cavity

Examples of cavity in the following topics:

• Body Cavities

  • Blood vessels are not considered cavities but may be held within cavities.
  • The dorsal cavity is a continuous cavity located on the dorsal side of the body.
  • The abdominoplevic cavity is the posterior ventral body cavity found beneath the thoracic cavity and diaphragm.
  • Humans have multiple body cavities, including the cranial cavity, the vertebral cavity, the thoracic cavity (containing the pericardial cavity and the pleural cavity), the abdominal cavity, and the pelvic cavity.
  • In mammals, the diaphragm separates the thoracic cavity from the abdominal cavity.

• Animal Body Planes and Cavities

  • In the posterior cavity, the cranial cavity houses the brain and the spinal cavity (or vertebral cavity) encloses the spinal cord.
  • The anterior cavity has two main subdivisions: the thoracic cavity and the abdominopelvic cavity.
  • The thoracic cavity contains the pleural cavity around the lungs and the pericardial cavity, which surrounds the heart.
  • The abdominopelvic cavity is the largest cavity in the body.
  • The ventral cavity, indicated in yellow, contains the thoracic cavity and the abdominopelvic cavity.

• Serous Membranes

  • The pericardial cavity (surrounding the heart), pleural cavity (surrounding the lungs), and peritoneal cavity (surrounding most organs of the abdomen) are the three serous cavities within the human body.
  • Serous membranes line and enclose several body cavities, known as serous cavities, where they secrete a lubricating fluid which reduces friction from muscle movement.
  • The pericardial cavity (surrounding the heart), pleural cavity (surrounding the lungs) , and peritoneal cavity (surrounding most organs of the abdomen) are the three serous cavities within the human body .
  • While serous membranes have a lubricative role to play in all three cavities, in the pleural cavity it plays a greater role in the function of breathing.
  • Describe the function of the serous membranes in the pericardial, pleural, and peritoneal cavities

• Serosa

  • Serous membranes line and enclose several body cavities, known as serous cavities, where they secrete a lubricating fluid that reduces friction from muscle movement.
  • The pericardial cavity (surrounding the heart), pleural cavity (surrounding the lungs) and peritoneal cavity (surrounding most organs of the abdomen) are the three serous cavities within the human body.
  • While serous membranes have a lubricative role to play in all three cavities, in the pleural cavity it has a greater role to play in the function of breathing.
  • Early in embryonic life, visceral organs develop adjacent to a cavity and invaginate into the bag-like coelom.
  • Therefore each organ becomes surrounded by serous membrane - they do not lie within the serous cavity.

• The Mechanics of Human Breathing

  • The thoracic cavity, or chest cavity, always has a slight, negative pressure which aids in keeping the airways of the lungs open.
  • This decrease of pressure in the thoracic cavity relative to the environment makes the cavity pressure less than the atmospheric pressure .
  • During exhalation, the diaphragm also relaxes, moving higher into the thoracic cavity.
  • This increases the pressure within the thoracic cavity relative to the environment.
  • A tissue layer called pleura surrounds the lung and interior of the thoracic cavity.

• Bilaminar Embryonic Disc Development

  • The floor of the amniotic cavity is formed by the embryonic disc.
  • The floor of the amniotic cavity is formed by the embryonic disc, which is composed of a layer of prismatic cells and the embryonic ectoderm.
  • As the embryo progresses in implantation, a small space appears in the embryoblast and forms the amniotic cavity.
  • The epiblast forms the floor of the amniotic cavity and is continuous with the amnion.
  • The hypoblast forms the roof of the exocoelomic cavity and is continuous with the thin exocoelomic membrane.

• Inspiration

  • Inspiration begins with the contraction of the diaphragm, which results in expansion of the thoracic cavity and the pleural cavity.
  • As the volume of air inside the lung increases, the lung pushes back against the expanded pleural cavity as a result of the drop in intrapleural pressure (pressure inside the pleural cavity).
  • External intercostal muscles: muscles located in between the ribs that help the thoracic cavity (and thus pleural cavity) to expand during quiet and forced inspiration.
  • The accessory muscles assist breathing by expanding the thoracic cavity in a similar way to the diaphragm.
  • However, they expand a much smaller part of the thoracic cavity compared to diaphragm.

• Development of the Central Nervous System

  • The CNS is contained within the dorsal cavity, with the brain in the cranial cavity and the spinal cord in the spinal cavity.
  • The telencephalon differentiates into, among other things, the striatum, the hippocampus, and the neocortex, and its cavity becomes the first and second ventricles.
  • Diencephalon elaborations include the subthalamus, hypothalamus, thalamus, and epithalamus, and its cavity forms the third ventricle.
  • The tectum, pretectum, cerebral peduncle, and other structures develop out of the mesencephalon, and its cavity grows into the mesencephalic duct (cerebral aqueduct).
  • The metencephalon becomes, among other things, the pons and the cerebellum; the myelencephalon forms the medulla oblongata; and their cavities develop into the fourth ventricle.

• Development of the Extraembryonic Coelom

  • The extraembryonic coelum is a cavity which ultimately contains the chorion.
  • The extraembryonic coelum (or chorionic cavity) is a portion of the conceptus consisting of a cavity between Heuser's membrane and the trophoblast .
  • The extraembryonic coelumic cavity is also called the chorionic cavity, and is enclosed by the chorionic plate.
  • Artificially colored image of contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography.

• Orbits

  • The orbit is the cavity or socket of the skull in which the eye and its appendages are situated.
  • The orbit, or eye socket, is the cavity located in the skull in which the eye and its associated appendages are housed.
  • The orbits are conical, sometimes described as four-sided pyramidal, cavities that open in the midline of the face and point backwards.
  • The orbital cavity is formed from seven bones.