This figure shows a cross section of a vertebra and the spinal cord.What structure does number 1 indicate? 
Definitions:
Hindbrain
The posterior part of the brain that includes the cerebellum and brainstem, responsible for regulating basic life functions.
Cerebellum
A part of the brain located at the back of the skull, vital for coordinating movement and maintaining balance.
Reticular Formation
A network of neurons located in the brainstem, involved in various functions including regulation of wakefulness and sleep.
Midbrain
A central part of the brainstem that plays an important role in vision, hearing, motor control, sleep/wake, arousal, and temperature regulation.
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