With these increased motions of the puncta lacrymalia those of the excretory duct of the lacrymal gland are associated from their having so perpetually acted together.
Or the secretion of tears is increased by the association of the motions of the excretory duct of the lacrymal sack with ideas of tender pleasure, or of hopeless distress, as explained in Sect.
An instance of the second is in the sympathy between the excretory duct of the lacrymal gland, and the nasal duct of the lacrymal sack.
The increased secretion of tears is occasioned in a similar manner by any stimulating material in the eyes; which affects the excretory ducts of the lacrymal glands.
Outside of the eyeball, in the loose, fatty tissue of the orbit, in the upper and outer corner is the lacrymal or tear gland.
Look in a mirror, and the small lacrymal point, or opening into the nasal duct, may be observed.
Lacrymal Canals, Lacrymal Sac, and Nasal ducts, opened by their Anterior Portion.
Thence the nerve impulses travel to the lacrymal glands, leading to an increased flow of their secretion.
The lacrymal or tear gland is under the control of the nervous system.
The apparatus producing this secretion consists of the lacrymal or tear gland and lacrymal canals or tear passages (Fig.
Showing the Relative Position of the Lacrymal Apparatus, the Eyeball, and the Eyelids.
In these cases the glands secrete the fluid in such quantities that it cannot escape by the lacrymal canals, and the excess rolls over the cheeks as tears.
The lacrymal canals are at times blocked by inflammation of the nasal duct, and the fluid collects in the corners of the eyelids and overflows down the cheeks, producing much inconvenience.
Below A is seen a small conical elevation, with black dots (the lacrymal papilla or caruncle).
Here in each lid is a little reddish elevation, or lacrymal caruncle, in which is an opening, communicating with a small canal in the lid which joins the lacrymal sac, lodged between the orbit and the bridge of the nose (Fig.
There are two lacrymal glands, one in front and one behind; thelacrymal duct opens into the posterior nares.
When normally developed they are susceptible of a slight movement under the transparent disc, quite independent from the cornea, which covers them, and from which they are separated by the so-called "lacrymal chamber.
The lacrymalgland drinks up a certain fluid from the circumfluent blood, and pours it on the ball of the eye, on the upper part of the external corner of the eyelids.
The throat, stomach, and intestines, may be considered as one great gland; which like the lacrymal sack above mentioned, neither begins nor ends in the circulation.
The lacrymal is always present, and perforated by a glandular duct.
The secretions of the mucous membrane of the nasal cavity, and a pair of naso-lacrymal glands (not to be confounded with the Harderian and the lacrymal glands), moisten and clean the chamber.
The lacrymal duct first appears in Amphibia, and is present in all the higher Vertebrates.
In the Fowl the lacrymal duct is formed as a solid ridge of the epidermis, extending along the line of the so-called lacrymal groove from the eye to the nasal pit (fig.
In Lacertilia the lacrymal duct arises very much in the same manner as in Amphibia, though its subsequent growth is somewhat different.
Lacrymal glands are found in the Sauropsida and Mammalia.
The upper extremity of the duct dilates to form a sack, from which two branches pass off to open on the lacrymal papillae.
In Amphibia he finds that the lacrymal duct arises as a solid ridge of the mucous layer of the epidermis, continued from the external opening of the nasal cavity backwards towards the eye.
Besides these bones there is usually present in the higher forms a lacrymal bone on the anterior margin of the orbit derived from one of a series of periorbital membrane bones frequently found in Fishes.
A similar arrangement is permanent through life in Ophidia and some Lacertilia; and there is a chamber formed between the coalesced eyelids and the surface of the cornea, into which the lacrymal ducts open.
The ridge now loses its connection with the external skin, and, becoming hollow, forms the lacrymal duct.
The lacrymal canal, and its excretory canals, can only be seen on preparations in spirits of wine.
The eye is small, and not provided with a true lacrymal apparatus.
We have seen that the internal parts of the eye, under certain conditions act in a reflex manner on the lacrymal glands.
In a large number of cases, as with the salivary and lacrymal glands, intestinal canal, &c.
It would appear, as already remarked, that the lacrymal glands do not, from the want of practice or some other cause, come to full functional activity at a very early period of life.
The internal parts of the eye likewise act, under certain conditions, in a reflex manner on the lacrymal glands.
This circumstance is not exclusively due to the lacrymal glands being as yet incapable of secreting tears.
Of this latter fact we have indeed clear evidence in her eyes becoming slightly suffused with tears; and we can understand this, as the lacrymal glands are less under the control of the will than the facial muscles.
Sympathy appears to constitute a separate or distinct emotion; and it is especially apt to excite the lacrymal glands.
Nicolas Steno, or Stensen, described with accuracy (1660) the lacrymalgland and passages, and rediscovered the parotid duct.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "lacrymal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
