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23 Cards in this Set
- Front
- Back
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Name the 3 general tunics (layers) of the eye |
Fibrous Vascular Retina |
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Name and describe the 2 components of the fibrous tunic. |
Sclera- White of eye (protection and shape) posterior Cornea - Transparent anterior Retracts light |
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Name and describe the general function of the six extraocular eye muscles. |
Superior rectus - pull up Inferior rectus- pull down Medial rectus - pull in Lateral rectus- pull out Superior oblique and Inferior oblique-rotate |
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Name the 3 components of the vascular tunic. |
Choroid Cilliary body Iris |
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Describe the choroid. |
Blood vessel layer |
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Describe the structure of the Cilliary body. |
consist of Cilliary muscle (acts like sphincter) connected to lens by suspensory ligaments Controls shape of lens |
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What are the 2 muscle groups of the iris |
Sphicter- parasympathetic Dilator- sympathetic |
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What is the function of the iris |
Color of the eye 2 groups of smooth muscle Controls the amount of light entering eye through pupil |
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Describe the retina. |
Receives light rays Houses photo receptor cells and their neurons |
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Describe the optic disk. |
Attaches retina to optic nerve (Blind spot) |
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Describe the macula luteal |
Sharpest vision area of cones called fovea centralis |
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What does fovea centralis mean? |
Central pit |
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What Is the function and composition of the eyelid |
Orbicularis Oculi- protect anterior eye Distributes lacrimal fluid during blinking |
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What is the path a tear takes from the lacrimal gland to the nasal cavity? |
Nasolacrimal Canal |
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Name the 3 regions of the ear. |
Outer Middle Inner |
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Describe the 3 components of the external ear. |
Auricle - directs sound waves External acoustic meatus- canal with skin Tympanic Membrane- vibrates & transmits sound wave energy to 3 bones of middle ear |
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Beginning at the tympanic membrane, list the structures, in order, that transmit sound waves to the oval window. |
Malleus Incus Stapes |
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Name and describe the general function of the 2 muscles located in the middle ear. |
Tensor Tympani and Stapedius pull auditory ossicles away from each other |
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Tell the function of the pharyngotympanic (eustachian) tube. |
Equalize air pressure into the inner ear |
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Name and describe the functions of the 3 structures of the inner ear. |
Cochlea-hearing Vestibule - linear movements (you moving) Semicircular Canals- rotation |
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Which branch of the vestibule clear nerve receives signals from the organ of Corti? |
Cochlea |
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Which branch of the vestibulocochlear nerve receives signals from the vestibule and semicircular canals? |
Vestibular branch |
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Cochlea + Vestibular branch = (Cranial nerve #) |
Vestibular cochlea |
