lacuna

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Related to lacunal: lacunar, cicerone

lacuna

 [lah-ku´nah] (L.)
1. a small pit or hollow cavity.
2. a defect or gap, as in the field of vision (scotoma). adj., adj lacu´nar.
absorption lacuna resorption lacuna.
bone lacuna a small cavity within the bone matrix, containing an osteocyte, and from which slender canaliculi radiate and penetrate the adjacent lamellae to anastomose with the canaliculi of neighboring lacunae, thus forming a system of cavities interconnected by minute canals.
cartilage lacuna any of the small cavities within the cartilage matrix, containing a chondrocyte.
Howship's lacuna resorption lacuna.
intervillous lacuna one of the spaces of the placenta occupied by maternal blood, into which the fetal villi project.
osseous lacuna bone lacuna.
lacuna pharyn´gis a depression of the pharyngeal end of the eustachian tube.
resorption lacuna a pit or concavity found in bones undergoing resorption, frequently containing osteoclasts. Similar lacunae also may be found in eroding surfaces of cementum.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

la·cu·na

, pl.

la·cu·nae

(lă-kū'nă, -kū'nē),
1. A small space, cavity, or depression.
2. A gap or defect.
3. An abnormal space between strata or between the cellular elements of the epidermis.
4. Synonym(s): corneal space
[L. a pit, dim. of lacus, a hollow, a lake]
Farlex Partner Medical Dictionary © Farlex 2012

lacuna

(lə-kyo͞o′nə, -ko͞o′-)
n. pl. lacu·nae (-nē) or lacu·nas
Anatomy A cavity, space, or depression, especially in a bone, containing cartilage or bone cells.

la·cu′nal adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Histology A small, hollow chamber that houses an osteocyte in mature bone tissue or a chondrocyte in cartilage tissue
Medspeak A small pit, cavity, defect or gap
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

la·cu·na

, pl. lacunae (lă-kū'nă, -nē)
1. [TA] A small space, cavity, or depression.
2. A gap or defect.
3. An abnormal space between strata or between the cellular elements of the epidermis.
4. Synonym(s): corneal space.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

lacuna

Any empty space, missing part, cavity or depression.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

lacuna

a cavity or depression, for example, one of many small spaces between the lamellae of bones that is occupied by individual bone cells. Small canals (canaliculi) radiate from the lacunae and in these are small protoplasmic processes which connect with the osteoblasts in other lacunae. see HAVERSIAN CANAL.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

la·cu·na

, pl. lacunae (lă-kū'nă, -nē)
1. [TA] Small space, cavity, or depression.
2. Gap or defect.
3. Abnormal space between strata or between the cellular elements of the epidermis.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Retention of CAM (Table V) in these neotropical terrestrial Isoetes would be favored by the accumulation of lacunal [CO.sub.2] at night and by the highly cutinized astomatous leaves, which provide diffusive resistance to [CO.sub.2] leakage during daytime deacidification.
The fact that these terrestrial species have retained the conservative lacunal leaf architecture suggests an aquatic ancestry for these species.