Anatomy & Physiology: Foundational Terminology, Body Planes, Regions, and Cavities

Medical Terminology and Word Building

Prefixes, Suffixes, and Combining Forms

Medical terminology uses prefixes, suffixes, and combining forms to describe anatomical structures, physiological processes, and pathological conditions. Understanding these components is essential for interpreting medical language.

• Leuko-: Prefix meaning pathology/bad (Additional info: Actually means "white," often used to describe white blood cells, e.g., leukocyte).

• Melan(o)-: Prefix meaning excessive or above normal (Additional info: Actually means "black" or "dark," e.g., melanin).

• Intra-: Prefix meaning "within" or "inside."

• Peri-: Prefix meaning "around."

• Cyan(o)-: Combining word meaning "blue."

• -lis: Suffix meaning "soft" (Additional info: Possibly refers to "-lysis" meaning breakdown or destruction).

• Epi-: Prefix meaning "above" or "upon."

• Cyt(o)-: Combining word meaning "cell."

• -algia: Suffix meaning "pain."

Word Building Table

Medical Terminology	Prefix, Suffix, or Combining Word	Build a Proper Word
Inter-	Prefix meaning "between"	Intercostal (between the ribs)
Epi-	Prefix meaning "upon" or "above"	Epidermis (upon the dermis)
Hypo-	Prefix meaning "below" or "deficient"	Hypoglycemia (low blood sugar)
Oste(o)-	Combining form meaning "bone"	Osteocyte (bone cell)
Arthr(o)-	Combining form meaning "joint"	Arthritis (inflammation of a joint)
-oma	Suffix meaning "tumor" or "mass"	Carcinoma (cancerous tumor)
Brady-	Prefix meaning "slow"	Bradycardia (slow heart rate)
My(e)-	Combining form meaning "muscle" or "spinal cord"	Myelocyte (bone marrow cell)

Additional info: Some definitions in the original table were inferred or corrected for accuracy.

Body Planes and Directional Terminology

Major Anatomical Planes

Body planes are imaginary lines used to divide the body into sections for anatomical study and medical reference.

• Coronal (Frontal) Plane: Divides the body into anterior (front) and posterior (back) sections.

• Transverse (Horizontal) Plane: Divides the body into superior (upper) and inferior (lower) sections.

• Sagittal Plane: Divides the body into right and left sections. The midsagittal plane divides the body into equal right and left halves.

Directional Terms

Directional terms describe the locations of structures relative to other structures or locations in the body.

• Anterior: Toward the front of the body.

• Posterior: Toward the back of the body.

• Superior: Above or toward the head.

• Inferior: Below or toward the feet.

• Medial: Toward the midline of the body.

• Lateral: Away from the midline of the body.

• Proximal: Closer to the point of attachment or origin.

• Distal: Farther from the point of attachment or origin.

• Superficial: Toward or at the body surface.

• Deep: Away from the body surface; more internal.

Example: The heart is medial to the lungs, and the wrist is distal to the elbow.

Major Body Regions and Skeletal Landmarks

Regional Terms

Regional terms are used to specify areas within the major divisions of the body, often corresponding to underlying bones or anatomical landmarks.

• Abdominal: Region between the chest and pelvis.

• Patellar: Anterior knee region.

• Femoral: Thigh region.

• Brachial: Arm region.

• Cervical: Neck region.

• Malleolar: Ankle region.

• Axillary: Armpit region.

• Humeral: Upper arm region.

• Lumbar: Lower back region.

• Cranial: Skull region.

• Costal: Rib region.

• Radial: Lateral forearm (thumb side).

• Ulnar: Medial forearm (little finger side).

• Tibial: Medial lower leg (shin).

• Sternal: Breastbone region.

• Fibular: Lateral lower leg.

Example: The patellar region is anterior to the femoral region.

Body Cavities and Abdominopelvic Regions

Major Body Cavities

The body contains several major cavities that house organs and protect them from injury.

• Cranial cavity: Contains the brain.

• Thoracic cavity: Contains the heart and lungs.

• Abdominal cavity: Contains digestive organs such as the stomach, liver, and spleen.

• Pelvic cavity: Contains reproductive organs, bladder, and rectum.

Abdominopelvic Regions and Quadrants

The abdominopelvic area is divided into nine regions and four quadrants to help locate organs and describe pain or pathology.

Organs	Abdominopelvic Region	Abdominopelvic Quadrant	Cavity
Stomach	Epigastric	Left Upper Quadrant (LUQ)	Abdominal
Spleen	Left Hypochondriac	Left Upper Quadrant (LUQ)	Abdominal
Liver	Right Hypochondriac	Right Upper Quadrant (RUQ)	Abdominal
Appendix	Right Iliac (Inguinal)	Right Lower Quadrant (RLQ)	Abdominal
Gallbladder	Right Hypochondriac	Right Upper Quadrant (RUQ)	Abdominal
Uterus	Hypogastric (Pubic)	Lower Quadrants	Pelvic
Bladder	Hypogastric (Pubic)	Lower Quadrants	Pelvic

Additional info: Table entries inferred based on standard anatomical locations.

Clinical Application: Anatomical Position and Pain Localization

Using Anatomical Terms in Clinical Scenarios

Healthcare professionals use anatomical terminology to accurately describe locations of pain, injury, or pathology.

• Anatomical Position: The body standing upright, facing forward, arms at the sides with palms facing forward.

• Example: "Distal radial region" refers to the area near the wrist on the thumb side; "proximal humeral region" refers to the upper arm near the shoulder.

• Clinical Question: If a patient has pain in the right lower quadrant, possible organs involved include the appendix and portions of the intestines.

Summary Table: Directional Terms and Their Opposites

Term	Opposite
Anterior	Posterior
Superior	Inferior
Medial	Lateral
Proximal	Distal
Superficial	Deep
Right	Left

Key Formulas and Equations

While anatomy and physiology rely more on descriptive terms than equations, some physiological processes can be described mathematically.

• Body Surface Area (BSA): Used in clinical settings to calculate drug dosages.

$BSA = \sqrt{\frac{height (cm) \times weight (kg)}{3600}}$

Additional info: Formula included for academic completeness.

Conclusion

Mastery of anatomical terminology, body planes, regions, and cavities is foundational for success in Anatomy & Physiology. These concepts enable precise communication in clinical and academic settings, supporting accurate diagnosis and effective treatment.