Superior orbital fissure [Practical examination]

Superior orbital fissure

1. Identify the probed foramen. [1]
2. mention the structures passing through it . [3]

Location: It is present in the superior wall of orbit

Shape: Retort shaped

Features

• It is the gap present between greater and lesser wings of sphenoid bone.
• It is completed laterally by the frontal bone uniting the two wing

The dimensions of various nerves

• Optic nerve: Thickest sensory cranial nerve. It contains 1 million neurons.
• Lower division of oculomotor nerve is thicker as compared to upper division. It has more branches.
• Trochlear and abducent nerves are less thick than oculomotor nerve.
  
• Nasociliary is thin nerve