Page 927 - Atlas of Histology with Functional Correlations
P. 927
FIGURE 22.11 | Optic Papilla (Optic Disk), Optic
Nerve, and Section of Retina in Posterior Region
of Eyeball
In the posterior region of the eyeball is where retinal axons (5) from the
ganglion cells of the retina converge to form an optic nerve that penetrates the
connective tissue sclera (3) and leaves the eyeball. Where the optic nerve leaves
the eyeball is the optic disk (optic papilla), which is completely insensitive to
light because of the absences of the photoreceptor cells and is, therefore, the
blind spot in the eye. After leaving the eyeball, the optic nerve in the eye orbit of
the skull is surrounded by the meninges of the brain, the pia mater (7), a
subarachnoid space (6), and a thick dura mater (8). This low-magnification
micrograph also shows different dark-staining cellular and light-staining layers
of the retina (1) and the adjacent, dense-staining choroid (2). Surrounding the
exterior of the eyeball are the cells of the adipose tissue (4).
FIGURE 22.11 ■ Optic papilla (optic disk), optic nerve, and a section of retina
in the posterior region of the eyeball. Stain: hematoxylin and eosin. ×10.5.
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