The first time you see cardiomyopathy in a lecture, you can do one of two things. You can write it down and try to memorize it as one long word, alongside the hundred other long words from that day. Or you can break it apart: cardio (heart) + myo (muscle) + pathy (disease). Heart muscle disease.
The second move is the survival move. There are roughly 300 Greek and Latin word parts that account for about 90% of the anatomy and pathology vocabulary you will encounter in A&P, in nursing school, in medical school, and across any clinical career you might end up in. Learn the word parts and you can decode words you have never seen before. Memorize whole words and you will run out of room in your head halfway through the term.
This guide gives you the high-frequency parts in three groupings: directional terms (the language of where), body planes and sections (the language of how it’s cut), and word parts (the language of what anything is). At the end is a small set of mnemonics that are accurate — the discipline has retired several of the older ones.
Anatomical position — the reference frame
Every directional term in A&P assumes the body is in anatomical position: standing upright, facing forward, arms at the sides, palms facing forward, feet shoulder-width apart, toes pointing forward. This matters because terms like “medial” and “lateral” reverse meaning depending on whether the palm is facing forward or backward. Anatomical position fixes the reference frame so the vocabulary is unambiguous.
Quick test: in anatomical position, is the thumb medial or lateral? — Lateral. (The palm faces forward, so the thumb points away from midline.) If you turn the palm to face backward, the thumb appears to be medial — but in anatomical terminology, we always describe it as lateral, because we always describe relative to anatomical position.
Directional terms — the language of where
These come in pairs. Memorize the pair, not each term in isolation. The pair is the unit of meaning.
| Term | Meaning | Example sentence |
|---|---|---|
| Superior ↔ Inferior | Above ↔ below (toward head ↔ toward feet) | The heart is superior to the diaphragm. |
| Anterior ↔ Posterior | Front ↔ back (also: ventral ↔ dorsal in many contexts) | The sternum is anterior to the spine. |
| Medial ↔ Lateral | Toward midline ↔ away from midline | The big toe is medial to the little toe. |
| Proximal ↔ Distal | Closer to point of attachment ↔ farther from it (limbs only) | The elbow is proximal to the wrist. |
| Superficial ↔ Deep | Toward surface ↔ away from surface | The skin is superficial to the muscles. |
| Cranial / Cephalic ↔ Caudal | Toward head ↔ toward tail (used in animal anatomy and sometimes in human embryology) | The thoracic vertebrae are cranial to the lumbar vertebrae. |
| Ipsilateral ↔ Contralateral | Same side ↔ opposite side | A right-sided stroke produces contralateral weakness (left side). |
| Parietal ↔ Visceral | Of the wall ↔ of the organ (used for serous membranes) | The parietal pleura lines the chest wall; the visceral pleura covers the lung. |
Body planes and sections — the language of how it’s cut
When you see a tissue slide or a CT scan, the orientation depends on which plane the section was made through. The same kidney looks completely different in coronal vs transverse section.
| Plane / section | What it does |
|---|---|
| Sagittal plane | Vertical, divides body into left and right portions. Midsagittal = exactly down the midline (equal halves). Parasagittal = parallel to midline but offset (unequal portions). |
| Coronal (frontal) plane | Vertical, divides body into anterior and posterior portions. The plane your face is in. |
| Transverse (horizontal, axial) plane | Horizontal, divides body into superior and inferior portions. CT scans are typically displayed in transverse section. |
| Oblique section | Any cut that doesn’t align with the three primary planes. Common in real specimens; tricky for students because everything is foreshortened. |
| Cross-section vs longitudinal section | For tubular structures (vessels, nerves, intestine): cross-section is perpendicular to the long axis (you see a circle); longitudinal section is parallel (you see the tube’s length). |
Word parts — the high-frequency 200
Below are the parts you will see over and over. Learn them once. From here on, decoding a new term takes seconds, not memorization sessions.
Body region prefixes
| Part | Meaning | Example |
|---|---|---|
| cardio- | heart | cardiology, cardiomyopathy |
| cephalo- | head | cephalic, encephalitis (brain inflammation) |
| cervico- | neck | cervical vertebrae, cervix |
| cysto- | bladder, sac | cystitis, cholecystectomy (gallbladder removal) |
| derm-, dermato- | skin | dermis, dermatology |
| entero- | intestine | enteritis, gastroenterology |
| gastro- | stomach | gastric, gastritis |
| hepato- | liver | hepatitis, hepatic portal vein |
| hyster-, metro- | uterus | hysterectomy, endometrium |
| myo- | muscle | myocardium, myalgia |
| nephro-, reno- | kidney | nephron, renal artery |
| neuro- | nerve, nervous | neuron, neurology |
| oculo-, ophthalmo- | eye | ocular, ophthalmology |
| oto- | ear | otitis, otoscope |
| orchi-, testic- | testis | orchitis, testicular |
| osteo- | bone | osteology, osteoporosis |
| pneumo-, pulmo- | lung | pneumonia, pulmonary |
| procto-, recto- | rectum, anus | proctology |
| salpingo- | tube (uterine or auditory) | salpingitis |
| spleno- | spleen | splenectomy |
| thoraco- | chest | thoracic cavity |
| vaso-, angio- | vessel | vasodilation, angiogram |
Tissue and cell prefixes
| Part | Meaning | Example |
|---|---|---|
| adipo-, lipo- | fat | adipose tissue, liposuction |
| chondro- | cartilage | chondrocyte, chondritis |
| cyto-, -cyte | cell | cytology, leukocyte |
| epi- | upon, over | epidermis, epithelium |
| erythr(o)- | red | erythrocyte (red blood cell) |
| fibro- | fiber | fibroblast, fibrocartilage |
| hemato-, hemo- | blood | hematology, hemoglobin |
| histo- | tissue | histology |
| leuko- | white | leukocyte (white blood cell) |
| lympho- | lymph | lymphocyte |
| melano- | black, dark | melanin, melanoma |
| myelo- | marrow OR spinal cord | myeloid (marrow), myelin (sheath); context tells you which |
| nucleo- | nucleus | nucleolus, mononuclear |
| poiesis | formation, production | erythropoiesis, hematopoiesis |
| somato- | body | somatic, psychosomatic |
| thrombo- | clot | thrombocyte (platelet), thrombosis |
Process and condition suffixes
| Part | Meaning | Example |
|---|---|---|
| -algia | pain | myalgia (muscle pain), neuralgia (nerve pain) |
| -ectomy | surgical removal | appendectomy, hysterectomy |
| -emia | blood condition | anemia (low blood / RBCs), hyperglycemia (high blood sugar) |
| -genesis | origin, formation | spermatogenesis, gluconeogenesis |
| -genic | produced by, causing | pathogenic, carcinogenic |
| -gram | recording | electrocardiogram (ECG) |
| -graph | device that records | electrocardiograph (the machine) |
| -itis | inflammation | tendinitis, gastritis, hepatitis |
| -logy | study of | cytology, neurology |
| -lysis | breakdown, destruction | hemolysis (RBC breakdown), glycolysis |
| -megaly | enlargement | cardiomegaly, splenomegaly |
| -oma | tumor (often benign) | lipoma (benign fat tumor), carcinoma (malignant epithelial tumor) |
| -osis | condition (often abnormal) | acidosis, thrombosis |
| -ostomy | surgical creation of an opening | colostomy, tracheostomy |
| -otomy | surgical incision | phlebotomy (vein incision), tracheotomy |
| -pathy | disease | cardiomyopathy, neuropathy |
| -penia | deficiency, lack | leukopenia, thrombocytopenia |
| -plasia | growth, formation | hyperplasia, dysplasia |
| -plegia | paralysis | paraplegia, hemiplegia |
| -pnea | breathing | apnea (no breathing), tachypnea (fast) |
| -rrhage, -rrhagia | excessive flow | hemorrhage, menorrhagia |
| -rrhea | flow, discharge | diarrhea, rhinorrhea (runny nose) |
| -scopy | examination using a scope | colonoscopy, endoscopy |
| -sclerosis | hardening | atherosclerosis, multiple sclerosis |
| -stasis | standing still, equilibrium | hemostasis, homeostasis |
| -trophy | nourishment, growth | hypertrophy, atrophy |
| -uria | urine condition | hematuria (blood in urine), polyuria |
Quantity and quality prefixes
| Part | Meaning | Example |
|---|---|---|
| a-, an- | without, lacking | anemia, apnea, anuria |
| brady- | slow | bradycardia (slow heart rate) |
| dys- | difficult, disordered | dyspnea (difficult breathing), dysplasia |
| eu- | good, normal | eupnea (normal breathing) |
| hemi- | half | hemiplegia, hemisphere |
| hyper- | excessive, above normal | hypertension, hyperglycemia |
| hypo- | insufficient, below normal | hypothermia, hypoxia |
| iso- | equal | isotonic, isothermal |
| macro- | large | macrophage |
| micro- | small | microscope, microvilli |
| mono-, uni- | one | monocyte, unilateral |
| multi-, poly- | many | multipolar (neuron), polycythemia |
| oligo- | few | oligodendrocyte (few processes) |
| pan- | all | pancytopenia (all cell lines low) |
| para- | beside, alongside | parathyroid, parasagittal |
| peri- | around | pericardium, periosteum |
| tachy- | fast | tachycardia (fast heart rate), tachypnea |
| tetra-, quadri- | four | tetralogy of Fallot, quadriceps |
| tri- | three | triceps, tricuspid |
| bi- | two | biceps, bicuspid (mitral) valve |
Action and direction prefixes
| Part | Meaning | Example |
|---|---|---|
| ab- | away from | abduction (movement away from midline) |
| ad- | toward | adduction (movement toward midline) |
| circum- | around | circumduction (conical movement) |
| contra- | against, opposite | contralateral, contraindication |
| ecto-, exo-, ex- | outside, out | ectopic (out of place), exocrine (secretes outward) |
| endo-, ento- | within, inside | endocrine (secretes inward), endoplasmic, endometrium |
| extra- | outside, beyond | extracellular, extracorporeal |
| infra- | below, beneath | infraspinatus (muscle below the scapular spine) |
| inter- | between | intercostal (between the ribs), interneuron |
| intra- | within | intracellular, intramuscular |
| retro- | behind, backward | retroperitoneal (behind the peritoneum, e.g. kidneys) |
| sub- | under, below | subcutaneous, submandibular |
| supra- | above | supraspinatus (muscle above the scapular spine) |
| trans- | across, through | transverse, transdermal |
Mnemonics that are still accurate
A few classic A&P mnemonics have been retired because the sequences they encoded have been corrected or because the phrasing isn’t something instructors can comfortably teach in a modern classroom. Here are versions that are accurate and won’t embarrass anyone.
Cranial nerves (I–XII)
The classic mnemonic for the cranial nerves is “Old Olympus’ Towering Tops...” Both old versions of the rest of the phrase have aged poorly. A clean modern version: “Oh Once One Takes The Anatomy Final, Very Good Vacations Are Heavenly.” Each first letter matches: Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducens, Facial, Vestibulocochlear, Glossopharyngeal, Vagus, Accessory, Hypoglossal.
Cranial nerve type (sensory / motor / both)
“Some Say Marry Money But My Brother Says Big Brains Matter Most.” S = sensory, M = motor, B = both. In order: I sensory, II sensory, III motor, IV motor, V both, VI motor, VII both, VIII sensory, IX both, X both, XI motor, XII motor.
Carpal bones (proximal row, then distal row, lateral to medial)
“Some Lovers Try Positions That They Can’t Handle.” Proximal row: Scaphoid, Lunate, Triquetrum, Pisiform. Distal row: Trapezium, Trapezoid, Capitate, Hamate. (This one survives intact and is still the canonical version in most A&P texts.)
Layers of the epidermis (deep to superficial)
“Boys Skinny-dip Going Late, Cold.” Basale, Spinosum, Granulosum, Lucidum (thick skin only), Corneum.
Heart valve sounds (auscultation sites)
“All Patients Take Medicine.” Aortic, Pulmonary, Tricuspid, Mitral — in order clockwise around the chest from upper right.
Mnemonics are study aids, not answers. On a practical exam where you’re asked to identify cranial nerve VII, writing “Facial” is the answer. Writing “Oh Once One Takes...” is not. The mnemonic gets you to the answer; the answer is what you write down.
Putting it all together — decoding new terms
Once you know the parts, decoding works left-to-right, prefix + root + suffix. Try it on a few:
- Cardiomegaly → cardio- (heart) + -megaly (enlargement) = enlarged heart
- Hyperglycemia → hyper- (excessive) + -glyc- (sugar) + -emia (blood condition) = excessive blood sugar
- Pericarditis → peri- (around) + cardi- (heart) + -itis (inflammation) = inflammation of the membrane around the heart
- Splenomegaly → spleno- (spleen) + -megaly (enlargement) = enlarged spleen
- Endometriosis → endo- (within) + metr- (uterus) + -osis (condition) = a condition of uterine lining tissue (where it shouldn’t be)
- Cholecystectomy → chole- (bile) + cysto- (sac) + -ectomy (surgical removal) = surgical removal of the gallbladder
Once this becomes automatic — and it does, faster than you’d think — you can decode any clinical or anatomical term you encounter for the rest of your career. The vocabulary stops being a memorization burden and becomes a small alphabet you can read.
Companion resources on this site
- How to study A&P (the science of learning, applied)
- Lab notebook starter guide
- Practical assessment rubric system — the per-unit controlled vocabulary lists in the rubric packets are also excellent study reference material.