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Anatomy & Physiology: Directional Terms, Cavities, Regional Terms, and Body Systems

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  • Superior (cranial)

    Means toward the head or upper part of a structure.

  • Inferior (caudal)

    Means away from the head or toward the lower part of a structure.

  • Anterior (ventral)

    Means toward the front of the body.

  • Posterior (dorsal)

    Means toward the back of the body.

  • Medial

    Means toward the midline of the body.

  • Lateral

    Means away from the midline of the body.

  • Proximal

    Means closer to the origin of a body part or point of attachment.

  • Distal

    Means farther from the origin of a body part or point of attachment.

  • Superficial (external)

    Means toward or at the body surface.

  • Deep (internal)

    Means away from the body surface; more internal.

  • Dorsal body cavity

    Includes the cranial cavity and vertebral (spinal) cavity, housing the brain and spinal cord.

  • Ventral body cavity

    Includes the thoracic cavity and abdominopelvic cavity, housing organs like the heart, lungs, digestive organs.

  • Thoracic cavity

    Part of the ventral cavity containing the lungs and heart, separated by the mediastinum.

  • Abdominal cavity

    Part of the abdominopelvic cavity containing digestive organs like stomach, liver, intestines.

  • Pelvic cavity

    Part of the abdominopelvic cavity containing the bladder, reproductive organs, and rectum.

  • Right hypochondriac region

    Upper right region of the abdomen, below the ribs.

  • Epigastric region

    Upper central region of the abdomen above the stomach.

  • Left hypochondriac region

    Upper left region of the abdomen, below the ribs.

  • Right lumbar region

    Middle right region of the abdomen near the waist.

  • Umbilical region

    Central region of the abdomen around the navel.

  • Left lumbar region

    Middle left region of the abdomen near the waist.

  • Right iliac (inguinal) region

    Lower right region of the abdomen near the groin.

  • Hypogastric (pubic) region

    Lower central region of the abdomen below the navel.

  • Left iliac (inguinal) region

    Lower left region of the abdomen near the groin.

  • Integumentary system

    Protects body, regulates temperature, and provides sensory information; includes skin, hair, nails.

  • Skeletal system

    Supports and protects the body, provides muscle attachment, and produces blood cells; includes bones and joints.

  • Muscular system

    Allows movement, maintains posture, and produces heat; includes skeletal muscles.

  • Nervous system

    Controls body activities with electrical signals; includes brain, spinal cord, and nerves.

  • Endocrine system

    Secretes hormones to regulate body processes; includes glands like thyroid and adrenal.

  • Cardiovascular system

    Transports nutrients, gases, and wastes; includes heart and blood vessels.

  • Lymphatic system

    Returns fluid to blood, defends against infection; includes lymph nodes and vessels.

  • Respiratory system

    Supplies oxygen and removes carbon dioxide; includes lungs and airways.

  • Digestive system

    Breaks down food and absorbs nutrients; includes stomach, intestines, liver.

  • Urinary system

    Eliminates waste and regulates water balance; includes kidneys and bladder.

  • Reproductive system

    Produces offspring; includes testes and ovaries.