Superior oblique muscle is supplied by: March 2005

Ans. B: Fouh cranial nerveEach extraocular muscle is innervated by a specific cranial nerve:Medial rectus (MR) -- cranial nerve III (Oculomotor)Lateral rectus (LR) -- cranial nerve VI (Abducens)Superior rectus (SR) -- cranial nerve III (Oculomotor)Inferior rectus (IR) -- cranial nerve III (Oculomotor)Superior oblique (SO)--cranial nerve IV (Trochlear)Inferior oblique (I0) --cranial nerve III (Oculomotor) The following can be used to remember the cranial nerve innervations of the six extraocular muscles:LR6 (SO4)3.That is, the lateral rectus (LR) is innervated by C.N. 6, the superior oblique (SO) is innervated by C.N. 4, and the four remaining muscles (MR, SR, IR, and RD) are innervated by C.N. 3.