Summary
The hyaloid vascular system of the pig was studied from 4 weeks of gestation until 2 weeks after birth by means of semithin sections and vascular corrosion casts. The vascular tunic of the lens is supplied by the posterior lens branches of the hyaloid artery (at the posterior lens pole), by the intermediate lens branches of the proper hyaloid arteries (at the lens equator) and by the anterior lens branches of the radial iridial arteries (at the anterior lens pole). Venous drainage takes place via the venous lens branches which leave the lens anteriorly and drain into the radial iridial veins. Regression of the vascular tunic of the lens occurs during the second half of fetal life and is nearly completed in the first postnatal days. The involution first affects the proper hyaloid arteries and their intermediate lens branches. Subsequently, the posterior lens branches regress, whereas the anterior lens branches in the pupillary membrane disappear in the perinatal period only.
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Abbreviations
- 1 :
-
Hyaloid artery
- 2 :
-
proper hyaloid arteries
- 3 :
-
annular plexus
- 4 :
-
posterior lens branches
- 5 :
-
intermediate lens branches
- 6 :
-
major arterial circle of the iris
- 7 :
-
radial iridial arteries
- 8 :
-
anterior lens branches
- 9 :
-
venous lens branches
- 10 :
-
radial iridial veins
- 11 :
-
retinal blood vessel
- C :
-
Cornea
- CP :
-
ciliary processes
- I :
-
iris
- L :
-
lens
- ON :
-
optic nerve
- PM :
-
pupillary membrane
- R :
-
retina
- VTL :
-
vascular tunic of the lens. White bar in Figs. 4–16=1 mm
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De Schaepdrijver, L., Simoens, P., Lauwers, H. et al. The hyaloid vascular system of the pig. Anat Embryol 180, 549–554 (1989). https://doi.org/10.1007/BF00300552
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DOI: https://doi.org/10.1007/BF00300552