Healthcare and Medicine Reference
In-Depth Information
Fig. 7.12 The pectoralis major is a principal player in the start of
the Superficial Front Arm Line.
ventri', a muscle on the front with a firm attachment to
the anterior surface of the humerus, next to pectoralis,
thus staking its tenuous claim to being part of the SFAL)
sweeps up from the spinous processes of the lower tho-
racics, the lumbosacral fascia, the iliac crest, and lower
lateral ribs (DVD ref: Lateral Line, 43:58-48:40). Between
the pectoralis major and the latissimus, the SFAL has
nearly an entire circle of attachments, reflecting the wide
degree of control the SFAL exerts on movement of the
arm in front of and to the side of the body (Fig. 7.13).
The latissimus picks up the teres major (another
crossover muscle - see discussion) from the lateral
border of the scapula, and all three of these muscles
twist and focus into bands of tendon which attach
alongside each other to the underside of the anterior
humerus (Fig. 7.14). These bands surround and connect
into the beginning of the medial intermuscular septum,
a fascial wall between the flexor and extensor group in
the upper arm, which carries us down to the next bony
station, the medial humeral epicondyle (Fig. 7.15 and
DVD ref: Shoulders and Arm Lines, 25:04-25:56).
The track of the common flexor tendon continues
down from the epicondyle, joining with the many-
layered longitudinal muscles on the underside of the
forearm (Fig. 7.16A and DVD ref: Shoulders and Arm
Lines: 25:56-27:40). The shorter of these muscles go to
the carpal bones; the flexor superficialis muscles go to
the middle of the fingers, and the profundus muscles
reach to the tips of the fingers. This breaks, we should
note, the usual pattern of having the deeper muscles be
the shorter (Fig. 7.16B). These muscles to the fingers run
through the carpal tunnel under the flexor retinaculum,
to spread out to the ventral carpals and the palm sides
of the fingers (Fig. 7.17 and DVD ref: Shoulders and Arm
Lines: 27:41-29:55).
As implied in our first paragraph, the SFAL controls
the positioning of the arm in its wide range of motions
in front of and beside us. The large muscles of the pec-
toralis and latissimus provide the motive force for the
large movements of adduction and extension, such as a
swimming stroke or a tennis smash or a cricket bowl.
By controlling the wrist and fingers, the SFAL partici-
pates with the DFAL in the grip. Although the author is
Fig. 7.13 Between the two triangular muscles - the pectoralis
major and latissimus dorsi - the SFAL has a broad origin around
the trunk from the clavicle (1) around the ribs to the pelvis (5) and
the thoracic spine (7).
Fig. 7.14 The latissimus dorsi and teres major, even though they
come from the back, are clearly connected into the same
functional myofascial plane as the pectoralis major.
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