Chapter 8 - Special senses Flashcards
5th special sense
equiliibrium
4 traditional senses
smell taste sight and hearing
where are most of the sensory receptors?
eyes; 70 percent
diameter of an adult eye
1 inch
eyelids
protect the eyes anteriorly
eyelashes
project from the border of the eye lid
conjunctiva
lines the eyelid and covers part of outer surface of the eyeball. secretes mucus to keep eyeball moist
extrinsic eye muscles
6 muscles that are attached to the outer surface and produce gross eye movements
eyeball
hollow sphere that has 3 layers
fibrous layer
outermost layer of the eyeball; consists of protective sclera and transparent cornea
sclera
thick glistening white connective tissue
“white of the eye”
cornea
window through which light enters the eye
vascular layer
middle layer of the eyeball
choroid
blood nutritive tunic that contains a dark pigment
ciliary body
two smooth muscles which the choroid is modified to form
Pupillary Reflex
when the pupils constrict to see closer objects
aqueous humor
clear and watery fluid that fills space between the cornea and iris, watery liquid secreted at the ciliary body that fills the anterior and posterior chambers of the eye and provides nourishment for the cornea, iris, and lens
Auricle or Pinna
external ear
Basal cell
stem-cells replaces taste buds
tarsal glands
oil glands along the edge of the eyelid that lubricate the eyes