Anatomical Terminology For Body Cavities
All vertebrates have fluid-filled spaces, which are called body cavities, and these cavities contain organs. The human also gave several body cavities, which are named anatomically according to the body organ and location where this cavity is found, such as a thoracic cavity, cranial cavity, and pelvic cavity.
These cavities also protect body organs. Here we will see the anatomical terms and anatomical planes of these body cavities.
What Does Ventricles Of The Brain Mean
cerebrospinal fluid The ventricles of the brain are a communicating network of cavities filled with cerebrospinal fluid and located within the brain parenchyma. The choroid plexuses are located in the ventricles produce CSF, which fills the ventricles and subarachnoid space, following a cycle of constant production and reabsorption.
Planes: Because Who Said Anatomy Didnt Require An Imagination
No, not the kind that fly you over oceans and have helpful people in uniforms that ply you with bags of stale peanuts. The other kind! The art kind, or in more technical terms the area of a two-dimensional surface. When used in conjunction with anatomy, planes are used to divide the body and its parts, which allows you to describe the views from which you study the body. If you look at your A& P textbook, youll most likely notice that a good number of the pictures and diagrams make use of planes.
Here is a list of commonly used planes:
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Abdominal And Pelvic Cavity
The lower part of the ventral cavity can be further divided into two portions: abdominal portion and pelvic portion. The abdominal cavity contains most of the gastrointestinal tract as well as the kidneys and adrenal glands. The abdominal cavity is bound cranially by the diaphragm, laterally by the body wall, and caudally by the pelvic cavity. The pelvic cavity contains most of the urogenital system as well as the rectum. The pelvic cavity is bounded cranially by the abdominal cavity, dorsally by the sacrum, and laterally by the pelvis.
Whysthe Thoracic Cavity Important
The heart should be unbroken in a very comparatively safe and stable position if its to continue beating and providing pressure to the bodys vessels. Additionally, to providing support, the skeletal structure functions in unison with the diaphragm and alternative muscles to draw air in and out of the lungs.
If any of the cavities close these important organs get perforated, the ensuing pressure will cause the lungs to collapse or pressure to be exerted on the center, which might cause a coronary failure .
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Body Cavities And Serous Membranes
The body maintains its internal organization by means of membranes, sheaths, and other structures that separate compartments. The dorsal cavity and the ventral cavity are the largest body compartments ). These cavities contain and protect delicate internal organs, and the ventral cavity allows for significant changes in the size and shape of the organs as they perform their functions. The lungs, heart, stomach, and intestines, for example, can expand and contract without distorting other tissues or disrupting the activity of nearby organs.
Subdivisions of the Posterior and Anterior Cavities
The posterior and anterior cavities are each subdivided into smaller cavities. In the posterior cavity, the cranial cavity houses the brain, and the spinal cavity encloses the spinal cord. Just as the brain and spinal cord make up a continuous, uninterrupted structure, the cranial and spinal cavities that house them are also continuous. The brain and spinal cord are protected by the bones of the skull and vertebral column and by cerebrospinal fluid, a colorless fluid produced by the brain, which cushions the brain and spinal cord within the posterior cavity.
Abdominal Regions and Quadrants
To promote clear communication, for instance about the location of a patients abdominal pain or a suspicious mass, health care providers typically divide up the cavity into either nine regions or four quadrants ).
Membranes of the Anterior Body Cavity
Flow Of Cerebrospinal Fluid
The ventricular system of the brain contains cerebrospinal fluid . The specialized structure, which is concerned with the production of CSF is known as, choroid plexus. This structure can be found in the lateral, third, and fourth ventricle of the brain. This structure contains the modified ependymal cells, which produce CSF. CSF flows from the lateral ventricles to the third ventricles, through the foramina of Monro or interventricular foramen and then into the fourth ventricle, through the cerebral aqueduct
From the fourth ventricle, it enters the central canal of the spinal cord and the cisterns of the subarachnoid space, through the median foramen of Magendie and the two lateral foramina of Luschka. Only a small amount of CSF enters the central canal. In the subarachnoid space, CSF is absorbed into the venous blood, by some specialized structures, known as arachnoid villi or arachnoid granulations. The arachnoid villi act as one-way valves, which allow CSF to pass into the bloodstream, when the pressure of CSF is higher than the venous pressure. But, they do not allow fluid to pass back into the subarachnoid space , when the venous pressure is greater than the CSF pressure.
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What Body Cavity Contains The Brain Is It In A Body Cavity
The cranial cavity
The brain sits in the intracranial space or cranial cavity . It is cushioned from the bone by three membranes and cerebrospinal fluid which also keeps it nourished.
The cavity is formed within the cranium which is made up of 8 bones, all fused together. These bones are: frontal bone, occipital bone, sphenoid bone, ethmoid bone, two parietal bones and two temporal bones.
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The Abdominal Cavity Of An Animal Body
This abdominal cavity is the largest among all the body cavities of an animal. It extends from the diaphragm to the pelvic inlet of an animal. Here, I will show you the structured involvement in forming the abdominal cavity with its contents.
So, lets see the structures that are involved to form the abdominal cavity in an animal
Roof the roof forms by the lumbar vertebrae, lumbar muscles and part of the diaphragm
Floor the floor of the abdominal cavity forms by the two recti muscles, aponeurosis of the muscles of the lateral abdominal walls and xiphoid cartilage.
Cranial wall forms by the concavity of the diaphragm
Caudal extremity continue with the pelvic cavity
Lateral wall form by the external and internal oblique muscles, transverse abdominal muscle, and some part of the few caudal ribs
You will find the parietal peritoneum that attaches to the abdominal wall with the help of subserous tissue. Again, the muscles are covered by a superficial and deep fascia.
The deep fascia is a sheet of elastic tissue and intimately attached to the extraneous oblique muscle. This is also known as an abdominal tunic that support the muscles to bear the weight of the abdominal viscera.
The three openings at the diaphragm pierce the abdominal cavity. These three openings are aortic aperture, oesophagal aperture, and vena cava aperture.
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What Is Thoracic Cavity
The Thoracic cavity is that the chamber of the body of vertebratesthat are protected by the pectoral wall . The central compartment of the thoracic cavity is the mediastinum. There is a unit of 2 openings of the thoracic cavity, a superior pectoral aperture called the pectoral recess and a lower inferior pectoral aperture called the pectoral outlet.
The thoracic cavity includes the tendons also because thevascular system that may be broken from injury to the rear , neck or the spine.
Understanding The Ventricular System
All the four ventricles of the human brain develop from the central canal of the embryonic neural tube, usually during the first trimester of pregnancy. All the ventricles, the lateral, the third, and the fourth ventricle, are joined to one another. The fourth ventricle narrows towards the posterior end of the body and continues with the central canal of the spinal cord. The right and left lateral ventricles are located deep within the cerebral hemisphere, just beneath the corpus callosum, while the third ventricle is located in the diencephalon, between the right and left thalamus.
The fourth ventricle on the other hand, is located posterior to the pons and upper half of the medulla oblongata. It is a diamond-shaped cavity, that connects with the subarachnoid space through the lateral foramen of Luschka and the median foramen of Magendie. The two lateral ventricles are connected to the third ventricle by the interventricular foramen, also known as foramina of Monro. Foramina of Monro is a narrow, oval-shaped opening, through which CSF flows from the lateral ventricles to the third ventricle.
The third ventricle then connects to the fourth ventricle through the cerebral aqueduct , which is a long, narrow, tube-like structure. Each of the lateral ventricles has three horns, the anterior or frontal horn, posterior or occipital horn, and inferior or temporal horn. The inside of the ventricles are lined by an epithelial membrane, known as ependyma.
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The Functions Of The Thoracic Cavity
It contains the lungs, the center, and lower airways
the heartthe tracheobronchial tree, the vessels transporting blood between the lungs and the heart, the good arteries transportation blood from the center out into general circulation, and therefore the major veins into that the blood is collected for transport back to the center. The center is roofed by a fibrous membrane sac known as the serosa/pericardium that blends with the trunks of the vessels running to and from the center. The thoracic cavity conjointly contains the gorge, the channel through that food is passed from the throat to the abdomen.
The bodily/chest cavity is lined with a membrane that exudes a skinny fluid. That portion of the chest membrane is named the Parietal Pleura. The membrane continues over the respiratory organ, wherever its known as the Visceral Pleura, and over a part of the gorge, the nice vessels, and the heart, because the mediastinal serous membrane, the mediastinum being the house and therefore the tissues and structures between the 2 lungs.
As a result of the gas pressure between the pleura and therefore the pleura is a smaller amount than that of the outer atmosphere, the 2 surfaces tend to the touch, friction between the 2 throughout the metabolism movements of the respiratory organ being eliminated by the lubricating actions of the humor fluid. The pleural cavity is that the house, once it happens, between the visceral pleura and the parietal pleura.
Minor Body Cavities In The Abdominal Region
You will also find some minor body cavities in the abdominal region of an animal. Lets know how these cavities form in the animal.
The peritoneum is a serous membrane that lines the abdominal wall and is reflected over the viscera. You will find a surface mesothelium covering and connective tissue framework in the composition of a peritoneum.
You will have two layers in the peritoneum the parietal and a visceral layer. The parietal peritoneum cover a large part of the inner surface of the organ from abdominal, pelvic, and scrotal cavities. Again, the visceral peritoneum covers the organs of the abdominal, pelvic, and scrotal cavities wholly or partly.
Sometimes you may hear about two terms retroperitoneal and intraperitoneal.
Retroperitoneal organs that lie against the wall of the abdominal or pelvic cavities and cover only one surface by peritoneum.
Intraperitoneal most organs project freely into the abdominal, pelvic, and scrotal cavities and receive nearly complete coverage of the peritoneum.
The oral cavity is an opening or space between the lips to the hard plate. The oral cavity of an animal divides into the vestibule and oral cavity proper.
The vestibule of the oral cavity is a space external to the teeth and gums and internal to the lips and cheeks. In addition, the oral cavity is proper bound dorsally by a hard plate and a small part of the adjacent soft palate.
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What Are The 7 Major Body Cavities
As I told you before, there are seven major body cavities in an animal. You will find cranial, thoracic, abdominal, pelvic, vertebral, orbital cavities in an animal. If you read the whole article, you will find an informative description about all these cavities from an animal with their contents.
So, I would like to request you to read the full article on the body cavity to get a basic idea.
What are the 4 major body cavities?
There are different major and minor cavities in the animal. Here, I will tell you the most important four cavities from an animal. The most important four body cavities of animals are cranial cavity, thoracic cavity, abdominal cavity, and pelvic cavity.
Body Cavities And Organs
Now, I will show you the boundary of all the major body cavities and organs from an animal. Make sure you know the anatomical facts of the animal skeleton and some other structures like a diaphragm, peritoneum, and others.
In each animal cavity, you will find the roof, floor, rostral wall, caudal wall, and lateral wall. You may also find the rostral opening and posterior opening in each cavity.
The cranial cavity of an animal is an oval elongated irregular structure that contains the brain. Again, the nasal cavity of an animal is an elongated structure bounded by some facial bones.
The thoracic cavity of an animal is cone-shaped and laterally compressed. In addition, the abdominal cavity of the animal is the largest cavity that extends from the diaphragm to the pelvic inlet.
The vertebral cavity contains the spinal cord and the roots of the spinal nerves of an animal. Most of the visceral organs of the animal body are covered by the peritoneum. You will find two layers of the peritoneum a parietal and one visceral layer. The cavity in between the parietal and visceral layers of the peritoneum is known as the peritoneal cavity.
Again, the heart is covered by the pericardial covering, where you will also find two layers. These two layers of the pericardium also form the pericardial cavity. You will also find a pleural cavity in the covering of the animal lung.
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Are The Kidneys In The Peritoneal Cavity
For example, a kidney is inside the abdominal cavity, but is retroperitonealâlocated outside the peritoneum. … The potential space between these two layers is the peritoneal cavity. It is filled with a small amount of slippery serous fluid that allows the two layers to slide freely over each other.
What Body Are Cavities Located Superior To The Diaphragm
The cavity that locates superior to the diagram is the thoracic cavity. Some important organs like the heart, lung, parts of the aorta, cranial and caudal vena cava are present within this thoracic body cavity of an animal.
What are the major body cavities and their organs?
Are organs inside body cavities?
What are the main body cavities?
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Overview Of The Axial Skeleton
What Is The Function Of The Body Cavities
The body cavities house and protect the internal organs. There are two main body cavities: the dorsal cavity and the ventral cavity. The dorsal or posterior cavity contains the cranial cavity and the spinal cavity. The cranial cavity houses and protects the brain, while the spinal cavity houses and protects the spinal cord.
The ventral or anterior cavity is separated into the thoracic cavity and abdominopelvic cavity. The thoracic cavity contains the heart and lungs. It is protected by the rib cage. The abdominopelvic cavity is further divided into the abdominal cavity and the pelvic cavity. The stomach, intestines, liver, gall bladder, pancreas, spleen, and kidneys are in the abdominal cavity. The urinary bladder, internal reproductive organs, sigmoid colon, and rectum are in the pelvic cavity.
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Structure Of The Animal Nasal Cavity
Each nasal cavity of an animal is filled largely by the ventral nasal conchae rostrally and ethmoturbinates caudally. You will find three nasal conchae in the nasal cavity of an animal.
- A dorsal nasal concha
- The ventral nasal concha, and
- A middle nasal concha
Another name of the dorsal nasal concha is nasoturbinate. It is a curved shelf of bone that protrudes from the ethmoidal crest into the dorsal part of the nasal cavity.
Again, another name of the ventral nasal concha is maxilloturbinate that protrudes from the choncal crest into the nasal cavity. The basal lamina of the ventral nasal concha curves medially and ventrally into the cavity.
The conchae divide the nasal cavity into four primary passages . The dorsal nasal meatus locates between the dorsal nasal chocha and the nasal bone. Again, the middle nasal meatus locates between the dorsal nasal concha and ventral nasal concha.
In addition, the ventral nasal meatus locates between the ventral nasal concha and dorsum of the hard plate. You will also find the common nasal meatus in the longitudinal space between the conchae and nasal septum.
There is another nasopharyngeal meatus present in the nasal cavity that is responsible for air passage. This meatus extends from the caudal end of the ventral and common nasal meatus to the concha.
Quick Recap On Body Cavities And Membranes
That wraps up the major body cavities and membranes. To recap, there are two major cavities in the body: the dorsal cavity and the ventral body cavity. The dorsal is divided into the cranial cavity, which contains the brain, and the vertebral cavity, which contains the spinal cord.
The ventral body cavity can also be divided into two portions: thoracic cavity, and the abdominopelvic cavity. The thoracic cavity contains the left pleural cavity, right pleural cavity, and the mediastinum, which contains the pericardial cavity that surrounds the heart, along with other organs.
The abdominopelvic cavity can be subdivided into two additional cavities : abdominal and pelvic cavities, which not only contains various digestive and reproductive organs, but also contains the peritoneal cavity.
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