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Scale of Anatomy • Microscopic anatomy • Gross anatomy
Microscopic Anatomy • Study of structures visible only with the aid of magnification • Structures less than 1mm • Study limited by technology • Two main categories • Cytology • Histology
Cytology • Studies the internal structure of individual cells • Cyto= “cell” ology= “study of” • “unit of Life” • 50-100 trillion cells in the body
Histology • Study of structure & organization of groups of cells aka tissues • Tissue= groups of organized specialized cells that perform similar functions
Gross Anatomy • Aka macroscopic anatomy • Study of structures visible without a microscope • Three main types • Surface anatomy • Regional anatomy • Systemic anatomy
Surface Anatomy • Study of the body using superficial anatomical markings
Regional Anatomy • Study structure of specific body regions • Incorporates superficial and internal features • Emphasizes relationships between structures • Ex. Upper extremity
Systemic Anatomy • Study structure of major body systems • 11 body systems
Physiology • Study of the function of anatomical structures • Physical & chemical properties • Cell physiology • Special physiology • System physiology • Pathological physiology
Anatomical Terminology • Why is it important? • How are things named? • Anatomical structures- landmarks • Specialized directional terms • Location • Proper nouns
Anatomical Terminology • Standard anatomical position • Body regions • Body orientation & direction • Body planes & sections • Body cavities
Standard Anatomical Position • Standard body position • Aka “anatomy neutral” • Body standing erect • Head & toes point forward • Arms hanging at sides • Palms face forward
Body Positions • Supine • Lying down in the anatomical position with face up • Prone • Lying down in the anatomical position with face down What’s wrong with this picture?
Principle Anatomical Regions Martini Table 1-1
Body Orientation & Direction Martini table 1-2
Body Planes & Sections • Section= imaginary cut along specific lines (planes) through the body • Body Plane= 3 anatomical planes that lie at right angles • Sagittal • Frontal • Transverse • Oblique
Sagittal Plane • Longitudinal section into left & right halves • Midsagittal down the midline
Frontal Plane • Longitudinal section into anterior (front) & posterior (back) halves • Aka coronal
Transverse Plane • Horizontal plane divides body into superior (top) & inferior (bottom) halves • Cross sections
Body Cavities • Spaces in body that house organs • Protective • Allow change in size without damaging surrounding tissue • Two main categories • Dorsal body cavities • Ventral body cavities
Dorsal Body Cavities • Cranial cavity- • made by bones of skull • Spinal cavity- • surrounds spinal cord
Ventral Body Cavities • Spaces- cavities • Viscera- organs • Serous membrane- thin layer of tissue lines body cavities & viscera • 3 main body cavities • Thoracic • Abdominal • Pelvic
Thoracic Cavity • Bound by chest wall & diaphragm • 3 main internal chambers (subdivisions) • 2 pleural cavities • House lungs • Mediastinum • Houses trachea, esophagus, blood vessels • 1 Pericardial cavity • Houses heart
Abdominopelvic Cavity • Abdominal cavity • Aka Peritoneal cavity • Inferior surface of the diaphragm to superior margin of pelvis • Pelvic cavity • Enclosed by bones of pelvis