Even when the bird is placed in a comparatively dark room, where the rays of the sun cannot beat upon it, the eyes are continually blinking as long as they are open, and the large nictitating membrane is ever and anon drawn over them.
A term applied to a lachrymal gland on the inner side of the orbit of many animals which have a third eyelid, or nictitating membrane.
The nictitating membrane is often seen in the Cat when she slowly opens her eyes from a calm and prolonged sleep: it is well developed in the eagle, and enables him to gaze steadfastly on the sun's unclouded disk.
In connexion with the nictitating membrane the Harderian gland is developed, while the lachrymal gland secretes fluid for the other eyelids to spread over the conjunctiva.
The nictitating membrane or third eyelid is well-developed in amphibians, reptiles, birds and some few sharks; it is less marked in mammals, and in Man is only represented by the little plica semilunaris.
The eyes are large, and have a third eyelid, or nictitating membrane, to draw across the pupil during the day.
Our craniote ancestors had a third eye-lid, the nictitating membrane, which was drawn over the eye from its inner angle.
The apes and man have also lost the Harderian gland that opened under the nictitating membrane; we find this in the rest of the mammals, and the birds, reptiles, and amphibia.
Illustrations of the nictitating membrane in the various animals named drawn from nature.
At a much earlier period the uterus was double; the excreta were voided through a cloaca; and the eye was protected by a third eyelid or nictitating membrane.
Defn: A term applied to a lachrymal gland on the inner side of the orbit of many animals which have a third eyelid, or nictitating membrane.
This arises from the nasal surface of the ball, and its tendon passes into the somewhat imperfectly transparent nictitating membrane.
Walrus, development of the nictitatingmembrane in the; tusks of the; use of the tusks by the.
Monotremata, development of the nictitating membrane in; lactiferous glands of; connecting mammals with reptiles.
Muscles of the Eye-ball and of the Nictitating Membrane 9 8.
Eye of an Owl, showing the arrangement of the Nictitating Membrane 8 7.
In the arrangement of the muscle which, though placed behind the eye, draws the nictitating membrane in front of it, there is what justly deserves to be called a marvellous piece of mechanical contrivance.
The Lamnoid sharks agree with the cat-sharks in the absence of nictitating membrane or third eyelid, but differ in the anterior insertion of the first dorsal fin, which is before the ventrals.
None have the nictitating membrane, and in all the eggs are hatched internally.
We may place first, as most primitive, the forms withoutnictitating membrane.
Many of the sharks possess a distinct nictitating membrane or special eyelid, moved by a set of muscles.
The sixth pair, nervus abducens, passes also to muscles of the eye, and in sharks to the nictitating membrane or third eyelid.
In the Sauropsida all three eyelids are usually present, but in Mammalia the nictitating membrane is rudimentary.
In Elasmobranchii they are better developed, and the nictitating membrane is frequently present.
Note the large eyes, and at the inner angle of each the delicate nictitating membrane which can be drawn over the ball.
All reptiles, excepting the snakes and a few lizards, have movable eyelids, including a nictitating membrane like that of the birds.
Observe their swimming and diving, the retraction of head and limbs into the shell, the use of the third eyelid (nictitating membrane), and the swallowing of air.
In almost all mammals below the Primates there is a third lid, the nictitating membrane.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "nictitating" in a variety of sentences. We hope that you will now be able to make sentences using this word.
