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Scan of Figure 2, from Darwin's Descent of Man, second edition, illustrating Darwin's tubercle. This atavistic feature is so called because its description was first published by Charles Darwin in the opening pages of The Descent of Man, and Selection in Relation to Sex, as evidence of a vestigial feature indicating common ancestry among primates which have pointy ears.
Around the sixth week of gestation, six swellings of tissue, called the hillocks of His, [a] arise around the area that will form the ear canal. [6] These eventually coalesce to form the outer ear. Darwin's tubercle is a minor malformation of the junction of the fourth and fifth hillocks of His. It is found in a substantial minority of people ...
Ear Infections: Bumps can sometimes be a sign of an ear infection, especially if accompanied by pain and fever. Folliculitis: Inflammation of the hair follicles can cause bumps that might be ...
The sudden startled arm-jerking response sometimes experienced when on the verge of sleeping is known as the hypnic jerk.. The evolutionary explanation for the existence of the hypnic jerk is unclear, but a possibility is that it is a vestigial reflex humans evolved when they usually slept in trees.
Goose bumps are accompanied by a specific physiological response pattern that is thought to indicate the emotional state of being moved. [15] In humans, goose bumps occur everywhere on the body, including the legs, neck, and other areas of the skin that have hair. In some people, they even occur in the face or on the head.
Look out for tongue bumps along with these 9 little body changes that could reveal a much bigger health problem. The worst case scenario… Although rare, bumps on the tongue could be a sign of ...
Each involves the external ear. The difference between them is that a cyst does not connect with the skin, but a sinus does. [3] Frequency of preauricular sinus differs depending the population: 0.1–0.9% in the US, 0.9% in the UK, and 4–10% in Asia and parts of Africa. [4]
Phrenology is a pseudoscience that involves the measurement of bumps on the skull to predict mental traits. [ 1 ] [ 2 ] It is based on the concept that the brain is the organ of the mind, and that certain brain areas have localized, specific functions or modules. [ 3 ]