Q86 / 200 · MHT CET - Medical 2026 (23 April Shift 2) · Biology
Arrange the following parts of the ear in the correct sequence of sound transmission from outside to inside.
1. Tympanic membrane
2. Cochlea
3. Pinna
4. Auditary ossicles
5. Oval window
1. Tympanic membrane
2. Cochlea
3. Pinna
4. Auditary ossicles
5. Oval window
- Correct answerA3--1---4--5--2
- B1--3--4--2--5
- C3--4--1--5--2
- D1--4--3--5--2
Solution
Sound waves are collected by the pinna and directed inwards through the external auditory meatus.
The sound waves strike the tympanic membrane (ear drum), causing it to vibrate.
These vibrations are transmitted through the auditory ossicles (malleus, incus, and stapes) in the middle ear.
The stapes passes the vibrations to the oval window.
From the oval window, the vibrations are transferred to the fluid in the cochlea, where they generate nerve impulses.
The correct sequence is Pinna $\rightarrow$ Tympanic membrane $\rightarrow$ Auditory ossicles $\rightarrow$ Oval window $\rightarrow$ Cochlea.
This corresponds to the sequence 3, 1, 4, 5, 2.
Answer: 3--1---4--5--2
The sound waves strike the tympanic membrane (ear drum), causing it to vibrate.
These vibrations are transmitted through the auditory ossicles (malleus, incus, and stapes) in the middle ear.
The stapes passes the vibrations to the oval window.
From the oval window, the vibrations are transferred to the fluid in the cochlea, where they generate nerve impulses.
The correct sequence is Pinna $\rightarrow$ Tympanic membrane $\rightarrow$ Auditory ossicles $\rightarrow$ Oval window $\rightarrow$ Cochlea.
This corresponds to the sequence 3, 1, 4, 5, 2.
Answer: 3--1---4--5--2
Hence, the correct answer is option: 'A'.