Healthcare and Medicine Reference
In-Depth Information
Summary overview - fascia/muscle
alternation
fascially, and the two deep lines more muscularly (Fig.
7.30).
In the lower arm and hand, the arrangement is still
quadrate, but the expression is reversed: the two super-
ficial lines include many muscles, the two deep lines are
almost purely fascial (Fig. 7.31). In the hand, the muscles
of the two superficial lines become tendinous (although
some intrinsic muscles of the hand could be included in
our thinking here). The two deep lines include the thenar
and hypothenar muscles covering the flexor retinacu-
lum as indicated.
Thus are the four arm lines arranged along the various
aspects of the arm. In the shoulder, the lines are clearly
arranged superficial and deep on the front and back of
the rib cage, and it is from this cross-section that they
derive their names (see Fig. 7.3).
In the upper arm, the four lines surround the humerus
in a quadrant, the two superficial lines are represented
Fig. 7.30 In the upper
arm, the two deep
lines are muscular and
the superficial lines are
purely fascial.
Superficial Front Arm Line
Carpal tunnel
Deep Back Arm Line
Deep Front Arm Line
Fig. 7.31 In the lower
arm, the two
superficial lines are
muscular, while the
two deep lines are
purely fascial.
Superficial Back Arm Line
Extensor group
POSTERIOR
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