Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Muscle, papillary: Small muscles within the heart
that anchor 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
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 thigh bone (femur) at its bony prominence called the greater trochanter. The gluteus...
Muscle, psoas: Muscles of the lower back (the loin). There are two psoas muscles on each side of the back. The larger of the two is called the psoas major and the smaller the psoas minor.
The psoas major originates at the spine around the bottom of the rib cage and runs down to the thigh bone (the ...
Muscle, subscapularis: A muscle that moves the arm by
turning it inward (internal rotation).
The tendon of the subscapularis muscle is one of four tendons that
stabilize the shoulder joint and constitute the rotator cuff. Each of
these four tendons hooks up to a muscle that moves the shoulder in...
Muscle, supraspinatus: A muscle that is responsible for
elevating the arm and moving it away from the body.
The tendon of the supraspinatus muscle is one of four tendons that
stabilize the shoulder joint and constitute the rotator cuff.
Each of the four tendons of the rotator cuff hooks up to a...
Muscle, teres minor
Muscle, teres minor: A muscle that assists the lifting of the arm during outward turning (external rotation) of the arm.
The tendon of the teres minor muscle is one of four tendons that stabilize the shoulder joint and constitute the rotator cuff. Each of these four tendons hooks up to a muscle tha...
Muscles, abdominal: A large group of muscles in the front of the
abdomen that assists in
the regular breathing movement and supports the muscles of the spine while
lifting and keeping abdominal organs such as the intestines in place. Abdominal
muscles play a key role in exercises such as "sit-up...
Muscular: Having to do with the muscles. Also, endowed
with above average muscle development. Muscular system refers to all of the muscles of the
Muscular atrophy, post-polio (PPMA)
Muscular atrophy, post-polio (PPMA): Late muscle wasting that occurs as part of the post-polio syndrome (PPS), a constellation of symptoms and signs that appear belatedly, from 20 to 40 years, after the initial polio infection and at least 10 years after what was once thought to be the "recovery" fr...
Muscular dystrophy: One of a group of genetic diseases characterized by progressive weakness and degeneration of the skeletal or voluntary muscles which control movement. The muscles of the heart and some other involuntary muscles are also affected in some forms of muscular dystrophy, and a few form...
Muscular dystrophy, Becker
Muscular dystrophy, Becker: A form of muscular dystrophy that is quite similar to Duchenne muscular dystrophy, except that patients with Becker do produce some of the key protein, dystrophin, whereas those with Duchenne do not. Progression of the disease in Becker type is slower than in Duchenne,
Muscular dystrophy, congenital
Muscular dystrophy, congenital: A form of
muscular dystrophy that is present at birth. Various types
of congenital MD have been identified, each caused by a
different genetic error. Congenital MD can affect males or
females. Diagnosis is initially by observation of general
muscle weakness (hypo...
Muscular dystrophy, distal
Muscular dystrophy, distal: One of two genetic muscle diseases characterized by wasting of the muscles most distant from the midline, such as those of the hands and feet. Both types of distal MD are inherited in an autosomal dominant manner and may affect males and females.
The first type of distal ...
Muscular dystrophy, Emery-Dreifuss
Muscular dystrophy, Emery-Dreifuss: Abbreviated EDMD. A form of muscular dystrophy that begins in childhood or adolescence as a slowly progressive disorder of the upper arms or upper legs characterized by weakness and atrophy of muscles without involvement of the nervous system. Contractures of the ...
Muscular dystrophy, facioscapulohumeral
Muscular dystrophy, facioscapulohumeral: A form
of muscular dystrophy that begins before age 20 with slowly progressive weakness of the muscles of the face, shoulders, and feet. The severity of the disease is variable. Although most people with facioscapulohumeral muscular dystrophy (FSHD) retain t...