The human foot and the human handHumphry, George Murray, Sir
Science
The human foot and the human hand
Humphry, George Murray, Sir
Foot; Hand
The RING-FINGER has less independent movement than either of the
others. It cannot be bent or straightened much without being
accompanied by one or both of those next it. This is, partly, because
its extensor tendon is connected, by means of a band of fibres, with
the tendon on either side of it. You may discern these connecting bands
working up and down under the skin of the back of your hand when you
move the fingers to and fro (they are represented in fig. 67).
The ring-finger is, therefore, always, more or less, protected by the
other fingers; and it owes to this circumstance a comparative immunity
from injury, as well, probably, as the privilege of being especially
selected to bear the ring in matrimony. The left hand is chosen for a
similar reason; a ring placed upon it being less likely to be damaged
than it would be upon the right hand.
Other reasons have been given for this preference. It has been
attributed to a notion among the ancients that the ring-finger is
connected with the heart by means of some particular nerve or vessel,
which renders it a more favourable medium than the other fingers for
the reception and transmission of sympathetic impressions; the left
hand being selected, in preference to the right, because it lies rather
nearer to the heart.
[Illustration: Fig. 69. Nerves of hand.]
Some slight foundation for such a notion might be imagined to exist
in the fact (supposing the ancients to have been acquainted with it)
that the distribution of the nerves to the ring-finger is rather
peculiar. The peculiarity will be readily understood by reference
to the accompanying drawing (fig. 69). Two chief nerves are
seen descending, in their course from the brain, along the arm and
forearm, to supply sensation to the palmar surface of the hand. One
(A), the larger of the two, passes in front of the middle of the
wrist, and divides into branches which are distributed to the skin of
the thumb, of the fore and middle fingers, and of the _out_er side
of the ring-finger. The other nerve (B) lies on the _in_ner side of
the forearm and wrist, and its branches go to the skin of the little
finger, and of the inner side of the ring-finger. You see, therefore,
that there is, in this finger, a meeting of the branches of the two
nerves; the two sides of the finger being supplied by different
nerves. It would be a mistake, however, to suppose that it gains
any superiority in sensitiveness or sympathetic relations by this
arrangement; and this distribution of the nerves certainly does not
offer so probable an explanation of the selection of that finger for
the honourable office of ring-bearer as the one I have suggested.
Public-domain text, read in full here on John Shaqi.
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