Muscles · Anatomical variationAbsent palmaris longus
A slender forearm muscle with a long tendon toward the palm is absent in some people without loss of function.
Frequency: Varies by individualMuscles
Muscles · Anatomical variation
Muscles · Anatomical variationAbsent plantaris
A variable small calf muscle that is absent in some people.
Frequency: Varies by individual
Muscles · PerceptionDelayed onset muscle soreness
Muscle pain and stiffness hours to days after unfamiliar exertion.
Frequency: Common
Muscles · Involuntary responseMuscle tremor after exertion
Fine involuntary oscillations during or after muscle exertion.
Frequency: Common
Muscles · Involuntary responseEyelid twitching
Fine, involuntary twitching of an eyelid.
Frequency: Common
Muscles · Involuntary responseFasciculations
Visible twitching of small muscle bundles beneath the skin.
Frequency: Common
Muscles · Involuntary responseMuscle cramp
Sudden painful involuntary muscle contraction.
Frequency: Common
Muscles · ReflexStretch reflex
A muscle contracts automatically after a rapid stretch.
Frequency: Common
Muscles · ReflexCrossed extensor reflex
A painful stimulus bends one side and extends the other.
Frequency: Common
Muscles · ReflexPlantar reflex
Movement of the toes after stimulation of the sole of the foot.
Frequency: Common
Muscles · Body trickEar wiggling
Voluntary movement of the outer ear in a minority of people.
Frequency: Frequency unclear
Muscles · Body trickTongue rolling
Muscle coordination shapes the tongue into a tube or fold.
Frequency: Varies by individualSurprisingly quiet here.
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