What do you know about lacrimal glands? Quiz

The nostrils are not part of the lacrimal passage. The lacrimal passage consists of the lacrimal sac, puncta, canaliculi, and nasolacrimal duct. The nostrils, also known as the nares, are the openings in the nose through which air enters and exits the respiratory system. They are not involved in the drainage of tears, which is the function of the lacrimal passage.

The statement is true because eyelids and their blinking action play a crucial role in distributing tears across the cornea and transporting tears to the puncta. When we blink, the eyelids spread tears over the surface of the eye, ensuring that it remains moist and lubricated. The tears are then drained through tiny openings called puncta, which are located at the inner corners of the eyelids. This process helps to maintain the health and function of the eyes.

The explanation for the given correct answer is that sympathetic fibers of the lacrimal gland do indeed originate from the superior cervical ganglion and are carried by the internal carotid plexus and deep petrosal nerve. These sympathetic fibers then join with the parasympathetic fibers in the nerve of the pterygoid canal and follow the same route to supply the gland. Therefore, the statement is true.

The canaliculi carry tears to the lacrimal sac. Tears are produced by the lacrimal glands and spread across the surface of the eye. The excess tears are drained through small openings called puncta located on the upper and lower eyelids. From the puncta, the tears enter the canaliculi, which are small channels that connect the puncta to the lacrimal sac. The lacrimal sac then further drains the tears into the nasolacrimal duct, which ultimately leads to the nasal cavity. The inferior concha is a bone structure in the nasal cavity and is not involved in tear drainage.

The lacrimal nerve innervates the sensory part of the lacrimal gland.

The orbital and palpebral parts of the lacrimal gland are separated by the Tendon Levator palpebral superior.

The statement is false because the lacrimal gland consists of a large deep orbital part and a small superficial palpebral part.

The palpebral part of the Lacrimal gland is not innervated by the supratrochlear nerve. The supratrochlear nerve innervates the skin of the forehead and scalp, not the lacrimal gland.

The lacrimal excretory system drains tears from the lacus lacrimalis into the inferior meatus. The inferior meatus is a passage located in the nasal cavity, below the middle and superior conchae. It is the final destination for tears that are produced by the lacrimal glands and flow through the lacrimal ducts. From the inferior meatus, tears eventually drain into the nasopharynx and are swallowed.

The main gland and accessory glands secrete a tear film that protects the ocular surface and helps maintain optimal vision. The tear film is composed of three layers: the lipid layer, produced by the meibomian glands in the eyelids; the aqueous layer, produced by the main lacrimal gland; and the mucous layer, produced by the accessory glands in the conjunctiva. These layers work together to lubricate the eyes, prevent dryness, flush out debris, and maintain clear vision.

The upper part of the lacrimal sac is known as the fundus.

The parasympathetic innervation of the lacrimal gland involves the Nerve of pterygoid canal, zygomatic nerve, Great petrosal nerve, and Maxillary nerve. These nerves play a role in controlling tear production and secretion by the lacrimal gland. The Nerve of pterygoid canal carries parasympathetic fibers from the pterygopalatine ganglion to the lacrimal gland. The zygomatic nerve also carries parasympathetic fibers to the lacrimal gland. The Great petrosal nerve carries preganglionic parasympathetic fibers from the facial nerve to the pterygopalatine ganglion, which then innervates the lacrimal gland. The Maxillary nerve carries postganglionic parasympathetic fibers to the lacrimal gland.

The correct answer is "paired almond-shaped glands, located in a fossa on the anterosuperolateral aspect of the orbit." The lacrimal gland is indeed paired and has an almond shape. It is located in a fossa on the anterosuperolateral aspect of the orbit, which means it is situated in a depression on the front, upper, and outer side of the eye socket. This location allows the lacrimal gland to produce tears that can lubricate the surface of the eye.