Orbit and ocular adnexae
Extraocular Muscles
- 6 muscles for movements of the globe
- 4 recti arising from the tendinous ring
- 2 oblique
- 1 further muscle for eyelid movement: levator palpebrae superioris
- The collagen tendons of the muscles blend with the scleral collagen
Clinical Correlate
Anterior segment ischaemia
- Two muscles can generally be removed safely
However removing four muscles will certainly cause ischaemia of the anterior segment and so concern develops when three are removed/operated on