ANATOMY - SPECIAL SENSES
What are the five senses ✔✔Taste, smell, equilibrium, sight and hearing (touch is now considered a
general sense, not a special one)
Where is the sense of equilibrium housed? ✔✔the ear
what percent of sensory receptors are found in they eye ✔✔70%
How much of the surface of the eye can be seen? ✔✔One sixth (called the palpebral fissure - the bit
between your eyelids)
What are the edgepoints of the eyelids called ✔✔The commissures (medial and lateral)
What are the glands at the eyelid edge and what do they secrete ✔✔The glands are tarsal glands, and
they produce an oily secretion that lubricates the eye
Where is the lacrimal gland ✔✔Outer edge of top of eyelid between eyebrow and lid.
What is the name of the mucouse membrane of the eye ✔✔Conjunctiva - only covers the white of the
eye and contains the vessels that make your eye bloodshot (it stops at the cornea)
What are the components of the lacrimal apparatus ✔✔The lacrimal gland (produces tears) and the
lacrimal ducts (drain the tears onto the conjunctiva
Where do tears start from and go to ✔✔They are produced in the lacrimal gland and released onto the
conjunctiva by lacrimal ducts. They are then flushed across the eyeball and empty into the lacrimal
canalliculi and down into the lacrimal sac, which empties into the nasal cavity.
What makes up tears ✔✔dilute salt solution, also containing lysozyme, an enzyme that destroys
bacteria.
Why do your eyes get watery when you have allergies or a cold? ✔✔Your sinuses will be blocked,
which means that tears cannot drain into them. This causes the tears to back up and make your eyes
watery, or even teary.
What are the three layers of the eye wall called? ✔✔Fibrous (the white, called the sclera and the
cornea), the vascular (containing the choroid, ciliary body and iris) and retina (containing the pigmented
and sensory layer)
What is the pupil ✔✔It's a hole in the iris
