The fourth layer consists photoreceptor cells a Cone cells视锥细胞 are color receptors that function best during the day a rod cells视杆细胞 are dark-light receptors that function best at night and in dim light The third layer consists of bipolar neurons双极细胞 The second layer is formed ganglion cells节细胞, Whose axons form optic nerve The first layer consists of nerve axons that collect at the optic disk and pass through the sclera to form the optic nerve Ganglion cells Bipolar neurons Rod cells Cone cells Mrw'Pigment cell layer
◼ The fourth layer consists photoreceptor cells ❑ Cone cells 视锥细胞are color receptors that function best during the day ❑ Rod cells 视杆细胞are dark-light receptors that function best at night and in dim light ◼ The third layer consists of bipolar neurons 双极细胞 ◼ The second layer is formed ganglion cells 节细胞, whose axons form optic nerve ◼ The first layer consists of nerve axons that collect at the optic disk and pass through the sclera to form the optic nerve Pigment cell layer Cone cells Rod cells Bipolar neurons Ganglion cells
Optic disc视神经盘(bind spot), located medial to posterior pole of eye, and consists of optic nerve fibers and central artery of retina Macula|utea黄斑 a Lies lateral about 3.5 mm to optic disc, a shallow depression, it is completely free of blood vessels and is yellowish in color 口 Fovea centralis中央凹,aera of greatest visual acuity (concentration of cones), at its center The pigmented layer absorbs light that passes completely through the anterior layer preventing backscatter (blurring of vision)
◼ Optic disc 视神经盘 (blind spot), located medial to posterior pole of eye, and consists of optic nerve fibers and central artery of retina ◼ Macula lutea 黄斑 ❑ Lies lateral about 3.5 mm to optic disc, a shallow depression, it is completely free of blood vessels and is yellowish in color ❑ Fovea centralis 中央凹, aera of greatest visual acuity (concentration of cones), at its center ◼ The pigmentted layer absorbs light that passes completely through the anterior layer, preventing backscatter (blurring of vision)
Contents of eyeball Aqueous humor房水 Lens晶状体 Vitreous body玻璃体
Contents of eyeball Aqueous humor 房水 Lens 晶状体 Vitreous body 玻璃体
Aqueous humor房水 Chamber of eye眼房-lies between cornea and lens and divided by iris into anterior and posterior chambers Aqueous humor房水 A clear watery fluid that fills chamber of eye Continuously secreted by ciliary body into posterior chamber Passes through pupil into anterior chamber Then it filters though iridocorneal angle into sinus venosus sclerae. this sinus drains via anterior ciliary veins into ophthalmic veins
Aqueous humor 房水 Chamber of eye 眼房－ lies between cornea and lens, and divided by iris into anterior and posterior chambers Aqueous humor 房水 ◼ A clear watery fluid that fills chamber of eye ◼ Continuously secreted by ciliary body into posterior chamber ◼ Passes through pupil into anterior chamber ◼ Then it filters though iridocorneal angle into sinus venosus sclerae, this sinus drains via anterior ciliary veins into ophthalmic veins
Production and circulation of aqueous humor Ciliary body Posterior chamber up Anterior chamber iridocorneal angle Sinus venosus sclera -+ Anterior ciliary vein Ophthalmic vein Functions Helps focus light Helps maintain constant pressure in eyeball Helps nourish the lens and cornea
Ciliary body Posterior chamber Anterior chamber Sinus venosus sclera Anterior ciliary vein Ophthalmic vein Iridocorneal angle Pupil Production and circulation of aqueous humor Functions • Helps focus light • Helps maintain constant pressure in eyeball • Helps nourish the lens and cornea