LACUNA

(Lat.), n. f. La2k(la3k)-u2(u)'na3. Dim. of lac us, a lake. Fr., lacune. Ger., Grube, Griibclien. 1. A small crypt, cavity, depre ion, or solution of continuity. 2. In embryology, a space formed between the vitellus and the vitelline membrane by the shrinkage of the former consequent on the extrusion of the polar globules from the germinal vesicle. 3. In botany, a pit or depre ion on the surface of a plant-organ, also an air-space within a plant, especially when about as large as the surrounding cells [B, 1, 19, 229, 291 (a, 35).] 4. Of Falloppius, the anterior fontanelle. [L, 349.] Absorption lacunae. See How ship^s lacunae. Air lacuna;. See yh'r-LAGUNULES. Bone-lacunae. L .,sacculi chal cop hori, lacunae, o ium. Fr., corpuscules o eux. Ger., Knochenhohlen (oder -korperchen). The isolated ovoid spaces situated mostly between the o eous lamellae, and connected with one another by canaliculi. Each 1. contains, during life, a protoplasmic body or bone cell. [J, 24., 30, 31, 35. J Cf. -Sone-coRPUSCLES (1st def.). Cartilage lacunae. See Cartilage-CAvniES. Havers i an lacunae. The lacunas between the Havers i an lamella?. How ship's lacunae. Ger., How ship's che Lacunen (oder Griibchen). Syn.: absorption lacunae. 1. See FOVEOI^B howshipiancc. 2. The absorption pits at the surface of bone next the periosteum. 3. Rece es or excavations in bone filled with granulation ti ue, the result of caries. [E; J, 32, 42.] Inter villous lacunae (of the placenta). Fr., espaces sanguins maternels. Syn.: placental blood spaces. The sinuses of the maternal portion of the placenta in which the foetal placental villi hang free. [A, 5.] L. amatorum. See L. labii superior is. L. extern a vasorum crural i uni. The saphenous opening. [L. 31.] Lacunae Graafianae. Graafian follicles. [L.] L. labii snperioris. Ger., Liebrsgriibchen. The vertical median groove of the upper lip. [A, 322.] Lacunas lateU2, blue; U3, lull; U4, full; U6, urn; U, like u (German). [s. 567]