The correct answer is Option (4) - Pinna
The structure that is NOT a part of the brain from the given options is the Pinna.
Here's an explanation of each option:
- Medulla: The medulla oblongata, often referred to simply as the medulla, is located at the base of the brainstem. It is a vital part of the brain involved in controlling autonomic functions such as heartbeat, breathing, blood pressure, and reflex actions like coughing and sneezing.
- Thalamus: The thalamus is a paired structure located deep within the brain, situated above the brainstem and beneath the cerebral cortex. It serves as a relay center for sensory information, relaying signals to and from various parts of the brain. It plays a crucial role in sensory perception, motor control, and regulation of consciousness and sleep.
- Pons: The pons is a region of the brainstem located above the medulla and below the midbrain. It serves as a bridge connecting different parts of the brain, including the cerebellum and the cerebral cortex. The pons is involved in various functions, including sleep, respiration, swallowing, bladder control, hearing, equilibrium, taste, eye movement, facial expressions, and posture.
- Pinna: The pinna, also known as the auricle, is the visible outer part of the ear that collects sound waves and directs them into the ear canal. While the pinna is a crucial structure for the process of hearing, it is not a part of the brain. Instead, it is an external anatomical feature of the ear.
Therefore, the correct answer is the Pinna, as it is an external structure of the ear and not a part of the brain. |
