Medical Terminology: Prefixes, Suffixes, and Root Words in Anatomy & Physiology

Medical Terminology in Anatomy & Physiology

Understanding medical terminology is essential for success in Anatomy & Physiology. Many terms are constructed from prefixes, suffixes, and root words, each contributing to the overall meaning. Mastery of these components aids in interpreting complex medical vocabulary.

Prefixes

Prefixes are word parts added to the beginning of a term to modify its meaning. They often indicate location, number, or time.

• Dis-: to rid of, to undo a natural state Example: Dislocation – the displacement of a bone from its normal position.

• Dors-/Dorsi-/Dorso-: back or posterior part Example: Dorsal – relating to the back or posterior part of the body.

• Dys-: difficult, not well, difficulty with Example: Dysphagia – difficulty in swallowing.

• Ecto-: outside Example: Esophageal – pertaining to the esophagus. (Additional info: Ecto- more commonly means 'outside', but in this example, the root 'esophag-' is used.)

• Erythro-: red Example: Erythrocyte – a red blood cell.

• Exo-: outside, external Example: Exocrine – glands that secrete substances outside the body.

• Extra-/Extero-: external, beyond Example: Extranuclear – outside the nucleus.

Suffixes

Suffixes are added to the end of root words to alter their meaning, often indicating a procedure, condition, or disease.

• -ectomy: removal Example: Appendectomy – surgical removal of the appendix.

• -emia: condition of the blood Example: Hemoglobinemia – presence of hemoglobin in the blood.

• -es: condition Example: Neurosis – a functional mental disorder involving anxiety.

• -gram: an image Example: Electrocardiogram (ECG) – a graphical representation of heart activity.

• -graph: an instrument for recording Example: Sonograph – an instrument for producing sonograms (ultrasound images).

• -graphy: the process of taking X-rays or images Example: Radiography – the process of taking X-ray images.

Root Words

Root words form the base of medical terms and usually indicate the involved body part or system.

• Endo-: within Example: Endoscope – a procedure to look inside the body using a camera.

• Fibro-/Fibr-: fiber Example: Fibrosis – abnormal formation of fibrous tissue.

• Gastr-/Gastro-: stomach Example: Gastritis – inflammation of the stomach lining.

• Hemat-/Hemato-: blood Example: Hemoglobin – a protein in red blood cells that carries oxygen.

• Hemi-: half Example: Hemiplegia – paralysis on one side of the body.

• Hetero-: different, dissimilar Example: Heterogeneous – composed of different or dissimilar elements.

• Hist-/Histo-/Histio-: tissue Example: Histology – the study of tissues.

Table: Medical Terminology Components

The following table summarizes the main prefixes, suffixes, and root words, along with their definitions and examples:

Category	Term	Definition	Example
Prefix	Dis-	to rid of, to undo a natural state	Dislocation – the displacement of a bone from its normal position
Root Words	Dors-/Dorsi-/Dorso-	back or posterior part	Dorsal – relating to the back or posterior part of the body
Prefix	Dys-	difficult, not well, difficulty with	Dysphagia – difficulty in swallowing
Suffix	-ectomy	removal	Appendectomy – surgical removal of the appendix
Root Words	Endo-	within	Endoscope – a procedure to look inside the body using a camera
Root Words	Erythro-	red	Erythrocyte – a red blood cell
Suffix	-es	condition	Neurosis – a functional mental disorder involving anxiety
Prefix	Eu-	regular, well	Eupnea – normal, healthy breathing
Prefix	Exo-	outside, external	Exocrine – glands that secrete substances outside the body
Prefix	Extra-/Extero-	external, beyond	Extranuclear – outside the eye
Root Words	Fibr-/Fibro-	fiber	Fibrosis – abnormal formation of fibrous tissue
Root Words	Gastr-/Gastro-	stomach	Gastritis – inflammation of the stomach lining
Suffix	-gram	an image	Electrocardiogram (ECG) – a graphical representation of heart activity
Suffix	-graph	an instrument for recording	Sonograph – an instrument for producing sonograms (ultrasound images)
Suffix	-graphy	the process of taking X-rays or images	Radiography – the process of taking X-ray images
Root Words	Hem-/Hema-/Hemato-	blood	Hemoglobin – a protein in red blood cells that carries oxygen
Root Words	Hemi-	half	Hemiplegia – paralysis on one side of the body
Root Words	Heter-/Hetero-	different, dissimilar	Heterogeneous – composed of different or dissimilar elements
Root Words	Hist-/Histo-/Histio-	tissue	Histology – the study of tissues

Key Takeaways

• Medical terms are often constructed from a combination of prefixes, root words, and suffixes.

• Understanding the meaning of each component helps in deciphering unfamiliar terminology.

• Many terms are directly related to anatomical structures, physiological processes, or pathological conditions.

Example Application: The term hemigastrectomy can be broken down as follows: hemi- (half) + gastr- (stomach) + -ectomy (removal), meaning surgical removal of half the stomach.