12.1.5 POJA-L4405+2595+
3374.
Eye lens
12.1.5 POJA-L4405+2595+3374
Title: Embryonal eye lens
Description:
(A, C): Lens, stain hematoxylin-eosin (black and white print), embryo human.
(A, 1) Cornea. (A, 2) Iris. (A, 3) Total lens. (A, 4) Posterior suture. (A, 5) Equatorial elongated nucleated lens cells.
The anterior cuboidal lens epithelial cells transform into equatorial elongated nucleated lens cells.
The posterior site of the lens is composed of long lens fibers and is only covered by a basement membrane.
(B): Lens in toto, posterior pole of lens, embryo human. The embryonal lens is enclosed and vascularized by a network of thin blood vessels (hyaloid arteries) that will disappear during the fetal period. The sutures shine through the branching blood vessels and at presence there
is almost no vitrous tissue detectable
(By courtesy of P. J. Ringens, MD PhD, former Head of the Dept. of Ophthalmology, VUMC, Amsterdam).
(C): Centrally thicker cells (= lens fibers, 3). Note serrated borders of individual lens cells tightly attached to each other.
Background: Generally the hyaloid artery disappears in the first trimester. Sometimes a persistent artery or its remnant is found in
adult eyes mostly centrally at the posterior site of the lens where originally the artery was located. Usually it is accompanied with a small cataractous opacity.
Keywords/Mesh: eye, lens, suture, embryo, histology, POJA collection
Title: Embryonal eye lens
Description:
(A, C): Lens, stain hematoxylin-eosin (black and white print), embryo human.
(A, 1) Cornea. (A, 2) Iris. (A, 3) Total lens. (A, 4) Posterior suture. (A, 5) Equatorial elongated nucleated lens cells.
The anterior cuboidal lens epithelial cells transform into equatorial elongated nucleated lens cells.
The posterior site of the lens is composed of long lens fibers and is only covered by a basement membrane.
(B): Lens in toto, posterior pole of lens, embryo human. The embryonal lens is enclosed and vascularized by a network of thin blood vessels (hyaloid arteries) that will disappear during the fetal period. The sutures shine through the branching blood vessels and at presence there
is almost no vitrous tissue detectable
(By courtesy of P. J. Ringens, MD PhD, former Head of the Dept. of Ophthalmology, VUMC, Amsterdam).
(C): Centrally thicker cells (= lens fibers, 3). Note serrated borders of individual lens cells tightly attached to each other.
Background: Generally the hyaloid artery disappears in the first trimester. Sometimes a persistent artery or its remnant is found in
adult eyes mostly centrally at the posterior site of the lens where originally the artery was located. Usually it is accompanied with a small cataractous opacity.
Keywords/Mesh: eye, lens, suture, embryo, histology, POJA collection