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Questions and Answers
What is the function of the ear pinna?
What is the function of the ear pinna?
What type of epithelium covers the tympanic membrane?
What type of epithelium covers the tympanic membrane?
What is the function of the ceruminous glands in the external auditory meatus?
What is the function of the ceruminous glands in the external auditory meatus?
What is the structure of the outer fibrous layer of the eye wall?
What is the structure of the outer fibrous layer of the eye wall?
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What is the function of the choroid?
What is the function of the choroid?
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What determines eye color?
What determines eye color?
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What is the structure of the epithelial cells in the ciliary body?
What is the structure of the epithelial cells in the ciliary body?
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What is the function of the external auditory meatus?
What is the function of the external auditory meatus?
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Study Notes
Ear
- The ear is divided into three parts: external ear, middle ear, and inner ear.
- The external ear consists of the ear pinna (formed of elastic cartilage covered by thin skin) and the external auditory meatus (a flattened canal lined with thin skin containing hair follicles, sebaceous glands, and ceruminous glands).
- The external auditory meatus directs sound waves to the tympanic membrane.
- The tympanic membrane (ear drum) is covered by simple cubical epithelium and transmits sound vibrations to the middle ear.
Middle Ear
- The middle ear cavity is lined with simple cubical cells.
Inner Ear
- The inner ear contains the Cochlea.
Eye
The Eye Wall
- The eye wall is composed of three layers: outer fibrous layer, middle vascular layer, and inner nervous layer.
Outer Fibrous Layer
- The outer fibrous layer is composed of the cornea (anterior, stratified squamous non-keratinized epithelium) and the sclera (posterior, formed of dense irregular connective tissue).
Middle Vascular Layer
- The middle vascular layer is composed of the iris, ciliary body, and choroid.
Inner Nervous Layer
- The inner nervous layer is composed of the retina.
Eye Color
- Eye color is determined by the amount of melanin in the iris pigmented epithelium on the back of the iris.
The Ciliary Body
- The ciliary body is composed of two layers: the inner layer (formed of non-pigmented cells) and the outer layer (formed of pigmented cells).
Choroid
- The choroid has a black color and functions to nourish the outer part of the retina.
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