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
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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