Structures involved in blowout fractures include the
1. orbital floor
2. inferior rectus muscle
3. zygoma
a 1 only
b 1 and 2 only
c 2 and 3 only
d 1, 2, and 3

D) 1, 2 and 3

Explanation:

The floor of the orbit is the structure involved in the fracture by Reventon. On both sides of the face at the level of the midline we find the orbital cavities responsible for housing the eyeballs and their annexes. The zygomatic bone is part of the orbit floor. With orbital floor fractures, the prolapse of the orbital fat in the maxillary sinus can be considerable and the lower rectus muscle is equally compromised.

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