The following diagram is of a cross-section of a plant leaf. Use the diagram to answer the question. 
-The main function associated with structure Y is ________.
Definitions:
Epidural Analgesic
A method of pain relief involving the injection of drugs into the epidural space of the spinal cord.
Dural Puncture
A medical procedure involving the penetration of the dura mater, often during epidural administrations.
Headache
A pain or discomfort in the head, scalp, or neck area, often caused by stress, tension, illness, or environmental factors.
Catheter Migration
The unintended movement or displacement of a catheter from its original position, potentially causing ineffective treatment or harm.
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