Tears normally flow from the lacrimal sac into the:
a. Lacrimal gland
b. Lacrimal canaliculi
c. Lacrimal puncta
d. Nasolacrimal duct

검증된 단계별 안내

Step 1: Understand the anatomy of the lacrimal apparatus, which is responsible for tear production and drainage. The lacrimal apparatus includes the lacrimal gland, lacrimal canaliculi, lacrimal sac, and nasolacrimal duct.

Step 2: Recall the flow of tears. Tears are produced by the lacrimal gland, located in the upper outer part of the orbit. They flow across the eye surface to keep it moist and then drain into the lacrimal puncta, small openings located at the inner corner of the eyelids.

Step 3: From the lacrimal puncta, tears enter the lacrimal canaliculi, which are small channels that transport tears to the lacrimal sac.

Step 4: Tears collect in the lacrimal sac, which is located in a groove formed by the lacrimal bone and maxilla. From the lacrimal sac, tears flow into the nasolacrimal duct.

Step 5: The nasolacrimal duct carries the tears into the nasal cavity, specifically into the inferior meatus of the nose. This explains why your nose may run when you cry.

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주요 개념

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Lacrimal System Anatomy

The lacrimal system is responsible for tear production and drainage. It includes the lacrimal gland, which produces tears, and a series of ducts and puncta that facilitate the movement of tears from the eye to the nasal cavity. Understanding this anatomy is crucial for identifying the correct pathway tears take after being produced.

Tear Drainage Pathway

Tears flow from the lacrimal sac through the nasolacrimal duct into the nasal cavity. The drainage begins at the lacrimal puncta, small openings on the eyelids, which lead to the lacrimal canaliculi. This pathway is essential for maintaining eye moisture and preventing overflow of tears.

Function of the Nasolacrimal Duct

The nasolacrimal duct is a key structure in the lacrimal system that channels tears from the lacrimal sac to the nasal cavity. Its function is vital for proper tear drainage, and any obstruction can lead to excessive tearing or infections. Recognizing its role helps in understanding the overall process of tear management.

Tears normally flow from the lacrimal sac into the:a. Lacrimal glandb. Lacrimal canaliculic. Lacrimal punctad. Nasolacrimal duct