Introduction to Medical Terminology
Medical terminology is a specialized language used by healthcare professionals worldwide. Like all languages, it follows systematic rules. Most medical terms derive from Greek and Latin roots, which means once you learn these word elements, you can decode thousands of medical terms. This foundational lesson introduces the anatomy of medical words and the human body's organizational levels.
Learning Objectives
- 1Identify the four word elements: root, prefix, suffix, and combining form
- 2Apply rules for building and analyzing medical terms
- 3Describe the body's structural organization levels
- 4Identify body planes, directional terms, and body cavities
- 5Differentiate between signs and symptoms
1Word Elements
Medical terms are constructed from four basic word elements:
Word Root (WR): The foundation of the term; contains the core meaning. Example: *cardi* (heart).
Combining Form (CF): A word root with a combining vowel (usually 'o') attached. Example: *cardi/o*. The combining vowel makes pronunciation easier when adding a suffix that begins with a consonant.
Prefix: A word element attached to the beginning of a term that modifies its meaning. Example: *tachy-* (rapid). Not all terms have a prefix.
Suffix: A word element attached to the end of a term that often indicates a procedure, condition, or disease. Example: *-itis* (inflammation). All medical terms have a suffix.
2Rules for Building Medical Terms
Rule 1: When the suffix begins with a vowel, drop the combining vowel from the combining form. Example: *gastr/o* + *-itis* = gastritis (not gastrOitis).
Rule 2: When the suffix begins with a consonant, keep the combining vowel. Example: *gastr/o* + *-scope* = gastroscope.
Rule 3: When a word root is joined to another word root, a combining vowel is usually used. Example: *gastr/o* + *enter/o* + *-logy* = gastroenterology.
3Body Organization
The human body is organized in increasing complexity:
Chemical Level → Cellular Level → Tissue Level → Organ Level → System Level → Organism Level
There are 11 major body systems: integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, and reproductive.
4Directional Terms and Body Planes
Directional Terms:
Body Planes (imaginary flat surfaces):
Body Cavities:
Clinical Connections
- ►Medical terminology enables precise communication among healthcare providers globally
- ►Incorrect medical terminology can lead to dangerous medication or treatment errors
- ►Understanding word elements allows decoding of unfamiliar terms encountered in practice