APTerm - Describing the Body

Anatomic Reference Systems

• Body planes, directions, cavities, and regions are used to describe the locations and functions of body parts.
• Anatomical Position: The standard position for anatomical reference.
  • Standing upright
  • Facing forward
  • Arms at side with palms forward
  • Feet slightly apart

Body Planes

• A plane separates the body into sections, providing a way to visualize internal structures.
  • Frontal (Coronal) Plane: Divides the body into anterior (front) and posterior (back) parts.
  • Anterior = front, Posterior = back (also referred to as ventral and dorsal).
  • Sagittal (Lateral) Plane: Divides the body into left and right sides.
  • Midsagittal (Midline) separates them equally.
  • Transverse (Axial) Plane: Divides the body into superior (upper) and inferior (lower) parts.
  • Superior = above, Inferior = below.

Body Cavities

• Definition: A body cavity is a space within the body that contains and protects internal organs.
• Major body cavities:
  • Dorsal Cavity: Located in the back, includes:
  • Cranial Cavity: Contains the brain.
  • Spinal Cavity: Contains the spinal cord.
  • Ventral Cavity: Located in the front, divided into:
  • Thoracic Cavity: Contains lungs and heart, further divided into:
    • Mediastinum
    • Pleural cavity
  • Abdominal Cavity: Contains digestive organs and is located below the diaphragm.
  • Pelvic Cavity: Contains bladder and reproductive organs, lined by peritoneum.

Abdominal Divisions

• The abdomen contains major organs, and its divisions help locate these organs:
  • Quadrants: Formed by midsagittal and transverse planes crossing at the umbilicus:
  • Right Upper Quadrant (RUQ)
  • Left Upper Quadrant (LUQ)
  • Right Lower Quadrant (RLQ)
  • Left Lower Quadrant (LLQ)
  • Regions: Nine regions for anatomic location:
  • Right Hypochondriac
  • Epigastric
  • Left Hypochondriac
  • Right Lumbar
  • Umbilical
  • Left Lumbar
  • Right Inguinal
  • Hypogastric
  • Left Inguinal

Key Body Cavities

1. Cranial Cavity: Contains the brain.
2. Spinal Cavity: Contains the spinal cord.
3. Thoracic Cavity: Contains lungs, heart, and associated structures.
4. Abdominal Cavity: Contains stomach, liver, intestines, etc.
5. Pelvic Cavity: Contains bladder and reproductive organs.

Back Divisions

• Cervical: Neck region.
• Thoracic: Upper back.
• Lumbar: Lower back.
• Sacral: Base of the spine.

Body Positions & Directions

• Superior: Above.
• Inferior: Below.
• Anterior: Front.
• Posterior: Back.
• Medial: Toward the midline.
• Lateral: Away from the midline.

Planes of the Body

• Sagittal: Divides the body into left and right.
• Frontal (Coronal): Divides the body into front and back.
• Transverse: Divides the body into top and bottom.

Word Elements (Medical Terminology)

• Prefix: Beginning of a word (e.g., "hyper-" meaning "excess").
• Root: Core meaning of a word (e.g., "cardi-" meaning "heart").
• Suffix: Ending of a word (e.g., "-itis" meaning "inflammation").