The Outer Ear Flashcards
How deep is the average external ear canal?
2.5 cm
The external auditory meatus and external auditory canal are lined with what?
Keratinising Squamous Epithelium or flat skin cells
The outer 1/2 of the canal contains what two glands?
Cerumenous glands that produce ear wax and Sebaceous glands that produce sebum
The inner 1/2 of the canal contains which gland?
Apocrine glands that maintain moisture and acidity levels of the canal
What does the ‘P’ in PAL stand for?
Protection - the ear canal is protected by hair, the bent shape of the canal, by temperature and climate
What does the ‘A’ in PAL stand for?
Amplification - the shape of the pinna means that some sounds pass through better than others, this is known as resonance
What does the ‘L’ in PAL stand for?
Localisation - this helps the brain determine where sound is arriving from.
What is Dextral?
Right
What is Sinistral?
Left
What is Medial?
Towards midline
What is Lateral?
Away from midline
What is Distral?
Away from something
What is Proximal?
Towards something
What is Superior?
Above the waist
What is Inferior?
Below the waist
