Anatomy Bones and Muscles · MU Pleven

190. Central part of the eyeball, ocular chambers.

Covers the chambers of the eyeball: the anterior and posterior chambers filled with aqueous humour, with its production by the ciliary processes and its circulation through the pupil and Sclemm's canal, and the vitreous chamber behind the lens. It then moves to the extraocular muscles, giving a table of origin, insertion, innervation and function for the eyelid-raising and six eye-moving muscles, and ends with the layers of the eyelids, the tarsus and ligaments, and the eyelid blood supply.

Inside: 8 sections · 8 labelled pictures · 1 table · 10 flashcards · 5 min

Topic 189 of 236 in the MU Pleven syllabus for Anatomy Bones and Muscles (Medicine, Year 2). The free AceMed note covers it in 8 sections, about 523 words (5 min of reading), with 10 flashcards.

In this note

  1. CHAMPERS of the eyeball
  2. Anterior chamber :
  3. Posterior chamber :
  4. Postremal (vitreous) chamber.
  5. EXTRAOCULAR MUSCLES
  6. EYELIDS
  7. Layers :
  8. Blood Supply:

Anterior chamber :

  • Located between the Cornea and the iris
  • Filled with aqueous humor fluid.
  • The anterior chamber contributes to maintaining the shape of the cornea & provides nutrients to the corneal endothelium.

Posterior chamber :

  • Positioned between the iris, the zonule fibers and the lens.
  • Also filled with the aqueous humor.
  • Supports the lens & helps maintain its position.

* Aqueous Humor: is a clear, watery fluid. Produced by ciliary processes of the ciliary bodies.

  • ↓ secreted to
  • the post. chamber
  • ↓ flows through the pupil
  • ant. chamber
  • ↓ absorbed into the scleral venous sinus
  • ← through Sclemm Canal

Postremal (vitreous) chamber.

  • Located between the lens & the retina.
  • Filled with vitreous humor.
  • Provide structural support of the eye & helps maintain its shape.

EXTRAOCULAR MUSCLES

There are two groups of muscles within the orbit:

  • extrinsic muscles of eyeball (extra-ocular muscles) involved in movements of the eyeball or raising upper eyelids, and
  • intrinsic muscles within the eyeball, which control the shape of the lens and size of the pupil. (ciliary muscle, sphincter pupillae, dilator pupillae.

Of the seven muscles in the extrinsic group of muscles, one raises the eyelids, whereas the other six move the eyeball itself.

optic n. Common tendonious ring surrounding the optic n. at its entrance at the apex of the orbit.

* Lesser wing of the sphenoid bone:

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