Question

Eustachian tube connects
A. External ear and middle ear
B. External and pharynx
C. Middle ear and pharynx
D. Middle ear and inner ear

Answer 1

Hint: Eustachian also known as pharyngotympanic tube. It is made up of bone and cartilage. It is part of the tube. It helps in maintaining the air pressure in ear cavities during a change in surrounding pressure, yawning, and eating.

Complete answer:
Outer ear- It includes the pinna, opening leading to the auditory canal also known as external auditory meatus and auditory canal. The sound collected by the pinna and carried by the auditory canal. From the external auditory meatus, the sound enters the ear canal (auditory canal). Ear canal also secretes wax-like substance and having small hair both help in trapping dust particles. It protects your ear sensitive parts from irritable dust particles. The canal ends at the tympanic membrane.
Middle ear- Tympanic membrane is also known as the eardrum. The inner ear starts with a tympanic membrane. On the inner side of the tympanic membrane, there are three bones called the ear ossicles. Malleus focus stapes. The Eustachian tube starts from a tympanic member and ends in the pharynx. The stapes end in the oval window-like structure.
Inner ear- The oval window is the starting point of the inner ear. The inner ear is also known as the labyrinth.

So, the correct option is (C)-The eustachian tube connects the middle ear and pharynx.

Note: Eustachian is closed normally but open during swallowing, yawning, sneezing, and during a change in atmospheric pressure to maintain air pressure in the ear. Contraction of the tensor veli palatal muscle helps the eustachian tube in opening. Opening of the eustachian tube helps in equalizing the atmospheric pressure in the middle ear.