Optic Nerve - Physiology

Physiology

The eye's blind spot is a result of the absence of photoreceptors in the area of the retina where the optic nerve leaves the eye.

Each human optic nerve contains between 770,000 and 1.7 million nerve fibers, which are axons of the retinal ganglion cells of one retina. In the fovea, which has high acuity, these ganglion cells connect to as few as 5 photoreceptor cells; in other areas of retina, they connect to many thousand photoreceptors.

Read more about this topic:  Optic Nerve

Famous quotes containing the word physiology:

    Now the twitching stops. Now you are still. We are through with physiology and theology, physics begins.
    Alfred Döblin (1878–1957)

    A physician’s physiology has much the same relation to his power of healing as a cleric’s divinity has to his power of influencing conduct.
    Samuel Butler (1835–1902)

    I have more in common with a Mexican man than with a white woman.... This opinion ... chagrins women who sincerely believe our female physiology unequivocally binds all women throughout the world, despite the compounded social prejudices that daily affect us all in different ways. Although women everywhere experience life differently from men everywhere, white women are members of a race that has proclaimed itself globally superior for hundreds of years.
    Ana Castillo (b. 1953)