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Lacrimal Apparatus: Anatomy, Physiology, Pathology, Watering

Lacrimal Apparatus is the system which helps the secretion of tear fluid and its drainage. Here are the complete discussion of lacrimal apparatus i.e: Applied Anatomy, Applied Physiology, Drainage of tear, Watering, Pre-corneal tear film and Disease of Lacrimal gland and sac.

LACRIMAL APPARATUS

APPLIED ANATOMY:

Lacrimal Apparatus: Anatomy

A) Secretory Portion:

i)Lacrimal Gland

ii) Accessory Lacrimal Glands [Glands of Krause & Glands of Wolfring]

B) Drainage Portion:

i) Puncta: Superior & Inferior

ii) Canaliculi: Superior, Inferior, Common

iii) Lacrimal Sac

iv) Nasolacrimal Duct

APPLIED PHYSIOLOGY:

Tear is secreted from Lacrimal and Accessory Lacrimal Glands:

i) Evaporation

ii) Drain

iii) Form Aqueous Humour

DRAINAGE OF TEAR:  

Tear > Conjunctival Sac > Puncta > Inferior Canaliculi > Common Canaliculi > Lacrimal Sac > Nasolacrimal Duct > Inferior Meatus of Nose.

WATERING:

It is the overflow of tear fluid.

a) Lacrimation: Due to lacrimal hypersecretion.

b) Epipphora: Due to lacrimal drainage problem:

i) Obstruction

ii) Malposition due to Ectropion or Entropion

iii) Lacrimal Pump Failure

PRE-CORNEAL TEAR FILM:

Consists of [Outside to Inwards]

a) Lipid bilayer: Outer layer, secreted by the Mebomian glands.

b) Aqueous layer: Middle Layer, secreted by the Lacrimal gland.

c) Mucin layer: Inner layer, secreted by the Goblet cells of the conjunctiva.

DISEASES OF LACRIMAL GLAND:

a) Dacryoadenitis: Inflammation of lacrimal gland.

b) Tumour: Pleomorphic adenocarcinoma, Benign Mixed Tumour

DISEASES OF THE LACRIMAL SAC:

a) Dacryocystitis: Inflammation of lacrimal sac.

Types: i) Infantile dacryocystitis

ii) Adult dacryocystitis: Acute, Chronic

The Author

Dr. Sujon Paul

The author of this post is Dr. Sujon Paul, an MBBS Doctor. He is also a blogger and updates this website [HITBANGLA.COM] regularly with fresh contents. Thank you for visiting this website. Contact Author: Facebook, Twitter & Google Plus

2 Comments

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  1. Thanks for the post. Really informative.

  2. Good information. Thanks.

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