感觉器官解剖生理 PPT课件.ppt

文档介绍：Part V The ans
Chapter one The an
consists of eyeball and ans of eye.
Section one the Eyeball
一、The structure of eyeball
The prises the wall of the eyeball and the contents enclosed by it.
(一) The Wall of Eyeball
It consists of three tunics(layers), from outside inwards, which are the fibrous tunic,the vascular tunic and retina.
1 The fibrous tunic(outer supporting layer)
consists of the sclera behind and the cornea in front.
1) The sclera
a. features: posterior five-sixths of the outer layer . strong , white and opaque
b. scleral venous sinus (Schlemm’ canal)
2) The cornea
a. features: anterior one-sixth of the outer layer. transparent and non-vascular, but rich nerve terminals
2. The vascular tunic
consists of the iris, the ciliary body and the choroid
1) The iris
a. location and shape
b. pupil
c. sphincter and dilator pupillae
d. iridocorneal angle
e. colour : brown , dark , blue .depends upon the number and placement of pigment cells (melanocytes)