Muscles come in many shapes and sizes. They include:
Strap or flat type
Striated, which have cross-over sections in their fibers for added strength
Unstriated, which have no cross-sections. They are called smooth
muscles.
Spindle-shaped (triangular) muscles with a “fleshy” body and tapering at
one end like a “top”
Papillary muscles which are like columns supporting valves (heart)
Sphincter muscles—circular-type muscles which make up various
sphincters, including the stomach. Sphincter muscles also encircle
various ducts and orifices (anus, etc.).Muscles of the BodyANTIGRAVITY MUSCLES
Muscles that help support posture
AGONIST MUSCLES
Muscles that are the prime central movers
ANTAGONISTIC MUSCLES
Muscles that create opposing actions
BIPENNATE MUSCLES
Muscles with tendons
CARDIAC MUSCLES
Muscles of the heart
EXTENSOR MUSCLES
Muscles that extend a part
EXTRINSIC MUSCLES
Muscles located outside an organ that help hold its position
FIXATION MUSCLES
Muscle that holds (steadies) a part, so that more precise movements in a
related structure can take place
FLEXOR MUSCLES
Muscles that help to flex or bend parts