Anatomy, Eye

Anatomic Model Of The Human Right Eye Lateral View. The Eye, Lying On The Orbital Fat In Yellow, Is Enclosed In The Orbit. This Cavity Is Delimited Mainly By The Frontal Orbital Apex And Side Wall, Sphenoid Behind, Zygomatic Medial Wall, Towards The Nasal Crest Bones And The Maxilla Roof And Lateral Wall Of The Orbit. The Eyeball Is Composed Of An Outer Fibrous Coat, Consisting Of The Sclera A White Opaque Tunic And, In Front, The Cornea, A Transparent Membrane Allowing To Focus The Image. A Window Is Here Opened Sideways Through The Three Layers Of The Eyeball External Tunic, Uvea And Retina In Order To Show The Blood Vascularization. Six Extraocular Muscles In Red Govern The Eye Movements. In The Vertical Plane, The Inferior And Superior Rectus Muscles Lowers And Raises The Look, Respectively. Horizontally Situated, The Lateral And Medial Rectus Muscles Turn The Look Outwards And Inwards, Respectively. The Superior Oblique Muscle Performs The Eye Rotation Downwards And Outwards ; It Ends By A Tendon In White That Goes Across A Ring Shaped Like A Pulley, The Trochlea, And Then Is Attached To The Posterolateral Side Of The Eyeball. The Inferior Oblique Muscle, Lying On The Orbital Roof, Turns The Eye Upwards And Outwards. These Various Muscles Are Posteriorly Bound Together To A Tendinous Ring, The Common Annular Tendon Bluish, Which Also Receives The Optic Nerve In White Transmitting The Visual Data To The Brain. (Photo By BSIP/UIG Via Getty Images)