Microbiology Final Micro

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True or False.
Mammals have the sharpest hearing of all of the animals. This is due to the fact that they have all evolutionarily developed very similar structures for auditory perception.

True and False. Mammals have the sharpest sense of hearing but also display a wide variety and diversity in their hearing.
This part of the ear helps to collect sound waves and delivers them to the middle ear.

External ear
Along with the external ear, two other structures contain elastic cartilage. What are these two other structures? (hint: all three start with the letter E)
- External ear
- Eustachian tube
- Epiglottis
Sound waves are alternating waves of air pressure with periods of ___________ and ___________.

Compression and Rarefaction
What characteristic of sound waves is a function of the frequency of sound waves? What units are used to measure this?

Pitch. Pitch is measured in Hertz (cycles per second)
What is the audible range for humans?

20Hz to 20kHz.
Our interpretation of sound intensity that is a function of the wave amplitude or the pressure difference between waves is called what? It is measured with what logarithmic scale?

Loudness. Loudness is measured on the decible scale (dB)
True or False.
The chain of ossicles (small bones in the ear) have already reached full adult dimensions and rigidity at the time of birth.

True. The external ear, middle ear, cochlea and outermost hair cells (auditory receptors) continue to develop for different amounts of time after birth. The ossicles, however, reach adult dimensions and rigidity at birth.
True or False.
All parts of the ear are derived from the same embryological germ layer.

False. Various parts of the ear are developed from all three germ layers.
The glands near the external ear whose name is derived from the Latin word for "wax" are called what? What is their secretory substance called?

Ceruminous glands secrete cerumen.
What are the names of the three ear bones and in which part of the ear are they located?
- Malleus (hammer)
- Incus (anvil)
- Stapes (stirrup)
- These three bones are located in the middle ear
True or False.
The eustachian tube lise flat and, if opened, allows for the equalization of pressure between the middle ear and the nose.

False. The eustachian tube does allow for the equalization of pressure, but it does so between the middle ear and the throat (links middle ear to pharynx)
If you could taste the paper triangle that was handed out in class you are a(n):

C. Super taster
True or false.
Enamel is the second hardest material in the body. Second only to the bones of the inner ear.

False. Enamel is the hardest substance in the body. It is about 95% inorganic content, 1% organic and 4% water.
How many ameloblasts does it take to secrete one full key-hole enamel rod unit?

Four
What is the difference between the cribiform plate and the cortical plates?

The cribiform plate faces the tooth and follows its general outline. The cortical plates face the cheek and lips(outer cortical plate) and the tongue(inner cortical plate).
Where is an interradicular crest or septum found?

This is the bone that is found in the furcation of a multi-rooted tooth.
True or False.
Interradicular crests are lined by cribiform plate.

True.
The holes found in cribiform plate where vasculature runs are known as ___________.

Volkmann's canals.
What are the types of fibers that can be found in the PDL?
- Oxytalan fibers (appear in large numbers when PDL is subjected to increased stress)
- Elaunin fibers
There are two types of nerve endings in the PDL. What are the two types and what are they responsible for?
- Free, unmyelenated nerve endings are responsible for pain sensation
- Encapsulated nerve endings are responsible for sensing pressure changes during mastication.

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Card Set

Microbiology Final Micro

Description

Micro final flascards

Updated

2010-09-30T00:18:11Z

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