The bony orbit is made up of parts of seven bones. The lateral wall is relatively substantial, while the other walls are quite thin. Blowout fracture from blunt trauma usually involves the floor separating the orbit from the maxillary sinus.
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Periosteum (also called periorbita) lines the orbital walls. An extension of periosteum forms the sling, or trochlea, for the superior oblique muscle. The periosteum is loosely attached and can be dissected away from the bone by bleeding,
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