Biomaterial Database

[Supplementary concepts in the physiopathology of the vitreous]. 1990

D C Begu, and M R Mănescu

Serviciul Oftalmologic, Policlinica nr. 1, Craiova.

The normal vitreous defends the posterior pole damping the traumatic and tension shocks coming from the anterior pole reducing their intensity according to formula P = F/S The buffering function decreases in direct proportion to the degree of fluidity of the vitreous, fluidity that enlarges the volume of the vitreous whereas the mass does not change according to the density formula p = m/v, the density of the liquefied vitreous being greatly diminished. The liquefied vitreous may lead to degenerative lesions of the retina due to prolonged tension of the retina resulting in ruptures and detachment. An anterior pole pressure of 15-16 mmHg transmitted non-modified to the posterior pole through the liquefied vitreous, exceeding by far the pressure of the opticoretinal tissular fluid pressure which in 9 mmHg leads to papillary excavation and glaucoma without tension; hence the liquefied vitreous must be replaced by a normal one or its density built up again.

UI	MeSH Term	Description	Entries
D007429	Intraocular Pressure	The pressure of the fluids in the eye.	Ocular Tension,Intraocular Pressures,Ocular Tensions,Pressure, Intraocular,Pressures, Intraocular,Tension, Ocular,Tensions, Ocular
D009900	Optic Nerve	The 2nd cranial nerve which conveys visual information from the RETINA to the brain. The nerve carries the axons of the RETINAL GANGLION CELLS which sort at the OPTIC CHIASM and continue via the OPTIC TRACTS to the brain. The largest projection is to the lateral geniculate nuclei; other targets include the SUPERIOR COLLICULI and the SUPRACHIASMATIC NUCLEI. Though known as the second cranial nerve, it is considered part of the CENTRAL NERVOUS SYSTEM.	Cranial Nerve II,Second Cranial Nerve,Nervus Opticus,Cranial Nerve, Second,Cranial Nerves, Second,Nerve, Optic,Nerve, Second Cranial,Nerves, Optic,Nerves, Second Cranial,Optic Nerves,Second Cranial Nerves
D012160	Retina	The ten-layered nervous tissue membrane of the eye. It is continuous with the OPTIC NERVE and receives images of external objects and transmits visual impulses to the brain. Its outer surface is in contact with the CHOROID and the inner surface with the VITREOUS BODY. The outer-most layer is pigmented, whereas the inner nine layers are transparent.	Ora Serrata
D005128	Eye Diseases	Diseases affecting the eye.	Eye Disorders,Eye Disease,Eye Disorder
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014822	Vitreous Body	The transparent, semigelatinous substance that fills the cavity behind the CRYSTALLINE LENS of the EYE and in front of the RETINA. It is contained in a thin hyaloid membrane and forms about four fifths of the optic globe.	Vitreous Humor,Bodies, Vitreous,Body, Vitreous,Humor, Vitreous,Humors, Vitreous,Vitreous Bodies,Vitreous Humors