Healthcare and Medicine Reference
In-Depth Information
The Spiral Line
trunk and leg to keep it from folding into rotational
collapse.
Overview
The Spiral Line (SPL) (Fig. 6.1) loops around the body
in a double helix, joining each side of the skull across
the upper back to the opposite shoulder, and then
around the ribs to cross in the front at the level of the
navel to the same hip. From the hip, the Spiral Line
passes like a 'jump rope' along the anterolateral thigh
and shin to the medial longitudinal arch, passing under
the foot and running up the back and outside of the
leg to the ischium and into the erector myofascia to
end very close to where it started on the skull.
The Spiral Line in detail
For convenience, we will change tactics to begin detail-
ing the SPL from the top, keeping in mind that in vivo
any of these lines can, and do, pull from either end (or
outward or inward) from nearly any place along their
length.
The SPL begins on the side of the skull, at or above
the lateral part of the nuchal line, at the junction between
the occiput and temporal bone, sweeping down and in
on the splenius capitis muscle. On its way, it picks up
the splenius cervicis, meeting the spinous processes
from C6 to T5 (Fig. 6.3A).
Crossing over the tips of the spinous processes with
a continuous facial sheet, we pick up the rhomboids
major and minor on the other side as part of the same
fabric (see Figs In. 10 and 2.7, pp 5 and 67). (We could
also imagine a mechanical link from the splenius to the
smaller serratus posterior superior which underlies the
rhomboids and attaches to the ribs just lateral to
the erectors - Fig. 6.3B). The rhomboids carry us along
the same line of pull over to the medial border of the
scapula, thus connecting the left side of the skull to the
right scapula and vice versa (Fig. 6.4).
From the medial border of the scapula, there is a
direct fascial connection to the infraspinatus and sub-
scapularis, which we will explore with the Arm Lines in
the next chapter. The SPL, however, continues on a less
obvious but nevertheless very strong fascial connection
with the serratus anterior, deep to the scapula (Fig. 6.5).
In dissections we have done, it seems that the connec-
tion of the rhomboids to the serratus anterior is stronger
and more 'meaty' than the connection of either muscle
to the scapula itself.
The rhomboids connect to a goodly portion of the
serratus, which is a complex muscle with many internal
Postural function
The SPL functions posturally to wrap the body in a
double spiral that helps to maintain balance across all
planes (Fig. 6.2A-C/Table 6.1). The SPL connects the foot
arches with the pelvic angle, and helps to determine
efficient knee-tracking in walking. In imbalance, the SPL
participates in creating, compensating for, and main-
taining twists, rotations, and lateral shifts in the body.
Depending on the posture and movement pattern, espe-
cially relative to the weighted and unweighted leg,
forces from the legs can travel up the same side or cross
to the opposite side of the body at the sacrum. Much of
the myofascia in the SPL also participates in the other
cardinal meridians (SBL, SFL, LL) as well as the Deep
Back Arm Line (see Ch. 7). This insures the involvement
of the SPL in a multiplicity of functions, and that dys-
function in the Spiral Line will affect the easy function-
ing of these other lines.
Movement function
The overall movement function of the SPL is to create
and mediate spirals and rotations in the body, and,
in eccentric and isometric contraction, to steady the
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