Foundations of Anatomy: Microscopic and Gross Anatomy, plus Other Types of Anatomical Studies

Anatomy: Study of body structures (external & internal) and their physical relationships.
- Provides clues about probable functions.
Physiology: Study of the function of bodily structures.
- Physiological mechanisms are explained by underlying anatomy; functions are performed by specific anatomical structures.
- Example: Nasal cavity filters, warms, and humidifies air due to its bone shapes and moist lining.

KEY POINT: Study of structures too small to be seen by the naked eye; includes cytology and histology.
- Boundaries defined by equipment (e.g., electron microscope for structures $10^6$ times smaller).
Cytology: Analyzes the internal structure of cells, the smallest units of life.
Histology: Examines tissues, groups of specialized cells and cell products performing specific functions.
- Four basic tissue types: epithelial, connective, muscle, and neural tissue.
- Tissues combine to form organs (anatomical structures with multiple functions).

KEY POINT: Study of structures and features visible to the naked eye (macroscopic anatomy).
Approaches to gross anatomy:
- Surface anatomy: Study of general anatomical form and how superficial markings relate to deeper structures.
- Regional anatomy: Study of superficial and internal features in a specific body area (e.g., head, neck).
- Systemic anatomy: Study of anatomy based on the body's organ systems.
  - An organ system is a group of organs functioning together for coordinated effects (e.g., cardiovascular system).
  - There are $11$ organ systems in the human body.

KEY POINT: Includes developmental, comparative, clinical, surgical, radiographic, and cross-sectional anatomy.
- Developmental anatomy: Studies structural changes from conception to maturity.
  - Embryology: Study of early developmental processes (first $2$ months).
- Comparative anatomy: Studies anatomical organization across different animal types, reflecting evolutionary relationships.

Anatomy-physiology linkage: Form follows function.
Practical implications: Guides personal health decisions, diagnostics, and interpretation of bodily changes.
Foundational role: Underpins advanced topics in medicine and related fields.

Anatomy: Study of body structures and their relationships.
Physiology: Study of function and mechanisms of bodily structures.
Cytology: Internal cell structure analysis.
Histology: Tissue-level analysis (epithelial, connective, muscle, neural tissues).
Organ: Anatomical structure with multiple