11.1 Eye Flashcards
What are the body’s general senses?
somatic senses (touch, pressure, pain, temp, proprioception) Visceral sense (vision, hearing, equilibrium, taste, smell)
What is the function of adipose tissue around the eye?
padding, insulation, protection
what is the white part of the eye?
sclera
what does the sclera consist of?
dense fibrous connective tissue forming a tough external coat
what is the function of the sclera
protects and shapes the eyeball
provides sturdy anchoring site for the extrinsic eye muscles
what is the transparent anterior portion of the sclera?
the cornea
what is the function of the cornea
allows light to enter the eye and it helps bend light rays so they are focused on the photoreceptors in the retina
how man extrinsic eye muscles are there?
6
what type of muscle are the extrinsic eye muscles
skeletal muscles
what is the function of the extrinisc eye muscles
provides rotary movements of the eye
focus for the eye for optimum vision
anchor the eye in the bony orbit
what fluid is found in the anterior poriton of the eye
aqueous humour
what is the function of aqueous humour
supplies nutrients and oxygen to the lens and cornea while carrying away wastes
what are the 3 layers of tunics that make up the eye wall
outermost - sclera, cornea
middle - iris, ciliary body, choroid
inner??
where is the iris?
it is the circular coloured portion of the eye that lies anterior to the lens
what does the iris consist of?
two layers of muscle
inner circular and outer radial smooth muscles
where are the iris muscles arranged?
around the pupil
what happens when the circular muscles of the iris contract? when does this occur?
pupil becomes more constricted and less light enters the eye
close vision, bright light.
what happens when the radial smooth muscles contracts? When does this occur
pupil dilates allowing for more light to enter the eye
far vision, dim light
what fluid is found in the posterior poriton of the eye
vitreous humour
what is the function of vitreous humour
transmits light
supports posterior surface of the lens
holds retina firmly against pigmented layer
contributes to intraoccular pressure
what holds the lens in place?
suspensory ligaments
what are suspensory ligaments attached to?
the lens and ciliary body
other than the suspensory ligaments what are the ciliary bodies attached to?
the iris posteriorly
what is the ciliary body made up of
ciliary processes and ciliary muscles
