In general, the last muscle to be rendered akinetic with a retrobulbar anesthetic block is –: (A) Superior rectus, (B) Superior oblique, (C) Inferior oblique, (D) Levator palpebral superioris
Answer is B. A properly placed retrobulbar injection is effective within seconds and blocks all extraocular muscles except the superior oblique muscle, affects the ciliary ganglion and anesthetizes the entire globe.