lacuna

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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.

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]

lacuna

/la·cu·na/ (lah-ku´nah) pl. lacu´nae   [L.]
1. a small pit or hollow cavity.
2. a defect or gap, as in the field of vision (scotoma).lacu´nar

absorption lacuna  resorption l.
bone lacuna  a small cavity within the bone matrix, containing an osteocyte; from it 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 l.
intervillous lacuna  one of the blood spaces of the placenta in which the fetal villi are found.
lateral lacunae  venous meshworks within the dura mater on either side of the superior sagittal sinus.
osseous lacuna  bone l.
lacuna pharyn´gis  a depression at the pharyngeal end of the eustachian tube.
resorption lacuna  a pit or groove in developing bone that is undergoing resorption; frequently found to contain osteoclasts.
trophoblastic lacuna  intervillous l.

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.

lacuna

[ləkyo̅o̅′nə] pl. lacunae
Etymology: L, pit
1 a hollow within a structure, especially bony tissue, in which lie osteoblasts.
2 a gap, as in the field of vision.
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

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.

lacuna

Any empty space, missing part, cavity or depression.

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.

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.

lacuna (ləkoo´nə),

n a term used in anatomic nomenclature to designate a small hollow cavity or pit.
lacuna, absorption (Howship's lacuna),
n an area (pit) of bone resorption, usually irregular in outline, and often containing osteoclasts.
lacuna, osteocyte,
n a hollow cavity within bone, containing osteocytes, from which canaliculi, containing protoplasmic processes of the osteocytes, radiate.

lacuna

pl. lacunae [L.]
1. a small pit or hollow cavity.
2. a defect or gap, as in the field of vision (scotoma).

absorption lacuna
a pit or groove in developing bone that is undergoing resorption; frequently found to contain osteoclasts.
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
the concave cavities which are formed by osteoclasts in the process of bone resorption.
osseous lacuna
bone lacuna (see above).
osteocytic lacuna
see bone lacuna (above).
urethral lacuna
numerous small depressions or pits in the mucous membrane of the urethra.
vascular lacuna
a breach in any membrane or other tissue which is navigated by blood vessels.