Sensory Organs - Eye Flashcards
Organs of sense are classified as a subsection of :
The nervous system.
The sensory organs receive and filters sensory input
that is interpreted in the central nervous system.
Organs of sense include
the eye and the ear.
The eye is the
sense organ of sight.
The eyeball is made up of three layers
The innermost later is the retina, the middle layer is the choroid, and the outermost layer is the sclera.
Sensory organs - eye
Sense organ of sight
Sensory organs - eye
Layers
Retina (nervous)
Choroid (vascular)
Sclera (fibrous)
The eyeball is separated into
an anterior segment filled with aqueous and a posterior segment filled with vitreous humor.
The crystalline lens separates the two segments.
The aqueous humor is responsible for the intraocular pressure in your eye. The vitreous humor shares in the responsibility for the intraocular pressure, but also prevents the eyeball from collapsing.
One of the most common procedures on the eye is actually on the muscles that control the eye movement instead of the eyeball itself.
That is, strabismus surgery which is performed by shortening or lengthening various muscles of the eye.
Two segments divided by Crystalline Lens
Anterior segment
- Filled with aqueous humor
- Responsible for intraocular pressure
Posterior segment
- Filled with vitreous humor
- Prevents the eyeball from collapsing
The ear plays a part in both
the sense of hearing and the sense of equilibrium.
The ear works in tandem with the auditory nerves to send auditory impulses to the temporal lobes of the cerebrum.
These structures, working together, form the auditory apparatus.
The ear has three distinct and separate anatomical divisions:
The outer, or external, ear, the middle ear or tympanic cavity, and the inner ear or labyrinth.
The auditory apparatus uses the ear to capture sound waves and transmits or conducts them into the tiny hair cells in the organ of Corti.
Dendrites (nerve endings) of the sensory neurons for hearing are found in the bottom of those tiny hair cells.
The auditory canal, or Eustachian tube, connects each middle ear to the throat.
This allows easy transfer of infections in the throat to move into the ear causing a middle ear infection. Children who have repetitive ear infections at an early age will sometimes have tubes placed in their ears.
Ontology is the study of the ear.
This is a very specialized field of medicine.
There are two types of services; audiometer and surgical.
Surgical services are often performed by an ENT physician and the codes for procedures are typically found in the Surgery Section of the COT code book.
Audiometry services are studied to test and improve your hearing.
The codes for three services are typically found in the Medicine section of the CPT code book.
Sensory organs - ear
Eustachian tube
Connects each middle ear to the throat.
Sensory organs - ear
Otology
Audiometry services
Surgical services
