Introduction to Anatomy & Physiology: Foundational Concepts and Terminology

Introduction to Anatomy & Physiology

Overview

This study guide introduces the foundational concepts of anatomy and physiology, including their definitions, interrelationships, major branches, and essential terminology. Understanding these basics is crucial for further study in biological and health sciences.

Lecture Outcomes

• Define anatomy and physiology.

• Describe how anatomy and physiology are related.

• Identify and describe the different levels of organization in the body.

• Identify different body regions using anatomical terminology.

• Describe and use anatomically correct directional terms.

• Identify the major body cavities and the structures they contain.

• Identify the major body movements and demonstrate them.

Form and Function of Anatomy & Physiology

Definitions

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of body parts; how they work to carry out life-sustaining activities.

Example: The anatomy of the heart includes its chambers and valves, while physiology explains how the heart pumps blood.

Branches of Anatomy

Gross Anatomical Branches

• Surface Anatomy: Study of general form and superficial markings.

• Regional Anatomy: Focuses on anatomical organization of specific areas (e.g., head, trunk, thorax).

• Systemic Anatomy: Studies the structure of organ systems.

• Developmental Anatomy: Describes changes in form from conception to physical maturity (includes embryology).

• Clinical Anatomy: Includes subspecialties in clinical practice (e.g., pathological anatomy, surgical anatomy).

Microscopic Anatomical Branches

• Cytology: The analysis of the internal structures of individual cells.

• Histology: The examination of tissues.

Branches of Physiology

• Cell Physiology: The study of functions of cells.

• Organ Physiology: The study of physiology of specific organs (e.g., pulmonary or cardiac physiology).

• Systemic Physiology: Functions of organ systems.

• Pathological Physiology: Effects of pathologies (diseases) on system functions.

Relationship Between Anatomy and Physiology

All specific functions in the body are performed by specific structures. The structure of a body part provides clues about its function, and functions can only be explained using the underlying structures.

Example: The thin walls of the alveoli in the lungs (anatomy) allow for efficient gas exchange (physiology).

Principle of Complementary Structure and Function

Anatomy and physiology are inseparable. Function always reflects structure. What a structure can do depends on its specific form. This is known as the principle of complementarity of structure and function.

• Example: The shape of teeth determines their function—incisors are sharp for cutting, while molars are flat for grinding.

The Language of Anatomy and Physiology

Key Terms

• Pathology: The study of disease and disorders. Signs (observable, e.g., swelling, bleeding) and symptoms (subjective, e.g., pain, nausea) are used to describe diseases.

• Pathogen: Something that causes disease (e.g., virus, bacteria).

• -itis: Suffix indicating inflammation (e.g., arthritis = arthro- (joint) + -itis (inflammation)).

Word Construction in Anatomy & Physiology

Most terms are built from roots, prefixes, and suffixes. Understanding these parts helps in deciphering complex terminology.

• Myocardium: myo- (muscle) + cardi- (heart) + -um (noun suffix) = heart muscle.

• Subcutaneous: sub- (below) + cutan- (skin) + -eous (pertaining to) = below the skin.

• Scapular: scapula (shoulder blade) + -ar (pertaining to) = pertaining to the shoulder blade.

• Pericardium: peri- (around) + cardi- (heart) + -um (noun suffix) = membrane surrounding the heart.

• Osteocyte: osteo- (bone) + -cyte (cell) = bone cell.

• Erythrocyte: erythro- (red) + -cyte (cell) = red blood cell.

Additional info: Mastery of medical terminology is essential for clear communication in health sciences.

Applied Physiology Example

Why Do I Sneeze When I Pluck My Eyebrows?

• Sneezing typically starts with irritation of the nasal passage, exciting the trigeminal nerve.

• The trigeminal ganglion sends the impulse to the brain's "sneezing center." This center sends signals to facial muscles, eyelids, and other areas, resulting in a sneeze.

• Plucking eyebrows stimulates a branch of the trigeminal nerve, which can trigger the sneeze reflex even without nasal irritation.

Example: This demonstrates how anatomical structures (nerves) and physiological responses (sneezing) are interconnected.