| lacuna cerebri | A small circumscribed loss of brain tissue caused by occlusion of one of the small penetrating arteries. Synonym: lacuna cerebri. (05 Mar 2000) |
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| lacuna magna | A recess on the roof of the fossa navicularis of the penis, formed by a fold of mucous membrane, the valve of the navicular fossa. (05 Mar 2000) |
| lacuna musculorum | The lateral compartment beneath the inguinal (Poupart's) ligament, for the passage of the iliopsoas muscle and femoral nerve; it is separated by the iliopectineal arch from the vascular lacuna. Synonym: lacuna musculorum. (05 Mar 2000) |
| lacuna pharyngis | A depression near the pharyngeal opening of the auditory (eustachian) tube. (05 Mar 2000) |
| lacuna urethralis | One of a number of little recesses in the mucous membrane of the spongy urethra into which empty the ducts of the urethral glands. Synonym: lacuna urethralis, Morgagni's lacuna. (05 Mar 2000) |