金台診所醫學美容的部落格

Clinical notes on EOM



✅ MR 

• Origin: Annulus of Zinn

• Ms length: 40 mm 

• Tendon length: 3.6 mm 

• Insertion: 5.5 from 


✅ LR 

• Origin: Annulus of Zinn

• Ms length: 40 mm 

• Tendon length: 8.4 mm 

• Insertion: 6.9 mm from limbus 



✅ SR 

• Origin: Annulus of Zinn

• Ms length : 41 mm

• Tendon length: 5.4 mm 

• Insertion: 7.7 mm from limbus 

✅ IR 

• Origin: Annulus of Zinn

• Ms length: 40 mm

• Tendon length: 5.0 mm 

• Insertion: 6.5 mm from limbus 


✅ SO 

• Origin: Sphenoid 

• Ms length: 32 mm

• Tendon length: From 10mm pre-trochlea 

• Insertion : Posterior superotemporal


✅ IO 

• Origin: Orbital floor 

• Ms Length: 34 mm

• Tendon length: Minimal 

• Insertion : posterior temporal

In other words ✍️✍️✍️✍️✍️

✅ The longest : LR ( 48.4 mm) 

✅ shortest : IO ( almost 34 mm)

✅ anterior origin: IO

✅ posterior origin : SO, IR,SR,MR, LR

✅ Anterior insertion : SR,LR,MR,IR

✅ posterior insertion: SO, IO

✅ nearest to limbus:MR( 5.5 mm)

✅farthest from limbus: SR ( 7.7 mm) 

✅ longest tendon: SO ( 10 mm)

✅ Shortest tendon: IO ( almost no tendon)

✅ 3 rd nerve supply: IR , SR, MR ,IO

✅ 6th nerve supply: LR

✅ 4th nerve supply : SO

✅ elevators : SR,IO

✅depressors : IR, SO

✅ abductors : LR ,SO, IO

✅ Adductors : MR , SR, IR

✅ intorters : SO, SR

✅extorters : IO, IR