Материал: Атлас Ханц фениш

358

Sense organs

1

Iris. Frontally-located, round, variably colored

16

Lesser arterial circle of iris. Circulus arteriosus

1

disk about 10−12 mm in diameter, with a cen-

iridis minor. Ringlike vascular system in the vi-

tral aperture (pupil). The iris forms the poste-

cinity of the pupillary margin formed by anas-

2

rior border of the anterior chamber of the eye.

tomoses between the radial branches of the

Its lateral margins become continuous with the

greater arterial circle. A

ciliary body. A

17

Pupillary membrane. [Membrana pupillaris].

3

2

Pupillary margin. Margo pupillaris. Medial (in-

Anterior part of embryonical vascular mem-

ternal) margin of the iris bordering the pupil. A

brane around the lens that is situated behind

4

B

the pupil. It is fused to the pupillary margin and

3

Ciliary margin. Margo ciliaris. Lateral (external)

18

receives blood vessels from there.

margin of iris attached to ciliary body at the ir-

INTERNAL (SENSORY) TUNIC OF EYEBALL.

5

idocorneal angle. B

Tunica interna bulbi. It comprises the retina

4

Anterior surface. Facies anterior. It faces the

with its pigment epithelium.

6

anterior chamber. B

19

Retina. Inner lining of eyeball developed from

5

Posterior surface. Facies posterior. Surface

the two layers of the optic cup. Most of it is

7

facing the posterior chamber. A B

light-sensitive (pars optica). B

20 Pars optica retinae. Retinal segment capable of

6

Greater ring (circle) of iris. Anulus iridis major.

Ciliary segment of the iris, and outer cirucular

transforming light stimuli into nerve impulses.

8

It lines the posterior aspect of the eyeball and

zone on the anterior surface of the iris. It is

coarser and broader than the lesser ring. A

extends as far anteriorly as the ora serrata. B

9

7

Lesser ring (circle) of iris. Anulus iridis minor.

21

Pigmented part. Pars pigmentosa. Pigment

epithelium arising from the external layer of the

Pupillary segment of iris. Narrow, circular inner

zone on the anterior surface of iris. Its structure

optic cup. B

10

22

Nervous part. Pars nervosa. Retina proper con-

is finer than that of the greater ring. A

8

Iridial folds. Plicae iridis. Folds passing around

sisting essentially of three nuclear layers lying

11

the pupillary margin on the anterior side of the

internal to the pigment epithelium. B

23

Neuroepithelial (photosensitive) layer. Stratum

iris. They make the pupillary margin appear

slightly serrated. A

neuroepitheliale (photosensorium). Outer layer

12

9

Pupil. Pupilla. Aperture in the iris surrounded

of the cerebral stratum. It consists of rods and

by the pupillary margin of the iris. Its diameter

cones, the outer segments of which affect the

13

varies depending upon the intensity of light and

transformation of light stimuli into nerve im-

pulses. Cell bodies of rods and cones form the

the focal distance of the observed object. A

10

M. sphincter pupillae. Network of spirally

outermost layer of the retinal nuclei (external

14

nuclear layer). D

coursing muscle fibers the longitudinal axes of

24

Internal nuclear layer. [[Stratum ganglionare reti-

which run approximately parallel to the pupil-

15

lary margin when the pupil is dilated. It is in-

nae]]. Middle layer of cell nuclei mainly con-

sisting of the cell bodies of bipolar and amacrine

nervated by parasympathetic fibers from the

oculomotor nerve. B

cells. D

16

25

Ganglion cell layer. [[Stratum ganglionare n. op-

11

M. dilator pupillae. Thin layer of smooth

muscle mainly comprised of radially oriented

tici]]. Internal layer of nuclei consisting of multi-

17

fibers. It is innervated by sympathetic fibers

polar cell bodies of initially non-myelinated

ganglion cells the axons of which form the optic

from the carotid plexus.

12

Stroma iridis. Vascular framework of the iris in-

nerve. D

18

26

Ora serrata. Serrated margin between the

filtrated by pigmented connective tissue cells.

Its anterior and posterior portions are thicker

light-sensitive and light-insensitive parts of the

19

than the rest and are divided by a fine fibrous

neural retina. B C

27

Pars ciliaris retinae. Light-insensitive retinal

network. A B

13

Pigmented (posterior) epithelium. Epithelium

segment consisting of a bilayered cuboidal

20

epithelium (ciliary epithelium) forming the

pigmentosum. Bilayered epithelium on the

posterior surface of the iris. It is so heavily pig-

posterior surface of the ciliary body. Its outer

21

mented that no nuclei are visible on the surface

layer of epithelium is continuous with the pig-

ment epithelium of the retina and is pigmented,

facing the posterior chamber. A

14

Spaces of iridocorneal angle [spaces of Fon-

whereas the innermost epithelium is continu-

22

ous with the pars nervosa of the retina and is

tana]. Spatia anguli iridocornealis. Interstices

devoid of pigment. B

between the fibers of the trabecular meshwork.

28 Pars iridica retinae. Light-insensitive retinal

23

They form passageways that convey aqueous

segment on the posterior surface of the iris. It is

fluid to the sinus venosus sclerae. A

15

Greater arterial circle of iris. Circulus arterio-

continuous with the pars ciliaris retinae and

24

forms the bilayered posterior epithelium of the

sus iridis major. Ringlike vascular system with

iris. Both layers are heavily pigmented. B

radiating branches. It is formed by anastomoses

360

Sense organs

1

Optic disc (papilla). Discus nervi optici [papilla

16

1

nervi optici]. Beginning of the optic nerve as

visualized in the fundus about 3−4 mm medial

2

to the macula. It is about 1.6 mm in diameter. C

2 Physiological cup. Excavatio disci. Depression

17

3

in the middle of the optic disc with the stems of

the central retinal artery and vein. C

3 Macula [[lutea]]. Transversely oval, yellowish

4

area, 2−4 mm in diameter, at the posterior pole

of the retina. C