are normally oriented with north at the top, the standard body “map,” or anatomical position, is that of the body standing upright, with the feet at shoulder width and parallel, toes forward. To further increase precision, anatomists standardize the way in which they view the body. For example, in the disorder hypertension, the prefix “hyper-” means “high” or “over,” and the root word “tension” refers to pressure, so the word “hypertension” refers to abnormally high blood pressure. The root of a term often refers to an organ, tissue, or condition, whereas the prefix or suffix often describes the root. Because these languages are no longer used in everyday conversation, the meaning of their words does not change.Īnatomical terms are made up of roots, prefixes, and suffixes. Anatomical terms derive from ancient Greek and Latin words. For example, is a scar “above the wrist” located on the forearm two or three inches away from the hand? Or is it at the base of the hand? Is it on the palm-side or back-side? By using precise anatomical terminology, we eliminate ambiguity. However, the purpose of this language is not to confuse, but rather to increase precision and reduce medical errors. Describe serous membrane and explain its functionĪnatomists and health care providers use terminology that can be bewildering to the uninitiated.Distinguish between the posterior (dorsal) and the anterior (ventral) body cavities, identifying their subdivisions and representative organs found in each.Identify three planes most commonly used in the study of anatomy.Describe the human body using directional and regional terms.

By the end of this section, you will be able to: