Something in the knee
In November, Belgian researchers described for the first time a ligament in the human knee, called the anterolateral ligament.
In another surprising discovery of a new body part, researchers found a previously unknown layer in the human eye. The thin, tough structure, called Dua’s layer, is only one-millionth of a meter thick, and sits behind the cornea.
People normally have 12 ribs on each side, but some people have an extra rib, which can cause health issues. The additional rib is called a cervical rib, and is found in up to 3 percent of people. This rib grows from the base of the neck just above the collarbone.
Cats, dogs and some lucky people are able to wiggle their ears, using a group of muscles called auriculares. Although we all have these muscles, it is thought that only some 15 percent of the population is able to use them to wiggle their ears.
Cuticles are the layer of hard skin at the bottom of the nails, where the nails and fingers meet. These little body parts prevent bacteria and dirt from entering the body.
The floating hyoid bone
The hyoid bone is the only bone in the body that is not connected to any other, and is the foundation of speech. The bone works with the larynx (voice box) and tongue to produce vocalizations.
The tailbone, or the coccyx, is leftover from a tail. Do we need it? There have been a bunch of medical cases where the tailbone has been surgically removed with no negative consequences.
Adults have fewer bones than a baby. We start life with 350 bones, but because some bones fuse together during growth, we end up with only 206 as adults.
We get a new stomach every three to four days. That’s because the lining of our stomach is continually replaced by new cells. In fact, the stomach constantly builds new layers so that the organ doesn’t get digested by its own acid.
The philtrum is the groove in the middle area of the upper lip. In some animals, it may have improved the sense of smell by keeping the area around the nose wet, but in humans, the philtrum has no apparent function.