Ch:26 Sense Organs Flashcards
How are these muscles involved with the tongue?
- Extrinsic muscle
- Intrinsic muscle
Extrinsic muscles move tongue in and out and side to side
Intrisnic muscles alter the shape of the tongue
What is another name for taste buds?
Papillae
Describe the following parts of the eyes:
- Sclera
- Cornea
- Iris
Sclera: white part of the eye
Cornea: allows light into the eye
Iris: colored portion of the eye
Describe the following parts of the eyes:
- Pupil
- Lens
- Retina
Pupil: center of iris; control the amount of light that enters
Lens: located behind the pupil; focus light onto the retina, the ciliary muscle changes the shape of the lens
Retina: contains photoreceptors (rods = for dim light at night) (cones = color during the day)
Cones are concentrated in a depression near the center of the retina called the __2 words__… this is the area of “Keenest Vision”.
“COMMON EXAM QUESTION”
Fovea centralis
fovea has no rods
What is the optic nerve also referred to as?
“the blind spot”
doesn’t contain any photoreceptors
Recall, that the lease of the eye changes shape. Lens becomes flattened for ______ vision, ciliary muscle relaxes. In __2 words__, lens becomes more spherical, ciliary muscle contracts.
distant; close up
ciliary muscle relaxes = flattened lense = distant vision
ciliary muscle contracts = spherical lens = close up vision
What is rhodopsin and what is it also referred to as?
Rhodopsin is a pigment found in rods and is also called “visual purple”.
Rhodopsin converts light into an electrical signal that allows us to see in dim light
What does the external ear consist of?
Pinna and auditory canal
What does the middle ear consist of?
Incus, malleus and stapes
What connects the middle ear to the nasopharynx and ensures that air pressure is equalized on either side of the eardrum?
Eustachian tube
The “pop” you hear when a plane is changing altitude; the eustachian tube enables you to equalize the pressure difference
What does the inner ear consist of?
semicircular canals, utricle, saccule and Choclea
Cochlea:
- this is a snail-like structure which contains a sensory receptor called the organ of Corti. This organ of Corti holds the hair cells, the nerve receptors for hearing… the mechanoreceptors of the ear!!!
Also in the inner ear are the semicircular canals, the utricle, and saccule. These structures are involved with _______.
“A COMMON EXAM QUESTION”
balance
“A COMMON EXAM QUESTION”
What structures in the inner ear are involved with balance?
“A COMMON EXAM QUESTION”
semicircular canals, utricle, and saccule
“A COMMON EXAM QUESTION”
