Lacuna

(la-ku'-nah) A little hollow space. A mucous or lymphatic follicle. L., Absorption. See How ship's Lacuna. L. amatorum, the vertical groove in the center of the upper lip. L. Bone. See Bone . L. of Cementum, spaces in the cement of the teeth analogous to those in bone. L. cerebri, the infundibulum of the brain. L. of Cornea, spaces between the laminae of the cornea. L. graafianae, Graafian follicles. L., Havers i an. See Bone . L., How ship's. I. Depre ions on the surface of bone beneath the periosteum. 2. Carious excavations in bone filled with granulation-ti ue. L., Inter villous (of placenta), the spaces in the maternal portion of the placenta filled with blood, and in which the fetal villi hang. L. labii superior is. See L. amatorum. L. later a les sinus superior is, depre ions along the groove of the superior longitudinal sinus. L. magna, the largest of the orifices of the glands of Littre, situated on the upper surface of the fo a navicular is. L. morgagni, the orifices of the glands of Littre, or the glands themselves. L. pharyngis, a depre ion at the opening of the Eustachian tube into the pharynx. L. of Tongue, the foramen cecum. See Foramina, Table of. L. of Urethra, follicular depre ions in the mucous membrane of the urethra, most abundant along the floor, especially in the region of the bulb. Their mouths are directed forward.