30 terms

Sensory system


Terms in this set (...)

optic disk
the point where the optic nerve enters the retina, The blind spot
whitish fibrous membrane (albuginea) that with the cornea forms the outer covering of the eyeball, The outermost layer of the eye
a transparent membrane covering the eyeball and under surface of the eyelid, The membrane that lines the eyelid
muscular diaphragm that controls the size of the pupil, The muscle that regulates the pupil
transparent anterior portion of the outer covering of the eye, The front of the eye
Aqueous humor
the limpid fluid within the eyeball between the cornea and the lens, The fluid that fills the space anterior to the lens
Fovea Centralis
area consisting of a small depression in the retina containing cones and where vision is most acute, The point of sharpest vision
Choroid coat
a highly vascular membrane in the eye between the retina and the sclera, The middle pigment layer of the eye
The small bones of the middle ear
crystalline lens
biconvex transparent body situated behind the iris in the eye
Vitreous humor
the clear colorless transparent jelly that fills the posterior chamber of the eyeball,
the faculty of smell,
producing a sensation of touch
Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness affects a significant percentage of the population. Red, Green, blue
General senses
touch, temperature, Pain
Special senses
smell, taste, hearing,
Difference between general senses and special senses?
General senses are spread throughout the body. Special Senses are localized by their respective sensory organ.
Eustachian tube
The Eustachian tube extends from the anterior wall of the middle ear to the lateral wall of the nasopharynx, approximately at the level of the inferior nasal concha. A portion of the tube (~1/3) proximal to the middle ear is made of bone; the rest is composed of cartilage[3] and raises a tubal elevation, the torus tubarius, in the nasopharynx where it opens.
what lobe of the brain receives visual impules
The Cerebral Lobes
Auditory Impules
The primary brain vesicles differentiate into secondary brain vesicles which further develop ... Auditory areas - temporal lobes contain primary auditory cortex (receives impulses from inner ear) and auditory association area (interprets sound).
Taste impulses
sensory areas - Specific areas of the cerebral cortex which receive and interpret somatic sensory impulses, e.g., olfaction in the frontal lobe, cutaneous sensations in the parietal lobe, visual sensations in the occipital lobe, taste, hearing, and equilibrium in the temporal lobe; visceral sensory impulses are received and interpreted in the diencephalon, cerebellum, and brain stem.
Name the ossicles in order
The ossicles (also called auditory ossicles) are the three smallest bones in the human body, the malleus, the incus, and the stapes. They are contained within the middle ear space and serve to transmit sounds from the air to the fluid-filled labyrinth (cochlea). The absence of the auditory ossicles would constitute a moderate-to-severe hearing loss. The term "ossicles" literally means "tiny bones" and commonly refers to the auditory ossicles, though the term may refer to any small bone throughout the body.
what type of muscles are found in the eye
The extraocular muscles are the six muscles that control movement of the eye (there are four in bovines) and one muscle that controls eyelid elevation (levator palpebrae). The actions of the six muscles responsible for eye movement depend on the position of the eye at the time of muscle contraction.
Four of the extraocular muscles control the movement of the eye in the four cardinal directions: up, down, left and right. The remaining two muscles control the adjustments involved in counteracting head movement; for instance this can be observed by looking into one's own eyes in a mirror while moving one's head.
What is the difference between extrinsic and intrinsic eye muscles?
The extrinsic muscles control the movement of the eyes.The extrinsic muscles are controlled by the somatic nervous system(voluntary)

The intrinsic muscles control the lens and pupil. The intrinsic eye muscles, (including the iris sphincter, radial pupilo dilator muscles and the ciliary muscle), are under the control of the autonomic nervous system(involuntary)
The purpose of papillary dilation and papillary constriction?
Pupillary response is a physiological response that varies the size of the pupil, either resulting in constriction (miosis)[1] or dilation , light
Name the photoreceptors of the eye and state their functions
Rod cells, or rods, are photoreceptor cells in the retina of the eye that can function in less intense light than the other type of visual photoreceptor, cone cells. Rods are concentrated at the outer edges of the retina and are used in peripheral vision.
Give the function of the structues that light passes through in the eye
Light from the world around you passes through the lens and is recorded on the retinas at the back of your eyes. The information from the retinas is then sent to your brain, which converts it into an awareness of objects around you.
the pathway of light from when it enters the eye
The visual pathway is the network of nerves that convey the light striking the eyes into the brain in the form of chemical and electrical information. The optic nerve carries signals indicating color, brightness, and motion from the retina to a relay center in the mid-brain called the thalamus. From here, neurons reach the visual cortex of the brain's occipital lobe, which assembles a neural map or chart of the visual fields of both eyes. The visual pathway's primary task of converting light information into a picture of the outside world is moderated by neurons of the visual cortex.
Accommodation of the eye
change in the thickness of the lens for near vision
The ossicle of the ear that is in contact with the tympanic membrane is the