Body Cavities and Membranes

Hi,

My name is Franz Devantier, creator of this blog.  I am an Herbalist, who uses local and indigenous herbs when available, in preference to imported herbs.  Because Herbalists deal with living human beings, it is important to have an understanding of Anatomy and Physiology, as well as many other related subjects, such as How to grow old gracefully with Stem Cell Enhancers.

Body Cavities and Membranes

Within the axial portion of the body there are two large cavities.  They are called the dorsal body cavity and the ventral body cavity.  Both of these cavities are closed to the outside, and each of them contains internal organs. 

Dorsal Body Cavity

The dorsal body cavity is sub-divided into two cavities.  The cranial cavity, the skull encases the brain.  The vertebral or spinal cavity, the bony vertebral column encases the delicate spinal cord.  The spinal cord issues from, and is essentially a continuation of the brain.  The cranial and spinal cavities are continuous with one another.  This gives some meaning to the way some people are humorously  described as; “sitting on their brain”, because if you are sitting half on your back, you are sitting on the continuation of your brain, your spinal cord.

The vital and very fragile nervous system organs are both housed by the dorsal body cavity.  The dorsal body cavity is well protected by the skull, and the bony vertebral column.  They are known as the dorsal body cavity, because the spinal cord is on the dorsal side of the body.  The brain is located more to the dorsal side of the skull, then the ventral side, to make space for the structures of the face.

Ventral Body Cavity

The ventral body cavity is larger than the dorsal body cavity, and is located more anterior in the body.  Consider that the ventral body cavity is located anterior to the dorsal body cavity.  The ventral body cavity has two major sub-divisions; the thoracic cavity, and the abdominopelvic cavity.  The ventral body cavity houses a group of internal organs that are collectively called the viscera, or visceral organs.

The superior sub-division is called the thoracic cavity.  The thoracic cavity is surrounded by the ribs and the muscles of the chest.  The thoracic cavity is further subdivided into two lateral pleural cavities.  Each pleural cavity houses a lung. The medial mediastinum, which is located between the two pleural cavities houses the pericardial cavity.  The pericardial cavity encloses the heart, and the remaining thoracic organs or viscera such as the esophagus and trachea.

The thoracic cavity is separated from the inferior abdominopelvic cavity by the diaphragm.  The diaphragm is a dome shaped muscle that is important in breathing.  The abdominopelvic cavity has two parts or regions, which are not separated by a muscular or membrane wall.

The superior portion of the abdominopelvic cavity is the abdominal cavity.  The abdominal cavity contains the stomach, intestines, spleen, liver, kidneys, pancreas and etc.  The inferior part or region the pelvic cavity contains the bladder, some of the reproductive organs, and the rectum.  The abdominal and pelvic cavities are not aligned with each other, because the bowl shaped pelvic region is tipped forward, away from the perpendicular. 

In a physical trauma such as a motor car accident, the most venerable abdominopelvic organs are those in the abdominal cavity.  This is because the organs in this region are only protected by the walls of the trunk muscles, and are not re-enforced by bone, as is the thoracic cavity.  Also the pelvic organs have better protection because the bony pelvis provides a degree of protection.    

Franz Devantier,

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