88 MUSCULAR SYSTEM. 



action of any two of them, will give the sight an oblique or inter- 

 mediate direction. 



OBLIQUUS SUPERIOR Vtl MAGNUS OC U LI-T ROCH LE A R I S. 



Situation. — Inner and upper part of the cavity of the orbit. 



Form. — Elongated, cylindroid ; somewhat narrowed, posteri- 

 orly ; anteriorly, curved at an acute angle towards the opposite 

 side. 



Attachment. — To the border of the optic foramen, and to the 

 upper and outer part of the sclerotic, near to the attachment of 

 the abductor. 



Relations. — Superiorly, with the orbital parietes and pathetic 

 nerve; inferiorly, with the adductor and supra-orbital branch of 

 the ophthalmic nerve. 



Direction. — Horizontal, but somewhat curved : inchning from 

 within outwards until it reaches the fore part of the cavity, where 

 it becomes reflected outwards and downwards, with an inclina- 

 tion backwards. 



Structure. — Posterior attachment tendinous and fleshy; ante- 

 rior, aponeurotic ; middle part, fleshy. At the inner canthus, 

 the fleshy part passes through a broad fibro-cartilaginous loop or 

 pulley, which is fixed to the posterior part of the frontal orbital 

 process. 



OBl-lQUUS 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 

 the lachrymal opening ; and to the inferior and outer side of the 

 sclerotic, close to the junction of the white with the transparent 

 part of the globe. 



Relations. — Inferiorly, with the floor of the orbit ; superiorly, 

 with the aponeurotic tendon of the depressor ; internally, with 

 the lachrymal sac. 



Structure. — Fleshy, included within a fibrous sheath. 



RETRACTOU Vcl RECTUS POSTERIOR OCULI. 



Situation. — ViQ\\\n6i the eyeball. 



Figure. — That of a hollow cone, with its base turned forwards. 



Attachment. — To the edge immediately surrounding the optic 

 foramen ; and to the posterior third of the entire superficies of the 

 globe of the eye. 



Relations. — Around its sides are the four straight muscles of 

 the eye, and in the interspaces a quantity of adipose matter : 

 through its middle runs the optic nerve. 



