. Human embryology and morphology. Embryology, Human; Morphology. SENSE OF SIGHT. 183 isc to the lens. With the gradual obliteration of the artery, the ipsule of the lens becomes thin and clears up. A foetus born ia le seventh month is blind, because of the vascular and opaque ipsule of the lens. The anterior part of the capsule—filling the upil— is the membrana pupillaris. The part of the hyaloid rtery within the optic nerve persists as the central artery of the 3tina. The canal of the artery within the vitreous humour, from le optic disc to the lens, remains as the hyaloid canal—a lymph ath.
. Human embryology and morphology. Embryology, Human; Morphology. SENSE OF SIGHT. 183 isc to the lens. With the gradual obliteration of the artery, the ipsule of the lens becomes thin and clears up. A foetus born ia le seventh month is blind, because of the vascular and opaque ipsule of the lens. The anterior part of the capsule—filling the upil— is the membrana pupillaris. The part of the hyaloid rtery within the optic nerve persists as the central artery of the 3tina. The canal of the artery within the vitreous humour, from le optic disc to the lens, remains as the hyaloid canal—a lymph ath. The hyaloid artery may persist and cause partial or com- lete blindness. It disappears some days after birth in cats and ibbits. (4) The Aqueous chamber, a space formed in the mesoblast which es between the epiblast of the cornea and the lens (Fig. 148). Part f this mesoblast becomes the anterior capsule of the lens; part ecomes the connective-tissue basis of the cornea. The aqueous hamber is simply an enlarged lymph space formed between these sro parts. Up to the time of birth the lens lies almost in contact rith the cornea (Fig. 149).. hyaloid canal orbit, pi. front, presphen. orbit, connect, tis. basis of Tenon's capr^f^^^ dental sacs. SUP- max. Fin. 140.—Section of the Eye and Orbit at birth. (5) The choroid, ciliary processes, and iris.—These form the iddle or vascular tunic of the eye, and are developed out of the esoblast which covers the optic cup. They form a vascular and gmented covering through which the optic cup is nourished, le ciliary muscle is formed in this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
