Body

• The fluid in a serous membrane allows the viscera to move smoothly, such as when the lungs inflate and deflate during breathing
• Planes divide the body in various ways to produce sections
• A sagittal plane is a vertical plane that divides the body or an organ into right and left sides
• Planes dividing the body

  • Midsagittal plane
  • Transverse plane
  • Frontal plane
• A membrane is a thin, pliable tissue that covers, lines, partitions, or connects structures
• Between the two layers of a serous membrane is a fluid that contains a small amount of lubricating fluid (serous fluid)
• When a sagittal plane passes through the midline of the body dividing it into equal right and left sides, it is called a midsagittal plane or a median plane
• Parts of a serous membrane

  • Parietal layer
  • Visceral layer
• Directional terms precisely locate various parts of the body relative to one another