Shape (eg. deltoid = triangle; trapezium = trapezoid) and relative size (eg. Maximus = largest, minimus = smallest, longus = long)

Direction of fibers or fascicles - eg. Rectus (fibers run straight), transversus and oblique (fibers run at angles to an imaginary defined axis) and ACTION (eg. flexor or extensor = muscles that flex or extend)

Location (eg. Bone or body region associated with the muscles) and number or origins (eg. biceps = 2 origins, triceps = 3 origins)

All of the above plus location of attachments (named according to point of origin or insertion)

Circular and convergent

Parallel and fusiform

Unipennate, Bipennate, Multipennate

All of the above

Fascicles arranged in concentric rings (e.g., orbicularis oris)

Fascicles converge toward a single tendon insertion (e.g., pectoralis major)

Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)

Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)

Fascicles converge toward a single tendon insertion (e.g., pectoralis major)

Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)

Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)

Short fascicles attach obliquely to a central tendon running the length of the muscle
(e.g., rectus femoris)

Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)

Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)

Fascicles converge toward a single tendon insertion (e.g., pectoralis major)

Short fascicles attach obliquely to a central tendon running the length of the muscle
(e.g., rectus femoris)

Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)

Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)

Short fascicles attach obliquely to a central tendon running the length of the muscle
(e.g., rectus femoris)

Fascicles converge toward a single tendon insertion (e.g., pectoralis major)

Short fascicles attach obliquely to a central tendon running the length of the muscle
(e.g., rectus femoris)

Spindle-shaped muscles with parallel fibers (e.g., biceps brachii)

Fascicles parallel to the long axis of a straplike muscle (e.g., sartorius)

Fascicles converge toward a single tendon insertion (e.g., pectoralis major)

Orbicularis oris (sphincter muscle that encircles the mouth)

Pectoralis major (large muscle of the chest)

Sartorius (flexing muscle in the anterior compartment of the thigh)

Biceps brachii (major flexor at the elbow)

Orbicularis oris (sphincter muscle that encircles the mouth)

Pectoralis major (large muscle of the chest)

Sartorius (flexing muscle in the anterior compartment of the thigh)

Biceps brachii (major flexor at the elbow)

Orbicularis oris (sphincter muscle that encircles the mouth)

Pectoralis major (large muscle of the chest)

Sartorius (flexing muscle in the anterior compartment of the thigh)

Biceps brachii (major flexor at the elbow)

Orbicularis oris (sphincter muscle that encircles the mouth)

Pectoralis major (large muscle of the chest)

Sartorius (flexing muscle in the anterior compartment of the thigh)

Biceps brachii (major flexor at the elbow)

Biceps brachii (major flexor at the elbow)

Extensor digitorum longus (extends lateral four toes and dorsiflexes foot)

Rectus femoris (flexes the thigh at the hip joint and extends leg at the knee joint)

Deltoid (Muscle in shoulder joint and the major abductor of the arm)

Biceps brachii (major flexor at the elbow)

Extensor digitorum longus (extends lateral four toes and dorsiflexes foot)

Rectus femoris (flexes the thigh at the hip joint and extends leg at the knee joint)

Deltoid (Muscle in shoulder joint and the major abductor of the arm)

Biceps brachii (major flexor at the elbow)

Extensor digitorum longus (extends lateral four toes and dorsiflexes foot)

Rectus femoris (flexes the thigh at the hip joint and extends leg at the knee joint)

Deltoid (Muscle in shoulder joint and the major abductor of the arm)