Humans detect taste with taste receptor cells. These are clustered in taste buds and scattered in other areas of the body. Each taste bud has a pore that opens out to the surface of the tongue enabling molecules and ions taken into the mouth to reach the receptor cells inside.1  salty.2  sour. 3  sweet. 4  bitter.5  umami.umans detect taste with taste receptor cells. These are clustered in taste buds and scattered in other areas of the body. Each taste bud has a pore that opens out to the surface of the tongue enabling molecules and ions taken into the mouth to reach the receptor cells inside. 1  salty. 2  sour. 3  sweet. 4  bitter. 5  umami.
Raynaud's Syndrome May be the Cause of Your Fiery Fingertips. Another major cause of burning fingertips is Reynaud's Syndrome. This condition is brought about when the blood vessels that supply the hands and/or feet narrow. In individuals with Reynaud's, episodes of burning fingertips are exacerbated by exposure to cold.
A person with a burning sensation of the extremities usually has irritation or inflammation of the skin, muscles, bones or joints in the arm. Simple extremity injuries such as muscle strains and ligament sprains may cause a burning sensation in the extremities. An infection of the skin called cellulitis can also cause a burning sensation of the extremities. Other important causes include peripheral vascular disease, peripheral neuropathy, diabetic nerve disease, multiple sclerosis, Raynaud's syndrome, drug side effect, disk disease in the neck, and herniated disk in the back.