tendinous intersections of the rectus abdominis m.
horizontal, across the rectus abdominis m. form the rippled appearance of the tensed abdomen in slender, highly-conditioned individuals
sheath of the rectus abdominis m.
a well-developed conn. t.p. envelope surrounds the muscle belly of rectus abdominis m.
the midline btwn the bellies of left/right rectus abdominis m
external abdominal oblique m.
the more superficial of the two abdominal oblique m.
from anterior aspect, fibers angle down and anteriorly in same general manner as those of the external intercostal mm. of the thorax.
ORIGIN: ribs 5-12INSERTION: anterior lamina of the sheath of rectus abdominis m. (and thence to the linea alba), anterior half of iliac crest (lateral aspect), inguinal ligament
ACTION: draw thorax downward (flex joints of vertebral column, compress abdomen), rotate vertebral column if contracted unilaterally
the inferior border of the abdominal aponeurosis thickens to form the inguinal ligament, which courses from the anterior superior ilia spine to the pubis tubercle
internal abdominal oblique m.
the deeper of the two abdominal oblique mm.
fibers are angled down and posteriory.
when this aponeurosis reaches the edge of the rectus abdominis muscle, IT SPLITS with one layer joining the anterior lamina and the other forming the poserior lamina of the sheath of the rectus abdominis m.
ORIGIN: anterior half of crest of ilium, lumbar fascia, iliac fascia, inguinal ligament
INSERTION: ribs 10-23, sheath of rectus abdominis m. (and thence to linea alba)
the muscles enclosing the floor of the pelvic cavity...
(btwn the pubes anteriorly and the ischiatic tubers posteriorly) are divided by position of the rectum into an anterior group comprising the urogenital diaphragm and a posterior group forming the pelvic diaphragm
mm. which form the anterior floor of the pelvic cavity
muscles which form the posterior portion of the pelvic floor
large triangluar m. that is located SUPERFICIALLY ON POSTERIOR ASPECT OF NECK AND UPPER BACK
name is derived from the diamond shape (trapezoid) formed by left and right muscles
ORIGIN: occipital bone, spinous processes of C7 and thoracic vertebrae
INSERTION: clavicle, spine and acromion of scapula
ACTION: draw head laterally or posteriorly, rotate scapula
latissimus dorsi m.
large, superficial muscle that ENVELOPES THE BACK FROM the level of deltoideus m. down to the os coxae
broadest m. of back; upper, medial portion is partly covered by trapezius m.
ORIGIN: spinous processes of lower 5 or 6 thoacic vertebrae, those of lumbar vert. and median sacral crest
INSERTION: w/ teres major m. into the medial border of intertubercular groove (crest of lesser tubercle) of humerus
ACTION: adduct limb @ shoulder joint, rotate limb medially at shoulder jt, extend shoulder jt.
*most powerful "pull-up" m.
Rhomboideus major m.
larger of 2 rhomboideus mm.
located DEEP TO TRAPEZIUS M. btwn the medial border of scapula and spinous processes of vertebrae