Test your knowledge with these top questions!
Which ancestral feature does the coccyx preserve?
The coccyx descends from the vertebrae of an ancestral tail, although the modern structure is much smaller.
Why are human auricular muscles considered vestigial?
Auricular muscles in many mammals swivel the pinna, while human auricular muscles usually move the pinna only slightly.
Why can biologists call the human appendix vestigial without calling it useless?
The appendix lost much of an ancestral role, but its lymphoid tissue still supports gut immunity, so vestigial does not mean useless.
Wisdom teeth are another name for which teeth?
Wisdom teeth are the third molars, the rearmost permanent teeth in each side of the upper and lower jaws.
What does "vermiform" describe in the name "vermiform appendix"?
Vermiform combines Latin roots for worm and form, describing the appendix's narrow, curved shape.
Why are wisdom teeth often described as vestigial?
Vestigial does not mean useless or absent; it means a structure retains less of an ancestral function than it once did.
What term describes coccyx pain after a backward fall?
Direct falls onto the buttocks and prolonged sitting commonly trigger coccydynia; childbirth can also strain the coccyx.
Which auricular muscle retracts the human pinna?
The posterior auricular muscle draws the auricle backward; anterior and superior muscles draw the auricle forward or upward.
Which nerve supplies the human auricular muscles?
Temporal and posterior auricular branches of cranial nerve VII innervate the auricular muscles.
What function can healthy, fully erupted wisdom teeth provide?
Healthy, fully erupted wisdom teeth can contribute to grinding food, although they are not essential for most people.