Healthcare and Medicine Reference
In-Depth Information
Fig. 7.23 The rotator cuff track of the DBAL connects to the triceps, with the proviso that the arm needs to be up at near horizontal or
above for this connection to be active. The DBAL runs from the triceps attachment at the olecranon of the elbow down the periosteum
of the ulna, across the outer edge of the wrist to the hypothenar muscles and the little finger. Compare to Fig. 7.18.
capsule of the wrist, specifically the ulnar collateral liga-
ment, outside the triquetral and hamate carpal bones
and onto the periostea and ligaments that run up the
little-finger side of the hand (Fig. 7.23). The hypothenai
muscles are part in this line (DVD ref: Shoulders and Arm
The DBAL, roughly equivalent to the Lateral Line in
the leg, works with the DFAL to adjust the angle of the
elbow, to limit or allow side-to-side movement of the
upper body when in a crawl position, and to provide
stability from the outside of the hand to the back of the
shoulder.
A judo roll
An aikido or judo roll traces along the DBAL. It starts
when the little-finger side of the hand makes contact
with the mat, passing along the shaft of the ulna, the
triceps, and the back of the shoulder (Fig. 7.24). (A full
roll will then continue along the Back Functional Line -
see Chs 8 and 10.) It is important to keep this line strong,
full, and round for a successful roll. Collapse anywhere
along the line can lead to injury.
Fig. 7.24 A judo roll runs right up the DBAL, from the outside of
the little finger to the rotator cuff, before continuing on the Back
Functional Line (see Ch. 8).
back and side-to-side planes, and also around their long
axes. And in both cases there is a precise arrangement of
muscles aligned and attached to power each of these
movements.
From the shaft of the humerus near the ball where the
rotator cuff attaches, and from the underside of the
glenum near the teres minor insertion, come the three
heads of the triceps brachii, the next track of this line
(Fig. 7.23). In the hanging arm, with a similar pattern to
the Deep Front Arm Line, the step from the rotator cuff
to the triceps involves a radical change of direction,
but with the shoulder abducted, as in a tennis backhand,
these two are fascially and mechanically linked.
The triceps carries us down (including the anconeus
along the way) to the tip of the elbow, the olecranon
of the ulna (DVD ref: Shoulders and Arm Lines, 1:09:58-
1:11:16). To keep going straight from here, we are stymied
if we look for a muscular connection, but not if we
look for a fascial one: the periosteum of the ulna passes
down the entire length of the outside of the lower arm
(DVD ref: Shoulders and Arm Lines, 1:11:17-1:13:04). As
with the DFAL, the DBAL is firmly fastened to the ulna
for the distal half of the ulna, for the same reasons of
stability.
The Superficial Back Arm Line
The Superficial Back Arm Line (SBAL) begins with the
wide sweep of the trapezius's axial attachments, from
the occipital ridge through the spinous process of T12.
These fibers converge toward the spine of the scapula,
the acromion of the scapula, and the lateral third of the
clavicle (Fig. 7.25 and DVD ref: Shoulders and Arm Lines,
49:25-53:25).
In fact, the specific connections here are interesting:
the thoracic fibers of the trapezius link roughly with the
posterior fibers of the deltoid; the cervical fibers of tra-
pezius link with the middle deltoid; and the occipital
fibers of trapezius link to the anterior deltoid (Fig. 7.26
and DVD ref: Shoulders and Arm Lines, 53:27-54:55).
Draping Figure 7.26 over a skeleton demonstrates that
the SBAL sweeps from the back of the skull over the
front of the shoulder and thence to the back of the arm,
a situation that often causes confusion, tightness, and
misuse across the anterior deltoid area and the under-
lying tissues if the shoulder is - and it frequently is - out
of easy balance.
All these trapezio-deltoid lines converge onto the
deltoid tubercle, where the fascial connection passes
under the brachialis muscle to blend with the fibers of
When we reach the ulnar styloid process on the
outside of the wrist, we can continue on the ligamentous
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