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Anatomy & Physiology: Body Divisions, Cavities, and Planes

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  • What are the two major divisions of the body?

    Axial (head, neck, trunk) and Appendicular (limbs: arms and legs).

  • What does the axial division of the body include?

    The head, neck, and trunk.

  • What does the appendicular division of the body include?

    The limbs, which are the arms and legs.

  • What are regional terms used for in anatomy?

    To designate specific areas within the body divisions.

  • What is the sagittal plane?

    A vertical plane that divides the body into right and left parts.

  • What is a parasagittal plane?

    A vertical cut that is off-center, not on the midline.

  • What is the frontal (coronal) plane?

    A vertical plane dividing the body into anterior (front) and posterior (back) parts.

  • What are body cavities and their function?

    Internal spaces that are closed to the environment and provide varying degrees of protection to organs.

  • What are the two main body cavity sets?

    Dorsal body cavity and ventral body cavity.

  • What does the dorsal body cavity protect?

    The fragile nervous system.

  • What are the two subdivisions of the dorsal body cavity?

    Cranial cavity (encases brain) and vertebral cavity (encases spinal cord), both covered by meninges.

  • What does the ventral body cavity house?

    The internal organs (viscera).

  • What separates the two subdivisions of the ventral body cavity?

    The diaphragm.

  • What are the subdivisions of the thoracic cavity?

    Two pleural cavities (each surrounds a lung), mediastinum, and pericardial cavity (encloses the heart).

  • What organs are contained in the abdominal cavity?

    Stomach, intestines, spleen, and liver.

  • What organs are contained in the pelvic cavity?

    Urinary bladder, reproductive organs, and rectum.

  • What is the serosa (serous membrane)?

    Thin, double-layered membranes covering surfaces in the ventral body cavity.

  • What is the difference between parietal and visceral serosa?

    Parietal serosa lines cavity walls; visceral serosa covers internal organs.

  • What separates the two layers of serosa?

    A slit-like cavity filled with serous fluid secreted by both layers.

  • Name examples of serous membranes.

    Pericardium (heart), pleurae (lungs), and peritoneum (abdominopelvic cavity).

  • What are some smaller body cavities exposed to the environment?

    Oral and digestive cavities, nasal cavity, orbital cavities, and middle ear cavities.

  • What are synovial cavities?

    Joint cavities that are not exposed to the environment.

  • What are the four abdominopelvic quadrants?

    Right upper quadrant (RUQ), left upper quadrant (LUQ), right lower quadrant (RLQ), and left lower quadrant (LLQ).