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The general arrangement of the brain and attached nerves and blood vessels. At <em>a b</em> and <em>c</em> is the cerebrum; at <em>f</em> is represented the corpus callosum that joins the two hemispheres together; at d is the cerebellum; at <em>g</em> is the beginning of the optic nerves and at <em>l</em> is the olfactory nerve.

The Brain

The general arrangement of the brain and attached nerves and blood vessels. At a b and c…

Diagram of the cranial nerves, 1-4 (Olfactory, Optic, Motor Oculi, and Trochlear).

The Cranial Nerves

Diagram of the cranial nerves, 1-4 (Olfactory, Optic, Motor Oculi, and Trochlear).

The eye and its muscles. Labels: o, the nerve of sight; a, one of the muscles of the eye.

The Eye and its Muscles

The eye and its muscles. Labels: o, the nerve of sight; a, one of the muscles of the eye.

A, section through the compound eye of a crayfish. Labels: 1, cornea; 2, crystaline cones; 3, retinulae; 4, pigment cells; 5, cuticle; 6, epithelium; n, optic nerve; g, ganglia. B, A single element (ommatidium) from the compound eye of a crayfish. Labels: 1, corneal lens; 2, corneal cells; 3, crystalline cone cells; 4, 5, outer and inner parts of the crystalline cone; p, pigment cells; r, retinula; R, rhabdome; b, basement membrane.

Eye of a Crayfish

A, section through the compound eye of a crayfish. Labels: 1, cornea; 2, crystaline cones; 3, retinulae;…

The eye. Labels: a, sclerotica; e, cornea; b, choroid; d, optic nerve; f, aqueous humor; g g , iris; h, lens; i, vitreous humor; c, retina.

The Eye

The eye. Labels: a, sclerotica; e, cornea; b, choroid; d, optic nerve; f, aqueous humor; g g , iris;…

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic and cornea; 3, cornea; 4, 5, conjunctival membrane; 7, ciliary muscle; 10, choroid; 11, 13, ciliary processes; 14, iris; 15, retina; 16, optic nerve; 17, artery entering retina; 18, fovea centralis; 19, region where sensory part of retina ends; 26, 27, 28, are placed on the lens; 28 , suspensory ligament placed around lens; 29, vitreous humor; 30, aqueous humor in anterior chamber.

Left Eyeball in Horizontal Section

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic…

Horizontal section of the eyeball, showing the suspensory ligament of the lens, the aqueous and vitreous chambers, entrance of the optic nerve, and the fovea centralis.

Eyeball

Horizontal section of the eyeball, showing the suspensory ligament of the lens, the aqueous and vitreous…

Diagram of a horizontal section through left eyeball and optic nerve.

Eyeball and Optic Nerve

Diagram of a horizontal section through left eyeball and optic nerve.

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic and cornea; 3, cornea; 4, 5, conjunctiva; 7, ciliary muscle; 10, choroid; 11, 13, ciliary processes; 14, iris; 15, retina; 16, optic nerve; 17, artery entering retina in optic nerve; 18, fovea centralis; 19, 20, region where sensory part of retina ends; 22, suspensory ligament; 24, the anterior part of the hyaloid membrane; 26, the lends; 29, vitreous humor; 30, aqueous humor.

The Eyeball in Horizontal Section

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic…

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic and cornea; 3, cornea; 4,5, conjunctiva; 6, posterior elastic layer of cornea; 7, ciliary muscle; 10, choroid; 11,13, ciliary processes; 14, iris; 15, retina; 16, optic nerve; 17, artery entering retina in optic nerve; 18, fovea centralis; 19, region where sensory part of retina ends; 22, suspensory ligament; 23 is placed in the canal of Petit, and the line from 25 points to it; 24, the anterior part of the hyaloid membrane; 26, 27, 28, are placed on the lends; 28 points to the line of attachment around it of the suspensory ligament; 29, vitreous humor; 30, anterior chamber of aqueous humor; 31, posterior chamber of aqueous humor.

Section of Left Eyeball

The left eyeball in horizontal section from before back. Labels: 1, sclerotic; 2, junction of sclerotic…

The eyeballs and their muscles as seen when the roof of the orbit has been moved and the fat in the cavity has been partly cleared away. On the right side the superior rectus muscle has been cut away. Labels: a, external rectus; s, superior rectus; i, internal rectus; t, superior oblique.

The Eyeballs and Their Muscles

The eyeballs and their muscles as seen when the roof of the orbit has been moved and the fat in the…

The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section.

Optic Nerve

The terminal portion of the optic nerve and its entrance into the eyeball, in horizontal section.

Diagram of the central connection of the optic nerve and optic tract.

Optic Nerve

Diagram of the central connection of the optic nerve and optic tract.

Diagram of the central connections of the optic nerve and optic tract.

Optic Nerve and Optic Tract

Diagram of the central connections of the optic nerve and optic tract.

Diagram of the roots of the optic nerve.

Roots of the Optic Nerve

Diagram of the roots of the optic nerve.

Diagram of the structure of the human retina. Labels: I, pigment layer; II, rod and cone layer; R, rods; C, cones; III-IX, intraretinal nerve-elements; X, axons which pass to optic nerve.

Retinal Structure

Diagram of the structure of the human retina. Labels: I, pigment layer; II, rod and cone layer; R, rods;…