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The choroid, ciliary body, and iris of the eyeball.

The Choroid, Ciliary Body, and Iris

The choroid, ciliary body, and iris of the eyeball.

A section of the human eye.

Eye

A section of the human eye.

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil we have the crystalline lens, f, and then the vitreous humor, h, filling all the interior of the ball of the eye. m indicates the retina, which is an expansion of the optic nerve, n. k is the choroid coat, a membrane interposed between the retina and the sclerotic coat; it terminates in form in a series of folds or filaments, g, called the ciliary ligament or process." —Wells, 1857

Eye

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil…

"Diagram of the eye. C., Cornea; a.h., aqueous humour; c.b., ciliary body; l., lens; I., iris; Sc., sclerotic; Ch., choroid; R., retina; v.h., vitreous humour; y.sp., yellow spot; n., optic nerve." -Thomson, 1916

Eye

"Diagram of the eye. C., Cornea; a.h., aqueous humour; c.b., ciliary body; l., lens; I., iris; Sc.,…

Ciliary processes, as seen from behind. Labels: 1, posterior surface of the iris, with the sphincter muscle of the pupil; 2, anterior part of the choroid coat; 3, one of the ciliary processes of which about seventy are represented.

Ciliary Processes of the Eye as Seen from Behind

Ciliary processes, as seen from behind. Labels: 1, posterior surface of the iris, with the sphincter…

Plan of the eye seen in section. Labels: A, The Sclerotic Coat; B, The Choroid Coat; C, The Retina; D, The Optic Nerve; E, The Cornea; F, The Aqueous Humor; G, The Iris; H, The Ciliary Processes; I. The Crystalline Lens; K, The Vitreous Humor.

Diagram of the Eye

Plan of the eye seen in section. Labels: A, The Sclerotic Coat; B, The Choroid Coat; C, The Retina;…

"Diagram illustrating the Manner in which the Image of an Object is inverted on the Retina." — Blaisedell, 1904

Diagram of the Eye

"Diagram illustrating the Manner in which the Image of an Object is inverted on the Retina." — Blaisedell,…

"Section of the human eye." — Blaisedell, 1904

Human eye

"Section of the human eye." — Blaisedell, 1904

Section of the eye, showing the relations of the cornea, sclera, and iris, together with the Ciliary muscle and the cavernous spaces near the angle of the anterior chamber.

Section of the Eye

Section of the eye, showing the relations of the cornea, sclera, and iris, together with the Ciliary…

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 middle or vascular coat of the eyeball exposed from without. Left eye, seen obliquely from above and before.

Vascular Coat of the Eye

The middle or vascular coat of the eyeball exposed from without. Left eye, seen obliquely from above…

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…

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; 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…

Section through ciliary region of eyeball.

Section Through Eyeball

Section through ciliary region of eyeball.

The rhizomes of german iris are formed on top of the ground. The rhizomes should not be covered with soil because they will rot in the winter.

Surface Rhizomes of German Iris

The rhizomes of german iris are formed on top of the ground. The rhizomes should not be covered with…

The Iris is found throughout the world.

Iris

The Iris is found throughout the world.

"Iris carrying Child" — Gayley, 1893

Iris

"Iris carrying Child" — Gayley, 1893

"Iris puts on her robe of many colors, and tingeing the sky with her bow, seeks the palace of the King fo Sleep." —Bulfinch, 1897

Iris

"Iris puts on her robe of many colors, and tingeing the sky with her bow, seeks the palace of the King…

"Diagram of the trimerous symmetrical flower of Iris. There are three alternating divisions of each whorl. Below is a single bracket." — Encyclopedia Britanica, 1893

Iris

"Diagram of the trimerous symmetrical flower of Iris. There are three alternating divisions of each…

Iris is a genus of between 200-300 species of flowering plants with showy flowers. It takes its name from the Greek word for a rainbow, referring to the wide variety of flower colors found among the many species. As well as being the scientific name, iris is also very widely used as a common name; for one thing, it refers to all Iris species, but some plants called thus belong to closely related genera. In North America, a common name for irises is flags, while the subgenus Scorpiris is widely known as junos, particularly in horticulture.

Iris

Iris is a genus of between 200-300 species of flowering plants with showy flowers. It takes its name…

An illustration of the iris flower.

Iris

An illustration of the iris flower.

Each spathe of iris caucasica has one flower. The flowers are a pale yellow and have no scent. Each stem has one to three flowers.

Iris Caucasica

Each spathe of iris caucasica has one flower. The flowers are a pale yellow and have no scent. Each…

Iris germanica is commonly know as either German or common iris. The flowers are purple with a white claw with brownish veins. The flowers are very fragrant. Each clusters has four to five flowers.

Habit and Detached Flower of Iris Germanica

Iris germanica is commonly know as either German or common iris. The flowers are purple with a white…

Iris guldenstadtiana flowers bloom in June. Each spathe has two or three flowers. The plant grows two feet tall.

Iris Guldenstadtiana

Iris guldenstadtiana flowers bloom in June. Each spathe has two or three flowers. The plant grows two…

Iris histrio flowers are a lilac purple color. Each spathe has one flower.

Flowers and Leaves of Iris Histrio

Iris histrio flowers are a lilac purple color. Each spathe has one flower.

Iris iberica flowers grow alone on each stem. The flowers are white or pale lilac.

Flower of Iris Iberica

Iris iberica flowers grow alone on each stem. The flowers are white or pale lilac.

The common name of iris laevigata is Japanese Iris. The flowers are bright purple and grow alone on each stem. The leaves are pale green, thin, and weak.

Iris Laevigata Flore-Pleno

The common name of iris laevigata is Japanese Iris. The flowers are bright purple and grow alone on…

Iris pallida is a fragrant flower with a smell similar to orange blossoms. The lower half of the flower is veined with bright lilac on a white ground.

Flower Scape of Iris Pallida

Iris pallida is a fragrant flower with a smell similar to orange blossoms. The lower half of the flower…

Iris persica flowers are violet scented. The flowers bloom in February and March. The flowers are a pale, yellowish lilac with a bright yellow, beardless keel.

Iris Persica

Iris persica flowers are violet scented. The flowers bloom in February and March. The flowers are a…

Iris pumila is a small, dwarf variety. The flowers are a bright, lilac purple color.

Iris Pumila

Iris pumila is a small, dwarf variety. The flowers are a bright, lilac purple color.

The limb of iris reticulata is a deep, violet purple. The flower also has a narrow, paler keel that is violet spotted with a narrow yellow line down the center.

Iris Reticulata

The limb of iris reticulata is a deep, violet purple. The flower also has a narrow, paler keel that…

Iris susiana flowers grow alone of each stem. The flowers are a whitish lilac with dense, fine brown black spots.

Iris Susiana

Iris susiana flowers grow alone of each stem. The flowers are a whitish lilac with dense, fine brown…

Iris versicolor flowers are redish purple. The flowers grow in clusters. This variety is common in North America.

Habit and Detached Portion of Inflorescence of Iris Versicolor

Iris versicolor flowers are redish purple. The flowers grow in clusters. This variety is common in North…

The stem of iris vulgare is one to two feet high with one or two flowers. The flowers are purple and erect.

Habit and Detached Flower of Iris Vulgare

The stem of iris vulgare is one to two feet high with one or two flowers. The flowers are purple and…

The iris, the ciliary muscle, and the coroidea membrane.

Iris, Ciliary Muscle and Coroidea Membrane

The iris, the ciliary muscle, and the coroidea membrane.

Iris, ciliary muscle, and choroid of the eye.

Iris, Ciliary Muscle, and Choroid

Iris, ciliary muscle, and choroid of the eye.

The capsule of iris bursts when ripe. When the capsule bursts it discharges its' contents.

Dehiscing Capsule of Iris

The capsule of iris bursts when ripe. When the capsule bursts it discharges its' contents.

Section of the iris. Anterior surface magnified.

Section of the Iris

Section of the iris. Anterior surface magnified.

On the left (a) the pupil is wide open (dilated), while on the right (b) the pupil is contracted. The iris regulates the opening and closing of the pupil and it has two sets of fibers, straight and circular. When the pupil is open the circular fibers of the iris are relaxed while the straight ones are open. When the pupil is contracted, the straight fibers of the iris are relaxed while the circular ones are contracted.

Pupil Contraction and Dilation

On the left (a) the pupil is wide open (dilated), while on the right (b) the pupil is contracted. The…

A species of flower, native to the temperate climate.

Yellow Iris

A species of flower, native to the temperate climate.