The symbolism of the all seeing eye represents the ability of an individual to perceive and influence the world through the eyes as well as the
It is an ability that we are all capable of if we dedicate our time to understanding anatomy.
I have explained before that "spiritual" truth can be achieved by mastering anatomy.
I have much more knowledge that I wish I could share but I will not until I can piece everything together.
I will share this.
The human hand and the brain are close partners in two
important and closely interconnected functions: exploration
of the physical world and reshaping of parts
of this world through manipulation. The highly
versatile functions of the human hand depend on both
its anatomical structure and the neural machinery that
supports the hand. This article focuses on the sensorimotor
control of hand movements in object manipulation–
a hallmark of skilled manual action. The
article also examines relationships between the two
main functions of the hand–object perception and
I. THE ACTING AND PERCEIVING HAND
Many of our cultural and technological achievements
that mark us as human depend on skilled use of the
hand. We use of our hands to gesture and communicate,
make and use tools, write, paint, play music,
and make love. Thus, the human hand is a powerful
tool through which the human brain interacts with the
world. We use our hands both to perceive the world
within our reach (haptic perception) and to act on this
world. These two functions of the hand, which are
largely accomplished by touching and manipulating
objects in our environment, are intimately related in
terms of sensorimotor control. Haptic perception
requires specific hand movements that are tailored to
the kinds of information the perceiver wishes to
extract. For example, to obtain information about
the texture of an object, people rub their fingertips
across the object’s surface, and to obtain information
about shape they trace the contour of the object with
their fingertips. Conversely, in object manipulation
sensory and perceptual information is critical for
precise motor control of the hands. The fact that
individuals with numbed digits have great difficulty
handling small objects even with full vision illustrates
the importance of somatosensory information from
To control both the exploratory and manipulatory
functions of the hand, the brain must obtain accurate
descriptions of various mechanical events that take
place when objects are brought into contact with the
Encyclopedia of the Human Brain Copyright 2002, Elsevier Science (USA).
Volume 2 399 All rights reserved.
hand. Mechanoreceptive (tactile) sensors in the glabrous
skin of the volar aspect of the hand play an
essential role in providing such information. The
density of mechanoreceptors increases in the distal
direction of the hand and is exquisitely high in the
fingertips. As a perceptual organ, the hand has several
advantages over the eyes. The hand can effectively ‘‘see
around corners,’’ allowing us to explore all sides of an
object, and it can directly appreciate object properties
such as weight, compliance, and slipperiness.
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