Identify the anatomical structure indicated by the blue arrow in the image below and the correct level at which it pierces the diaphragm

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Options:
explanation: This image shows a view of the dissected thoracic and abdominal cavities with the diaphragm separating them. The diaphragm has multiple perforations which allow the passage of anatomical structures between the thorax and the abdomen. The aorta passes through the diaphragm at the level of the 12th thoracic vertebra (T12), not at T10. The following mnemonic is useful: I8 10eggs at 12 (Inferior vena cava – T8; Oesophagus – T10; descending aorta – T12).
name: Descending aorta – T10
label: b
answer: no
explanation: This image shows a view of the dissected thoracic and abdominal cavities with the diaphragm separating them. The diaphragm has multiple openings which allow the passage of anatomical structures between the thorax and the abdomen. The oesophagus, indeed, passes through the diaphragm at the level of T10. The oesophageal hiatus is located in the muscular part of the diaphragm and lies to the left of the aortic hiatus.  However, the structure indicated by the arrow is the aorta, which passes through the diaphragm at the level of the 12th thoracic vertebra (T12). The following mnemonic is useful: I8 10eggs at 12 (Inferior vena cava – T8; Oesophagus – T10; descending aorta – T12).
name: Oesophagus – T10
label: c
answer: no
explanation: This image shows a view of the dissected thoracic and abdominal cavities with the diaphragm separating them. The diaphragm has multiple openings which allow the passage of anatomical structures between the thorax and the abdomen. The aorta passes through the diaphragm at the level of the 12th thoracic vertebra (T12), slightly to the left of the midline. The following mnemonic is useful: I8 10eggs at 12 (Inferior vena cava – T8; Oesophagus – T10; descending aorta – T12).
name: Descending aorta – T12
label: a
answer: yes
explanation: This image shows a view of the dissected thoracic and abdominal cavities with the diaphragm separating them. The diaphragm has multiple openings which allow the passage of anatomical structures between the thorax and the abdomen. The inferior vena cava, indeed, passes through the diaphragm at the levels of T8, not T10. The inferior vena cava runs to the right of the vertebral column.  However, the structure indicated by the arrow is the aorta, which passes through the diaphragm at the level of the 12th thoracic vertebra (T12). The following mnemonic is useful: I8 10eggs at 12 (Inferior vena cava – T8; Oesophagus – T10; descending aorta – T12).
name: Inferior vena cava – T10
label: e
answer: no
explanation: This image shows a view of the dissected thoracic and abdominal cavities with the diaphragm separating them. The diaphragm has multiple openings which allow the passage of anatomical structures between the thorax and the abdomen. The inferior vena cava, indeed, passes through the diaphragm at the levels of T8. The inferior vena cava runs to the right of the vertebral column.  However, the structure indicated by the arrow is the aorta, which passes through the diaphragm at the level of the 12th thoracic vertebra (T12). The following mnemonic is useful: I8 10eggs at 12 (Inferior vena cava – T8; Oesophagus – T10; descending aorta – T12).
name: Inferior vena cava – T8
label: d
answer: no

Correct answer: a