ridge (rij)

1. A (usually rough) linear elevation. See also crest. 2. In dentistry, any linear elevation on the surface of a tooth. 3. The remainder of the alveolar process and its soft tissue covering after the teeth are removed. [A. S. hyrcg, back, spine]
alveolar r. alveolar process
apical ectodermal r. the layer of surface ectodermal cells at the apex of the embryonic limb bud; considered to exert an inductive influence on the condensation of underlying mesenchyme.
basal r. 1. alveolar process 2. cingulum of tooth
bicipital r.'s crest of greater tubercle, crest of lesser tubercle
buccocervical r. a convexity within the cervical third of the buccal surface of molars.
buccogingival r. a distinct r. on the buccal surface of a deciduous molar tooth, approximately 1.5 mm from the crown-root junction.
bulbar r. one of two spiral subendocardial thickenings in the embryonic bulbus cordis; when they fuse, they divide the bulbus into the aorta and pulmonary artery.
bulboventricular r. an elevation on the inner surface of the embryonic heart at four to five weeks; it indicates the division between the developing ventricles and the bulbus cordis.
dental r. the prominent border of a cusp or margin of a tooth.
epidermal r.'s ridges of the epidermis of the palms and soles, where the sweat pores open.cristae cutis [NA], skin r.'s;
epipericardial r. an elevation separating the developing pharyngeal region from the embryonic pericardium.
external oblique r. a horizontal bony crest on the external surface of the body of the mandible, inferior to the alveolar bone, marking the site of attachment of the buccinator muscle.
ganglion r. neural crest
genital r. gonadal r
gluteal r. gluteal tuberosity
gonadal r. an elevation of thickened mesothelium and underlying mesenchyme on the ventromedial border of the embryonic mesonephros; the primordial germ cells become embedded in it, establishing it as the primordium of the testis or ovary.genital r;
interpapillary r.'s rete r.'s
key r. zygomaxillare
lateral epicondylar r. lateral supracondylar r
lateral supracondylar r. the distal sharp portion of the lateral margin of the humerus.crista supracondylaris lateralis [NA], lateral epicondylar crest, lateral epicondylar r., lateral supracondylar crest;
linguocervical r. linguogingival r
linguogingival r. a r. occurring on the lingual surface, near the cervix, of the incisor and cuspid teeth.linguocervical r;
Mall's r.'s rarely used eponym for pulmonary r.'s.
mammary r. bandlike thickening of ectoderm in the embryo extending on either side from just below the axilla to the inguinal region; in human embryos, the mammary glands arise from primordia in the thoracic part of the r., the balance of the r. disappearing; in some lower mammals which give birth to a litter of young, several milk glands develop along these lines.mammary fold, milk line, milk r;
marginal r. marginal crest
medial epicondylar r. medial supracondylar r
medial supracondylar r. the distal sharp portion of the medial margin of the humerus.crista supracondylaris medialis [NA], medial epicondylar crest, medial epicondylar r., medial supracondylar crest;
mesonephric r. a r. which, in early human embryos, comprises the entire urogenital r.; however, later in development a more medial genital r., the potential gonad, is demarcated from it. See also urogenital r.mesonephric fold;
milk r. mammary r
mylohyoid r. mylohyoid line
nasal r. agger nasi
oblique r. a r. on the masticatory surface of an upper molar tooth from the mesiolingual to the distobuccal cusp.
oblique r. of trapezium tubercle of trapezium
palatine r. palatine raphe
Passavant's r. Passavant's cushion
pectoral r. crest of greater tubercle
pharyngeal r. palatopharyngeal sphincter
primitive r. one of the paired r.'s on either side of the primitive groove.
pronator r. an oblique r. on the anterior surface of the ulna, giving attachment to the pronator quadratus muscle.
pterygoid r. of sphenoid bone infratemporal crest
pulmonary r.'s a pair of r.'s overlying the common cardinal veins and bulging from the lateral body wall into the embryonic celom; so called because they give early indication of where the pleuropericardial folds will develop.
residual r. that portion of the processus alveolaris remaining in the edentulous mouth following resorption of the section containing the alveoli.
rete r.'s downward thickening of the epidermis between the dermal papillae; peg is a misnomer because the dermal papillae are cylindrical but the epidermal thickening between papillae is not.interpapillary r.'s, rete pegs;
skin r.'s epidermal r.'s
sphenoidal r.'s sharp posterior margins of the lesser wings of the sphenoid bone which end medially in the anterior clinoid process; the sphenoidal r.'s demarcate the anterior cranial fossa from the lateral part of the middle cranial fossa.
superciliary r. superciliary arch
supplemental r. a r. on the surface of a tooth that is not normally present.
supraorbital r. supraorbital margin
taste r. one of the r.'s surrounding the vallate papillae of the tongue.
temporal r. inferior temporal line, superior temporal line
transverse r. crista transversalis
transverse palatine r. transverse palatine fold
trapezoid r. trapezoid line
triangular r. crista triangularis
urogenital r. one of the paired longitudinal r.'s developing in the dorsal body wall of the embryo on either side of the dorsal mesentery; the r. is formed at first by the growing mesonephros and later by the mesonephros and the gonad.genital fold, wolffian r;
wolffian r. urogenital r


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