This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ocular motility and squint, Subject name: Ophthalmology
Retrobulbar injection is given in 
Select and explain. 
A. Inside muscle cone, B. Outside muscle cone, C. Subtenon space, D. Subperiosteum
A: Inside muscle cone
Answer: A: Inside muscle cone 
Explanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 444) *Retrobulbar injection:- Injection in retrobulbar space inside the muscle cone *Peribulbar injection:- Injection in peribulbar/retrobulbar space outside the muscle cone *Sub-tenon injection:- Injection beneath the tenon capsule, i.e. in subtenon space. It is also called parabulbar block Retrobulbar block involves depositing local anesthetic inside the muscle cone. It aims to block the ciliary nerves, the ciliary ganglion, and cranial nerves III, IV, and VI.