tresses and upholstered furniture are quilted
or otherwise fastened to prevent slippage of
the filler.
In the hand, the volar skin is tied down by
white fibrillar tissue connecting the sheaths of
the flexor tendons to the deep layer of the
dermis along the lateral and lower edges of the
palmar fascia. The folds therefore vary with
the relative lengths
of the metacarpal
bones and with the
mutual relations of
the sheaths of the
tendons and the
edge of the palmar
fascia.
The sulci, or furrows,
are emphasized
because the subcutaneous
fat in any
given area is restricted
to the interval
between the lines
along which the skin
is tied down. Thus
pressure upon any
individual monticulus
cannot displace
the underlying
soft tissue beyond
the boundaries established
by the
fibrillar connections.
The relative size of
any particular eminence
is an indication
of the size of
the muscle involved
and of its relative
development
through usage, with
the exception that
the size of the hypothenar
eminence
depends in part upon
the prominence of
the pisiform.