Questions and Answers
What is the function of ceruminous glands in the external auditory meatus?
What type of epithelium covers the tympanic membrane?
Which part of the eye is formed of dense irregular connective tissue?
What is the function of the choroid in the eye?
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What is the function of the external ear pinna?
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What is the characteristic of the epithelium lining the middle ear cavity?
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What determines the color of the eye?
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What is the structure of the ciliary body epithelial cells?
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Study Notes
Ear
- The ear is divided into three parts: external ear, middle ear, and inner ear (Cochlea).
- The external ear consists of:
- Ear pinna (formed of elastic cartilage covered with thin, hairy skin), which directs sound waves to the inside.
- External auditory meatus (a flattened canal extending from the ear pinna to the tympanic membrane), lined with thin skin containing hair follicles, sebaceous glands, and ceruminous glands that secrete a brownish semisolid wax.
- The tympanic membrane (ear drum) is covered with simple cubical epithelium and transmits sound vibrations from the outer ear to the bony ossicles of the middle ear.
Middle Ear
- The middle ear cavity is lined with simple cubical cells.
Eye
The Eye Wall
- The eye wall consists of three layers:
- Outer fibrous layer (supporting):
- Cornea (anterior portion) with stratified squamous non-keratinized epithelium.
- Sclera (posterior portion) formed of dense irregular connective tissue.
- Middle vascular layer (vascular and pigmented):
- Iris.
- Ciliary body.
- Choroid.
- Inner nervous layer:
- Retina.
- Outer fibrous layer (supporting):
Eye Color
- Eye color is determined by the amount of melanin in the iris pigmented epithelium on the back of the iris.
Ciliary Body
- The epithelial cells of the ciliary body are formed of two layers: inner (non-pigmented cells) and outer (pigmented cells).
Choroid
- The choroid has a black color and functions to nourish the outer part of the retina.
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Description
This quiz covers the different parts of the ear, including the external ear, middle ear, and inner ear. It also explains the functions of each part and their structure.
