Lacunae of Morgagni, also called the urethral

Urethra

In anatomy, the urethra is a tube that connects the urinary bladder to the genitals for the removal of fluids out of the body. In males, the urethra travels through the penis, and carries semen as well as urine...

 lacunae of the male urethra (lacunae urethralis, urethrae masculinae or the crypts of Morgagni), are small depressions or recesses on the surface of the mucous membrane of the urethra. Their openings are usually directed distally. The largest of these recesses is called lacuna magna

Lacuna magna

In male anatomy, the lacuna magna is the largest of several recesses in the roof of the navicular fossa of the urethra. Its embryologic origin is contested, but recent evidence suggests it and the navicular fossa derive from infiltrating endodermal cells of the urethral plate...

 or the sinus of Guérin, which is situated on the upper surface of the fossa navicularis

Navicular fossa of male urethra

The cavernous portion of the urethra is narrow, and of uniform size in the body of the penis, measuring about 6 mm in diameter; it is dilated behind, within the bulb, and again anteriorly within the glans penis, where it forms the fossa navicularis urethræ....

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Located deeper within the lacunae are branching mucous tubule

Tubule

A tubule is a very small tube or fistular structure.A system of surface-connected membranes in muscle that enables a nerve impulse to travel to the interior of the muscle fibre.In anatomy, a tubule is a minute tube lined with glandular epithelium....

s called the glands of Littre

Urethral gland

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. The lacunae of Morgagni are named after Italian anatomist Giovanni Battista Morgagni

Giovanni Battista Morgagni

Giovanni Battista Morgagni was an Italian anatomist, celebrated as the father of modern anatomical pathology.-Education:...

(1682-1771).