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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 16 - Special Senses

Plate 16.305 Iris

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


Plate 16.305 Iris

Rhesus monkey, 10% formalin, H. & E., 612 x.


Pigmented epithelium: On the posterior surface of the iris. A layer of cuboidal cells whose outlines are masked by the heavy pigment.

Constrictor smooth muscle: The fibers are arranged circumferentially at the margin of the pupils. Contraction will constrict the pupil. Supplied by parasympathetic postganglionic neurons of the oculomotor nerve located in the ciliary ganglion.

Blood vessels: In the iris stroma. Have a thick adventitial layer forming a unique fibrous acellular wall.

Melanocytes: Spindle-shaped connective tissue cells, with long processes containing yellow-brown pigment, scattered in the loose stroma of the iris. Most commonly seen along the anterior border of the iris. The number of pigment cells varies with the individual's complexion.  

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