Medical Terminology Foundations

Prefixes, Suffixes, and Combining Forms

Medical terminology is built from word parts: prefixes, suffixes, and combining forms. Understanding these components is essential for interpreting and constructing medical terms.

• Prefix: Appears at the beginning of a word and modifies its meaning. Example: ad- means "toward".

• Suffix: Appears at the end of a word and often indicates a procedure, condition, or disease. Example: -osis means "condition".

• Combining Form: The root of a word plus a vowel (usually 'o'), used to connect word parts. Example: arthr/o means "joint".

Example: Kyphoscoliosis breaks down as kyph/o = humpback, scoli/o = spine curve, -osis = condition.

Example: Arthroplasty breaks down as arthr/o = joint, -plasty = surgical repair.

Common Prefixes

Prefixes modify the meaning of medical terms. Below are some frequently used prefixes:

• a-, an-: without, not

• ab-: away from

• ad-: toward

• ante-: before

• anti-: against

• auto-: self

• bi-: two

• brady-: slow

• con-: with, together

• dia-: through, across

• dys-: bad, difficult

• endo-: within

• epi-: upon, above

• hemi-: half

• hyper-: excessive, above

• hypo-: below, deficient

• inter-: between

• intra-: within

• macro-: large

• mal-: bad

• neo-: new

• pan-: all

• peri-: around

• poly-: many

• post-: after

• pre-: before

• re-: again

• retro-: backward

• sub-: under

• tachy-: fast

• trans-: across

Common Suffixes

Suffixes often indicate procedures, conditions, or diseases. Here are some key suffixes:

• -al, -ary, -eal, -ial, -ic, -ical, -ous: pertaining to

• -ase: enzyme

• -blast: immature cell

• -cele: hernia, swelling

• -centesis: surgical puncture

• -chezia: defecation

• -cyte: cell

• -desis: binding

• -ectasis: dilation

• -ectomy: removal

• -emia: blood condition

• -emesis: vomiting

• -gen: producing

• -gram: record

• -graphy: process of recording

• -iasis: abnormal condition

• -ion: action, condition

• -ist: specialist

• -itis: inflammation

• -kinesis: movement

• -logy: study of

• -lysis: destruction

• -megaly: enlargement

• -meter, -metry: measurement

• -oid: resembling

• -oma: tumor

• -opsy: view of

• -osis: condition

• -pathy: disease

• -penia: deficiency

• -phagia: eating

• -plasty: surgical repair

• -pnea: breathing

• -rrhage: bursting forth

• -rrhaphy: suturing

• -rrhea: flow, discharge

• -scope: instrument for viewing

• -scopy: process of viewing

• -spasm: involuntary contraction

• -stasis: stopping

• -stomy: creation of an opening

• -tomy: incision

• -um: structure

Common Combining Forms

Combining forms are used to build medical terms. Here are some examples:

• abdomin/o: abdomen

• adip/o: fat

• alg/o, alges/o: pain

• arteri/o: artery

• arthr/o: joint

• cardi/o, card/o: heart

• cephal/o: head

• chondr/o: cartilage

• derm/o: skin

• gastr/o: stomach

• hemat/o, hem/o: blood

• hepat/o: liver

• my/o, myos/o: muscle

• oste/o: bone

• pulmon/o: lung

• ren/o, nephr/o: kidney

• splen/o: spleen

• thromb/o: clot

• vas/o: vessel

• ven/o: vein

Example: Agranulocyte breaks down as a- = without, granul/o = granule, -cyte = cell.

Body Structure and Organization

Body Cavities

The human body contains five main cavities, each housing specific organs.

Body Quadrants

The abdomen is divided into four quadrants for clinical reference.

Body Regions

The abdomen is further divided into nine regions for detailed anatomical study.

Directional Terms

Directional terms describe the location of body structures relative to each other.

• Cephalad: toward the head

• Caudad: toward the tail

• Distal: farther from the point of attachment

• Proximal: closer to the point of attachment

• External: outside

• Internal: inside

• Superior: above

• Inferior: below

• Anterior: front

• Posterior: back

• Medial: toward the midline

• Lateral: away from the midline

Body Planes

Body planes are imaginary lines used to divide the body for anatomical study.

• Sagittal Plane: divides the body into left and right portions

• Coronal (Frontal) Plane: divides the body into anterior and posterior portions

• Transverse Plane: divides the body into superior and inferior portions

Basic Anatomy and Physiology

Skin (Integumentary System)

The skin is the largest organ of the body, providing protection, sensation, and regulation.

• Epidermis: outer layer, provides barrier

• Dermis: middle layer, contains blood vessels and nerves

• Subcutaneous: deepest layer, stores fat

• Functions: protection, temperature regulation, sensation

Gastrointestinal System

The gastrointestinal system is responsible for digestion and absorption of nutrients.

• Mouth: mastication (chewing), deglutition (swallowing)

• Esophagus: transports food

• Stomach: digestion

• Small intestine: absorption

• Large intestine: water absorption, defecation

Pulmonary System (Respiratory)

The pulmonary system enables gas exchange and breathing.

• Nares: nostrils

• Trachea: airway

• Bronchi: air passageways

• Lungs: gas exchange

Cardiovascular System

The cardiovascular system circulates blood and delivers oxygen and nutrients.

• Heart: pumps blood

• Arteries: carry blood away from heart

• Veins: return blood to heart

• Capillaries: exchange of substances

Musculoskeletal System

The musculoskeletal system provides structure, movement, and protection.

• Bones: support and protect

• Muscles: movement

• Joints: allow motion

Medical Vocabulary Terms

Key Terms and Definitions

Understanding medical vocabulary is essential for communication in healthcare.

Other Anatomical Terms

Position and Orientation

• Anterior: front

• Posterior: back

• Sagittal: divides left/right

• Coronal: divides front/back

• Dorsal: back side

• Supine: lying face up

• Prone: lying face down

• Transverse: divides top/bottom

• Superior: above

• Inferior: below

• Proximal: closer to origin

• Distal: farther from origin

Additional info: Academic context was added to expand brief lists and clarify definitions, as well as to organize fragmented content into structured study notes.