36th Exam (Jan 2024) Morning Q22 Kaigo Fukushishi
Question (original Japanese)
中耳にある耳小骨として、正しいものを1つ選びなさい。
- 1ツチ骨
- 2蝶形骨
- 3前頭骨
- 4頬骨
- 5上顎骨
Show answer
Correct answer 1
Key pointThe auditory ossicles are the malleus, incus, and stapes.
Explanation
The auditory ossicles of the middle ear are three bones, from the eardrum side: the malleus, incus (キヌタ骨), and stapes (アブミ骨). They transmit the vibration of the eardrum to the inner ear, so 1 is correct.
- 2: The sphenoid bone is a skull bone in the center of the base of the skull, so it is wrong.
- 3: The frontal bone is the skull bone that forms the forehead, so it is wrong.
- 4: The zygomatic bone is a facial bone that forms the cheek prominence, so it is wrong.
- 5: The maxilla is a facial bone that forms the upper jaw, so it is wrong.
Explanation in Japanese
中耳の耳小骨は、鼓膜側からツチ骨・キヌタ骨・アブミ骨の3つで、鼓膜の振動を内耳に伝えるので1が正しい。
- 2：蝶形骨は頭蓋底の中央にある頭蓋骨なので誤り。
- 3：前頭骨は額を形づくる頭蓋骨なので誤り。
- 4：頬骨は頬の隆起を形づくる顔面骨なので誤り。
- 5：上顎骨は上あごを形づくる顔面骨なので誤り。