Out of the following, the bony labyrinth of inner ear consists:

Appeared in: AIIMS Manglagiri NO - 2019

Explanation

The bony labyrinth is the rigid, outer wall of the inner ear, located in the petrous part of the temporal bone.
It consists of three main parts: the cochlea, the vestibule, and the semicircular canals.
The cochlea is the auditory portion of the inner ear, shaped like a snail shell.
It contains the organ of Corti, the sensory organ of hearing, which transduces sound vibrations into nerve impulses.

Option A: The auditory ossicles (malleus, incus, and stapes) are located in the middle ear, not the inner ear's bony labyrinth.
Option B: The auditory canal, or external acoustic meatus, is a component of the external ear.
Option D: The pinna, or auricle, is the visible outer part of the ear and belongs to the external ear.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the Inner Ear as background academic context rather than a clinical decision trigger.
Understanding the anatomy of the inner ear is crucial for diagnosing and managing disorders like Meniere's disease, labyrinthitis, and sensorineural hearing loss, which directly affect the structures of the bony labyrinth.
Damage to the cochlea, from loud noise exposure, ototoxic drugs, or aging, is a primary cause of permanent hearing loss.
What if? If a patient presents with vertigo (a sensation of spinning) and hearing loss, a nurse should suspect an inner ear disorder affecting both the vestibular system (semicircular canals, vestibule) and the cochlea. This would prompt a focused neurological and auditory assessment.

How to Approach the Question

First, identify the key terms in the question: 'bony labyrinth' and 'inner ear'.
Recall the three main divisions of the ear: external, middle, and inner.
Mentally list or visualize the structures belonging to each division.
Evaluate each option to determine its location within the ear.
Eliminate 'Auditory ossicles' as they are in the middle ear.
Eliminate 'Auditory canal' and 'Pinna' as they are parts of the external ear.

Concept Tested & Keywords

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E6 Histology Inderbir 11e p. 171-173

E6 Physiology Ganong 27e Vol 2 Part 3 p. 1

E6 Anatomy Applied Ashalatha 4e p. 238-240

Practise the full AIIMS Manglagiri NO - 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.