In medicine, the bottom or base of an organ. For example, the fundus of the eye is the retina. However, the fundus of the stomach is inexplicably the upper portion. From the Latin for 'the bottom.'

The interior lining of the eyeball, including the retina (the light-sensitive screen), optic disc (the head of the nerve to the eye), and the macula (the small spot in the retina where vision is keenest). The fundus is the portion of the inner eye that can be seen during an eye examination by looking through the pupil. "Fundus" is the Lat [..]

The larger part of a hollow organ that is farthest away from the organ's opening. The bladder, gallbladder, stomach, uterus, eye, and cavity of the middle ear all have a fundus.

"bottom, depths; base of an organ," 1754, from Latin fundus "bottom" (see fund (n.)). In any general use it probably is extended from specific senses in anatomy.

The top part of the uterus.

Interior posterior surface of the eyeball; includes retina, optic disc, macula, posterior pole. Can be seen with an ophthalmoscope.

(n) (anatomy) the base of a hollow organ or that part of the organ farthest from its opening

The interior lining of the eyeball, including the retina, optic disc, and macula. This portion of the inner eye can be seen during an eye examination by looking through the pupil.

N M farm; piece of land| estate; bottom| lowest part; foundation; an authority

The superior portion of the body of the Stomach above the level of the cardiac notch.

The larger part of a hollow organ that is farthest away from the organ's opening. The bladder, gallbladder, stomach, uterus, eye, and cavity of the middle ear all have a fundus.

The base or the deepest part of an organ; the part farthest from the mouth of an organ, as the fundus of the uterus.