Muscle Shapes

fasicles parallel to longitudinal axis of muscle - terminate at either end in flat tendons

fascicles in concentric rings from sphincter muscles that enclose an oriface

fasicles nearly parallel to longitudinal axis of muscle - terminate in flat tendons - muscle is fat in middle and tapers toward tendons

fascicles spread over broad area converge at thick central tendon - gives muscle triangular appearance

• Pennate - short fasicles in relation to toal muscle length - tendon extends entire length of muscle
• Unipennate - fasicles arranged on one side of tendon
• Bipennate - fascicles on both sides of tendon
• Multipennate - fascicles attach obliquely from many directions to several tensons

Parallel to midline

perpendicular to midline

diagonal to midline

largest

smallest

long

short

widest

longest

Large

larger

smaller

huge

triangular

trapezoid

sawtoothed

diamond-shaped

cricular

comblike

pear-shaped

flat

square, four sided

slender

decreases joint angle

increases joint angle

moves a bone away from midline

moves bone toward midline

raises or elevates a body part

lowers a body part

turns palm anteriorly

turns a palm posteriorly

decreases the size of an opening

makes a body part rigid

rotates a bone around its longitudinal axis

two origins

three origins

four origins