10 most difficult human anatomy riddles

The number on the bottom eyelid is significantly lower - about 50-150.

The gut–brain axis is the biochemical signaling that takes place between the gastrointestinal tract and the central nervous system. Changes in the composition of the gut flora due to diet, drugs, or disease correlate with changes in levels of circulating cytokines, some of which can affect brain function. The gut flora also release molecules that can directly activate the vagus nerve. Around 70% of people with autism also have gastrointestinal problems, indicating that there may be a connection between autism and gut flora.

Synapsids were the largest terrestrial vertebrates in the Permian period, 299 to 251 million years ago, although some of the larger pareiasaurs at the end of Permian could match them in size.

Pepsi Cola, first introduced in 1898, was named after pepsin (enzyme) and kola (nuts). In 1931, the company entered bankruptcy and changed hands. The new owners changed the recipe to resemble more Coca-Cola.

The cerebellum (Latin for "little brain") is a major feature of the hindbrain of all vertebrates. In humans, the cerebellum plays an important role in motor control. It may also be involved in some cognitive functions such as attention and language as well as in regulating fear and pleasure responses. Based on the surface appearance, three lobes can be distinguished within the cerebellum: the anterior lobe (above the primary fissure), the posterior lobe (below the primary fissure), and the flocculonodular lobe (below the posterior fissure).

Tokophobia often leads patients to ask for a Caesarean section. Frequency of appearing: 6-10% pregnancies.

The human foot consists of 26 bones and 33 joints.

In the hypothalamus, oxytocin is made in magnocellular neurosecretory cells of the supraoptic and paraventricular nuclei, and is stored in Herring bodies at the axon terminals in the posterior pituitary. It is then released into the blood from the posterior lobe (neurohypophysis) of the pituitary gland.

Andreas Vesalius was a Belgian born anatomist and physician, born in 1514 into a family of physicians. He is considered the father of modern anatomy and his work the beginning of modern medicine. In 1543, at the young age of 29, Vesalius published his most important work, De Humani Corporis Fabrica Libri Septem (Seven Books on the Fabric of the Human Body), generally known as the Fabrica. The Fabrica is the most famous anatomy book ever written and also the first book on human anatomy to be reasonably accurate.

The filiform papillae are the most numerous of the lingual papillae. They are responsible for giving the tongue its texture and the sensation of touch. Unlike the other kinds of papillae, they do not contain taste buds.