iMUSCULAR SYSTEM. 87 



3._0CULAR REGION. 



LEVATOR PALPKBRiE SUPERIORIS INTERNUS. 



Orbitopalpebra/is. 



Si7//fl/ec?— Superiorly, between the eyeball and the orbit. 



Form. — Flat, tliin, fan-shaped : broad and expanded in front ; 

 narrow and tapering, behind. 



Attachment. — To the inner and upper part of the parietes of 

 the optic foramen ; and whole breadth of the border of the upper 

 lid. 



Relations. — Superiorly, with the fibrous lining of the orbit, 

 and the lachrymal gland : inferiorly, with the levator oculi and 

 sclerotica. 



Direction. — Oblique : from behind, forwards ; from below, 

 upwards ; and from within, outwards. 



Structure. — Posterior attachment, tendinous : anterior, apo- 

 neurotic ; intermediate part, fleshy, pale and delicate. 



Action. — To raise the upper eyelid. 



i SUPERIOR OCULI. \ 



VS INFERIOR OCULI. f 



BDUCTOR OCULI. — RECTUS EXTERNUS OCULI. t 



DDUCTOR OCULI. — RECTUS INTERNUS OCULI. J 



LEVATOR OCULI. RECTUS SUPERIOR OCULI 



DEPRESSOR OCULI. RECT 



A 



A 



Situation. — Within the orbit, at respective and equal distances 

 one from another, along the superior, inferior, and lateral parts 

 of the eyeball. 



Form. — Elongated, curved, conoid : broad parts turned for- 

 wards. 



Attachment. — To the circumferent parts of the optic foramen ; 

 and to four opposite points, equidistant one from another, of the 

 sclerotic, where it covers the front of the eyeball. 



Relations. — Externally, with the fibrous lining of the orbit ; 

 internally, with the sclerotic coat; in the middle, with the re- 

 tractor oculi. The levator oculi has also, above it, the levator 

 palpebrse internus. 



Direction. — Oblique : from within outwards, in the direction 

 of the visual axis; the levator, at the same time, winding up- 

 wards ; the depressor, downwards ; the abductor, to the outer 

 side; the adductor, to the inner side. 



Structure. — Posterior attachments tendinous and fleshy ; an- 

 terior, aponeurotic ; intermediate parts, fleshv. 



Action. — The levator will turn the sight of the eyeball up- 

 wards ; the depressor, downwards : the abductor, outwards ; the 

 adductor, inwards. All four muscles acting simultaneously will 

 draw the globe backwards, within the orbit. The combined 



