Special Senses - Chapter 15 - Workbook - Exercise 24.3 - A. Structure of the Eye and Vision - 2. Structure of the Eyeball

iris

The ___ is the most anterior portion of the vascular tunic and contains pigmented cells. It is made of circular smooth muscle and controls the pupil size.

retina

The ______ (sensory tunic) is the inner coat that begins at the ora serrata, the serrated boundary between the ciliary muscle and the ______. The ______ continues posteriorly, lining the interior of the choroid.

ciliary muscle

The ______ is a circular smooth muscle that contracts to control the shape of the lens.

pupil

The ______ is the opening in the middle of the iris that allows light to enter the eyeball and changes size in response to the intensity of light.

choroid

The _______ is the most posterior part of the vascular tunic that lines most of the interior of the sclera. It contains many blood vessels that nourish the retina.

cornea

The _______ is the transparent anterior portion that covers the iris and pupil.

sclera

The ________ (scler- = hard) is the tough, white part of the eye that forms the majority of the eyeball.

ciliary body

The _________ begins posterior to the iris at the junction of the cornea and sclera and consists of the ciliary muscle and ciliary processes.

fibrous tunic

The ___________ is composed of the cornea and sclera.

pigmented layer

The ___________ of the retina is the outer portion, and the neural layer is the inner portion that contains photoreceptors and associated neurons.

scleral venous sinus

The ________________ (canal of Schlemm) is an opening found at the junction of the cornea and the sclera.

middle vascular tunic

The __________________ is composed of the iris, ciliary body, and choroid.

ciliary processes

______________ are folds that protrude from the ciliary body toward the lens. They contain capillaries that secrete aqueous humor, the fluid in the anterior chamber of the eyeball.

suspensory ligaments (zonular fibers)

____________________________ are thin fibers that attach the lens to these processes.

outer fibrous tunic

The wall of the eyeball has 3 layers: 1. _______________ 2. middle vascular tunic 3. inner retina

middle vascular tunic

The wall of the eyeball has 3 layers: 1. outer fibrous tunic 2. __________________ 3. inner retina

inner retina

The wall of the eyeball has 3 layers: 1. outer fibrous tunic 2. middle vascular tunic 3. _________

neural layer

The pigmented layer of the retina is the outer portion, and the ________ is the inner portion that contains photoreceptors and associated neurons.