Put these structures in the order in which a sound passes through them…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Put these structures in the order in which a sound passes through them.
(1) Stapes (2) Basilar membrane (3) Tympanic membrane (4) Malleus (5) Oval window (6) Incus (7) External auditory canal
- Write the order of the numbers.
- Which structure makes nerve impulses?
Need a reminder? The key ideaShow
Sound goes from the pinna and the canal to the ear drum, then through the malleus, incus and stapes to the oval window. Then it goes through the cochlear fluid to the basilar membrane and the hair cells of the organ of Corti. The auditory nerve takes the impulses to the brain. Pressure is force divided by area, and a gain in decibels is of the pressure ratio.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) External auditory canal (7), tympanic membrane (3), malleus (4), incus (6), stapes (1), oval window (5), basilar membrane (2). The order is 7, 3, 4, 6, 1, 5, 2.
Step 2. (b) The hair cells of the organ of Corti, on the basilar membrane, make the nerve impulses, in the afferent neurons that touch them.
Answer: (a) 7, 3, 4, 6, 1, 5, 2; (b) the hair cells.
Watch out. The malleus is attached to the ear drum, and the stapes is attached to the oval window.
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