ANATOMY OF THE HORSE. 347 
Relations. —Externally, with the fibrous lining of the orbit; 
nternally, with the sclerotic coat; in the middle, with the re- 
ractor oculi. The levator oculi has also, above it, the levator 
)alpebrae internus. 
Direction. —Oblique : from within outwards, in the direction 
)f the visual axis; the levator, at the same time, winding up- 
vards; the depressor, downwards; the abductor, to the outer 
;ide ; the adductor, to the inner side. 
Structure. —Posterior attachments tendinous and fleshy; an- 
erior, aponeurotic; intermediate parts, fleshy. 
Action. —The levator will turn the sight of the eyeball up- 
vards; the depressor, downwards: the abductor, outwards ; the 
idductor, inwards. All four muscles acting simultaneously will 
Iraw the globe backwards, within the orbit. The combined 
iction of any two of them, will give the sight an oblique or inter- 
nediate direction. 
OBLIQUUS SUPERIOR Vel MAGNUS OCULI-TROCH LEARIS. 
Situation. - Inner and upper part of the cavity of the orbit. 
Form. —Elongated, cylindroid ; somewhat narrowed, posteri¬ 
ty; anteriorly, curved at an acute angle towards the opposite 
ide. 
Attachment. —To the border of the optic foramen, and to the 
ipper and outer part of the sclerotic, near to the attachment of 
he abductor. 
Relations. —Superiorly, with the orbital parietes and pathetic 
lerve; inferiorly, with the adductor and supra-orbital branch of 
he ophthalmic nerve. 
Direction. —Horizontal, but somewhat curved : inclining from 
vithin outwards until it reaches the fore part of the cavity, where 
t becomes reflected outwards and downwards, with an inclina- 
ion backwards. . . 
Structure. — Posterior attachment tendinous and fleshy; ante- 
ior, aponeurotic; middle part, fleshy. At the inner canthus, 
he fleshy part passes through a broadish fibro-cartilaginous loop 
>r pulley, which is fixed to the posterior inner part of the frontal 
>rbital process. 
OBLIQUUS INFERIOR Vel PARVUS OCULI. 
Situation .—Under the eyeball: antero-inferior part of the orbit. 
figure. —Broad, thick, cylindroid: ocular attachment broadest. 
Attachment.- —To a little depression in the os unguis, behind 
he lachrymal opening ; and inferior and outer side of the sclero- 
ic, close to the junction of the white with the transparent part of 
He globe. 
