Segment

(seg'-ment). I. A small piece cut from the periphery of anything. 2. A natural division, resulting from segmentation; one of a series of homologous parts, as a myotome; the part of a limb between two consecutive joints. A subdivision, ring, lobe, somite, or metamere of any cleft or articulated body. S. of Bandl. See Bandl' s Ring. S., Inter annular, the portion of a nerve included between two consecutive nodes of Ranvier. S., Intermediate (of a cilium), the isotropous, delicately striated portion of a cilium between the cilium proper and its pedicle. S., Lower (of the uterus), all that portion of the uterus situated below the ring of Bandl. Ss., Medullary, the incisures of Schmidt and Lautermann, or oblique markings in the medullary sheath of a nerve-fiber. S., Primitive, Minot's word for a primitive division of the vertebrate celom. The pro to vertebra, mesoblastic of somite, mesomere, L'rsegment, L'rvrirbel, authors. S., Pubic metamere, (of the pelvic floor); this " consists of what extends from the symphysis pubis to the anterior vaginal wall, inclusive of the latter, and is chiefly made up of bladder." (D. B. Hart.) S., Rivinian (of the tympanic ring), that portion of the temporal bone between the two points of attachment of its tympanic portion to its squamous portion. S., Sacral (of the pelvic floor), that portion which " extends from the sacrum to the posterior vaginal wall." (D.B.Hart.) S., Schmidt-Lautermann's, the elongated pieces making up the medullary substmce of nerve-fibers, several pieces being included within each internode. Seiage (sa'-ahzh). In ma age, a pre ing with a to-and-fro movement, similar to the action of a saw. It is practised with the ulnar border of the hand, or the palmar side of the hand. Seidlitz Powder (sed'-litz). Pulvis effervescens compos it us. See Pota ium . Seignette Salt. Pota ium and sodium tartrate, It crystallizes in large prisms with hemihedral faces. See Rochelle Salt .