16 Receptors and sensory organs

Anterior segment of eye

Cornea

Anterior chamber

Pupil

IrisPosterior chamber Ciliary process Lens

Vitreous body

Anterior chamber Posterior corneal epithelium (simple squamous epithelium)

Posterior limiting lamina (Descemet's membrane)

Collagenous corneal stroma

Subepithelial basement membrane

Anterior corneal epithelium

Anterior chamber

Posterior corneal epithelium (simple squamous epithelium)

Posterior limiting lamina (Descemet's membrane)

Anterior segment of eye. H.E. stain; x10.

Cornea, cat.

H.E. stain; x100.

Collagenous corneal stroma

Cornea, cat. H.E stain; x200.

16 Receptors and sensory organs

Anterior segment of eye

Lens capsule (formed from secretion of lens epithelium)

Lens epithelium (simple cuboidal)

Lens fibres

Lens fibres (structural foundation of lens) consisting of concentric layers of cytoplasm of lens epithelium (longitudinal section)

Posterior chamber

Lens capsule

Lens epithelium

Zonular fibres

Lens, cat. H.E. stain; x200.

Lens fibres, cat. H.E. stain; x200.

Ciliary process

Zonular fibres, cat. H.E. stain; x100.

16 Receptors and sensory organs

Anterior segment

Ciliary processes

Dense capillar y network, elastic fibres

Zonular fibres

Simple cuboidal to columnar epithelium (inner layer of pars caeca retinae)

Simple cuboidal to columnar epithelium (outer layer of pars caeca retinae, pigment epithelium)

Loose connective tissue with capillaries, elastic fibres and pigmented cells

Zonular fibres

Simple cuboidal to columnar epithelium (inner layer of pars caeca retinae)

Simple cuboidal to columnar epithelium (outer layer of pars caeca retinae, pigment epithelium)

Epithelium (flat section)

Loose connective tissue with capillaries, elastic fibres and pigmented cells

Bilayered pigmented epithelium

Ciliary processes, cat. H.E. stain; x100.

Ciliary processes, cat. H.E. stain; x400.

Ciliary processes, pig. Azan stain; x400.

16 Receptors and sensory organs

Anterior segment

Anterior chamber

Simple epithelium

Iris

Pigmented epithelium on posterior surface of iris

Iridocorneal angle

Posterior corneal epithelium (simple squamous epithelium)

Iris with partial sections of pigment epithelium

Iridocorneal angle with pectinate ligament

Ciliary body

Posterior chamber

Cornea

Attachment site of pectinate ligament on posterior surface of cornea Trabecular meshwork Pectinate ligament

Ciliary processes

Iridocorneal angle, pig. Azan stain; x100.

Ciliary processes

Iridocorneal angle, ox. H.E. stain; x40.

Ciliary processes

Iridocorneal angle, horse. H.E. stain; x40.

16 Receptors and sensory organs

Anterior segment

Posterior corneal epithelium (simple squamous epithelium)

Collagenous corneal stroma

Subepithelial basement membrane

Anterior corneal epithelium

Posterior corneal epithelium (simple squamous epithelium)

Posterior limiting lamina (Descemet's membrane) Collagenous corneal stroma

Anterior corneal epithelium

Posterior corneal epithelium (simple squamous epithelium)

Posterior limiting lamina (Descemet's membrane)

Cornea, calf. H.E. stain; x200.

Cornea, horse. H.E. stain; x100.

Collagenous corneal stroma

Cornea, horse. H .E. stain; x200.

16 Receptors and sensory organs

Anterior segment of eye

Simple columnar epithelium(pars iridica retinae) containing pigment Simple pigment epithelium

Myoepithelial cells (m. dilatator pupillae)

Pigment cell

Iris stroma with collagen fibre bundles, vessels and autonomic nerves Discontinuous epithelium with

Iridic granules with cavities

Iris stroma with collagen fibre bundles, vessels and autonomic nerves

Muscle fibres (m. sphincter pupillae)

Iridic granules formed from cells of pigment epithelium Dense capillary network

crypts

Iris, horse H.E. stain; x100.

Iris and iridic granules, horse. H.E. stain; x40.

Cavities in iris stroma

Iridic granules, horse. H.E. stain; x400.