뒤로Introduction to Human Anatomy & Physiology: Organization, Terminology, and Body Structure
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The Language of Anatomy & Physiology
Importance of Terminology
Understanding the specialized vocabulary of anatomy and physiology is essential for clear communication among health science professionals. Mastery of this language allows for accurate description and understanding of the human body’s structure and function.
Form and Function: Anatomy & Physiology
Definitions and Subdivisions
Anatomy: The study of the structure of body parts and their relationships to one another.
Physiology: The study of the function of body parts and how they carry out life-sustaining activities.
Subdivisions of anatomy include:
Gross (macroscopic) anatomy: Study of large, visible structures.
Regional anatomy: Focuses on all structures in a specific area.
System anatomy: Examines one organ system at a time.
Surface anatomy: Studies internal structures as related to the overlying skin.
Microscopic anatomy: Structures too small to be seen with the naked eye (cytology and histology).
Developmental anatomy: Studies anatomical changes throughout life (including embryology).
Subdivisions of physiology are based on organ systems and often focus on cellular and molecular levels.
Principle of Complementarity: Structure and function are inseparable; what a structure can do depends on its form.
Levels of Structural Organization
Hierarchy of Complexity
The human body is organized from the smallest chemical level to the entire organism:
Chemical level: Atoms, molecules, and organelles
Cellular level: Cells made up of molecules
Tissue level: Groups of similar cells
Organ level: Two or more types of tissues
Organ system level: Organs working closely together
Organismal level: All organ systems combined to form the whole organism
Necessary Life Functions
Basic Functions Required for Life
Maintaining boundaries: Separation between internal and external environments (e.g., plasma membranes, skin)
Movement: Muscular system enables movement of body parts and substances
Responsiveness: Ability to sense and respond to stimuli
Digestion: Breakdown and absorption of nutrients
Metabolism: All chemical reactions in the body (catabolism and anabolism)
Excretion: Removal of metabolic wastes
Reproduction: Cellular division for growth/repair and production of offspring
Growth: Increase in size of a body part or organism
Survival Needs
Essential Factors for Human Survival
Nutrients: Chemicals for energy and cell building (carbohydrates, proteins, fats, vitamins, minerals)
Oxygen: Required for energy release from food
Water: Most abundant chemical in the body; necessary for chemical reactions
Normal body temperature: Needed for proper metabolic reactions (about 37°C)
Appropriate atmospheric pressure: Required for adequate breathing and gas exchange
Homeostasis
Maintaining Internal Balance
Homeostasis is the maintenance of relatively stable internal conditions despite continuous environmental changes. It is a dynamic equilibrium maintained by all organ systems, especially the nervous and endocrine systems.
Variables: Factors that can change (e.g., blood sugar, temperature, blood volume)
Homeostatic control mechanisms: Involve three components: receptor, control center, and effector
Feedback Mechanisms
Negative feedback: Most common; response reduces or shuts off the original stimulus (e.g., regulation of body temperature, blood glucose)
Positive feedback: Response enhances the original stimulus (e.g., blood clotting)
Anatomical Position and Directional Terms
Standard Anatomical Position
The body is erect, feet slightly apart, palms facing forward, and thumbs pointing away from the body. Directional terms are always based on this position.
Orientation and Directional Terms
Term | Definition | Example |
|---|---|---|
Superior (cranial) | Toward the head end or upper part of a structure or the body; above | The head is superior to the abdomen. |
Inferior (caudal) | Away from the head end or toward the lower part of a structure or the body; below | The navel is inferior to the chin. |
Anterior (ventral) | Toward or at the front of the body; in front of | The breastbone is anterior to the spine. |
Posterior (dorsal) | Toward or at the back of the body; behind | The heart is posterior to the breastbone. |
Term | Definition | Example |
|---|---|---|
Medial | Toward or at the midline of the body; on the inner side of | The heart is medial to the arm. |
Lateral | Away from the midline of the body; on the outer side of | The arms are lateral to the chest. |
Intermediate | Between a more medial and a more lateral structure | The collarbone is intermediate between the breastbone and shoulder. |
Term | Definition | Example |
|---|---|---|
Proximal | Closer to the origin of the body part or the point of attachment of a limb to the body trunk | The elbow is proximal to the wrist. |
Distal | Farther from the origin of a body part or the point of attachment of a limb to the body trunk | The knee is distal to the thigh. |
Superficial (external) | Toward or at the body surface | The skin is superficial to the skeletal muscles. |
Deep (internal) | Away from the body surface; more internal | The lungs are deep to the skin. |
Regional Terms
Major Body Divisions
Axial: Head, neck, and trunk
Appendicular: Limbs (arms and legs)
Regional terms designate specific areas within these divisions.
Body Planes and Sections
Common Anatomical Planes
Sagittal plane: Divides body into right and left parts
Midsagittal (median) plane: Cut on the midline
Parasagittal plane: Cut off-center from the midline
Frontal (coronal) plane: Divides body into anterior and posterior parts
Transverse (horizontal) plane: Divides body into superior and inferior parts
Oblique section: Cut at an angle other than 90° to a vertical plane
Body Cavities and Membranes
Main Body Cavities
Dorsal body cavity: Protects the nervous system; includes cranial cavity (brain) and vertebral cavity (spinal cord)
Ventral body cavity: Houses internal organs (viscera); includes thoracic cavity (heart and lungs) and abdominopelvic cavity (digestive, urinary, and reproductive organs)
Membranes in the Ventral Body Cavity
Serosa (serous membrane): Thin, double-layered membrane covering ventral body cavity surfaces
Parietal serosa: Lines internal body cavity walls
Visceral serosa: Covers internal organs
Layers separated by serous fluid to reduce friction
Specific names:
Pericardium: Heart
Pleurae: Lungs
Peritoneum: Abdominopelvic cavity
Abdominopelvic Quadrants and Regions
Quadrants
The abdominopelvic cavity is divided into four quadrants for clinical reference:
Right upper quadrant (RUQ)
Left upper quadrant (LUQ)
Right lower quadrant (RLQ)
Left lower quadrant (LLQ)
Nine Regions
For anatomical study, the abdominopelvic cavity is divided into nine regions:
Right hypochondriac
Epigastric
Left hypochondriac
Right lumbar
Umbilical
Left lumbar
Right iliac (inguinal)
Hypogastric (pubic)
Left iliac (inguinal)
Other Body Cavities
Additional Cavities
Oral and digestive cavities
Nasal cavity
Orbital cavities
Middle ear cavities
Synovial cavities: Joint cavities (not exposed to the environment)
