Webster's New World Medical Dictionary

muscle, abdominal
See 
abdominal muscle.
muscle, abductor
Any muscle that pushes away
from the midline of the body. For example, the
abductor muscles of the arms allow the arms to be
raised from one’s sides. Abductor muscles are
opposed by adductor muscles. To keep these simi-
lar-sounding terms straight, medical students learn
to speak of “A B ductors” versus “A D ductors.”
muscle, adductor
Any muscle that pulls inward
toward the midline of the body. For example, the
adductor muscles of the leg serve to pull the legs
together. Adductor muscles are opposed by abductor
muscles. To keep these similar-sounding terms
straight, medical students learn to speak of “A D
ductors” versus “A B ductors.”
muscle, central core disease of
See 
central
core disease of muscle.
muscle, infraspinatus
See 
infraspinatus
muscle.
muscle, papillary
A small muscle within the
heart that anchors the heart valves. The anchor
ropes are the chordae tendineae, thread-like bands
of fibrous tissue that attach on one end to the edges
of the tricuspid and mitral valves of the heart and on
the other end to the papillary muscles.
multiple symmetric lipomatosis
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muscle, piriformis
A muscle that begins at the
front surface of the sacrum (the V-shaped bone
between the buttocks, at the base of the spine) and
passes through the greater sciatic notch to attach to
the top of the thighbone (femur) at its bony promi-
nence (the greater trochanter). The gluteus max-
imus muscle covers the piriformis muscle in the
buttocks.