Human Anatomy: Chapter 1 - Introduction and Fundamentals
Introduction to Anatomy & Physiology
This lecture provides fundamental information, vocabulary, and definitions for human anatomy.
Anatomy: The study of the body's external and internal structures, and the physical relationships between body parts.
Physiology: The study of the function of the body's structures.
Etymology and Root Words
The word "anatomy" comes from "anatomia," meaning "to dissect."
Understanding root words (e.g., "cardio" for heart, "myo" for muscle) is crucial for success.
Types of Anatomy
Microscopic Anatomy
Studies structures not visible to the naked eye, requiring a magnifying instrument.
Cytology: Study of cells.
Histology: Study of tissues.
Gross Anatomy
Studies structures visible with the naked eye.
Surface Anatomy: General anatomical forms.
Regional Anatomy: Specific body areas.
Systemic Anatomy: Body based on organ systems.
Other Types of Anatomy
Developmental Anatomy: Changes from fertilization to maturity.
Comparative Anatomy: Anatomical organization of different animals.
Levels of Organization of Living Organisms
Living organisms exhibit increasing complexity:
Chemical or Molecular Level: Atoms and molecules.
Cellular Level: Smallest units of life.
Tissue Level: Cells working together for a function.
Organ Level: Tissues working together for a function.
Organ System Level: Organs working together for a role.
Organism Level: All systems working together.
Chemical Level & Body Composition
Common Atoms: Hydrogen, Carbon, Oxygen.
Major Body Composition: Water (%), Proteins, Lipids. Carbohydrates provide short-term energy; proteins are the "units of work" (structural or enzymes).
The Major Organ Systems
These systems make up the human body and perform specialized roles:
Integumentary
Skeletal
Muscular
Nervous
Endocrine
Cardiovascular
Lymphatic
Respiratory
Digestive
Urinary
Reproductive
Characteristics of Life
Every living organism exhibits:
Responsiveness (Irritability): Respond to surroundings.
Growth and Differentiation: Increase in size/number and specialization of cells.
Reproduction: Create new individuals.
Movement: Internal or external.
Metabolism: Total chemical reactions (Anabolism: synthesis; Catabolism: breakdown).
Respiration: Absorption, transport, use of oxygen.
Excretion: Removal of waste materials.
Language of Anatomy: Vocabulary & Standardized Terms
A standardized vocabulary (many terms from Latin/Greek roots) is essential for clear communication in anatomy and medicine.
Anatomical Positions
Basic Anatomical Position: Standing upright, feet flat, palms forward.
Supine Position: Lying face up.
Prone Position: Lying face down.
Abdominal Pelvic Quadrants and Regions
The abdominal pelvic region is divided for clinical localization:
Four Quadrants: Right/Left Upper/Lower Quadrant (RUQ, RLQ, LUQ, LLQ).
Nine Regions: Provide more specific localization (e.g., hypochondriac, lumbar, inguinal regions).
Anatomical Directions
Standardized terms for clear navigation:
Superior/Inferior: Towards head/tail.
Anterior (Ventral)/Posterior (Dorsal): Towards front/back.
Medial/Lateral: Towards/away from midline.
Superficial/Deep: Close to surface/interior.
Proximal/Distal: Closer to/away from point of attachment (appendages).
Anatomical Planes and Sections
Used to visualize internal structures:
Frontal or Coronal Plane: Divides into anterior/posterior.
Transverse or Horizontal or Cross-sectional Plane: Divides into top/bottom.
Sagittal Planes: Divides into right/left portions.
Midsagittal Plane: Equal halves.
Parasagittal Plane: Unequal halves.
Body Cavities
Major cavities house specific organs:
Posterior Cavities: Cranial, Spinal.
Anterior Cavities: Thoracic, Abdominal, Pelvic.