| crural arch | <anatomy> A fibrous band formed by the thickened inferior border of the aponeurosis of the external oblique that extends from the anterior superior spine of the ilium to the pubic tubercle bridging, muscular and vascular lacunae;forms the floor of the inguinal canal; gives origin to the lowermost fibres of internal oblique and transversus abdominis muscles. See: aponeurosis of external abdominal oblique muscle. Synonym: ligamentum inguinale, arcus inguinalis, crural arch, fallopian arch, fallopian ligament, femoral arch, Poupart's ligament. (05 Mar 2000) |
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| pubic arch | The arch formed by the symphysis, bodies and inferior rami of the pubic bones. See: subpubic angle. Synonym: arcus pubis. (05 Mar 2000) |
| hyoid arch | <anatomy> The second visceral, or branchial, a; the second postoral arch in the branchial arch series. (05 Mar 2000) |
| nasal arch | Bridge of the nose, the upward arching roof of the piriform aperture formed by the nasal processes of the maxilla of each side and the nasal bones between them. Eyeglasses rest centrally on various portions of this arch. (05 Mar 2000) |
| neural arch | The posterior projection from the body of a vertebra that encloses the vertebral foramen; it consists of paired pedicles and laminae; the spinous, transverse, and articular processes arise from the arch. In aggregate, the venous arches-and the ligamenta flava that unite them-form the posterior wall of the vertebral (spinal) canal. Synonym: arcus vertebrae, neural arch. (05 Mar 2000) |
| superciliary arch | A fullness extending laterally from the glabella on either side, above the orbital margin of the frontal bone. Synonym: arcus superciliaris, superciliary ridge. (05 Mar 2000) |
| superior dental arch | The teeth supported by the alveolar process of the two maxillae, whether the 10 deciduous teeth or the 16 permanent teeth. Synonym: arcus dentalis superior, maxillary dentition. (05 Mar 2000) |
| supraorbital arch | The superior half of the orbital rim, which constitutes the curved superior border of the orbital opening, formed by the frontal bone. See: orbital rim. Synonym: margo supraorbitalis, supraorbital arch, supraorbital ridge. (05 Mar 2000) |
| dental arch | <anatomy, dentistry> The curved composite structure of the natural dentition and the residual ridge, or the remains thereof after the loss of some or all of the natural teeth. (05 Mar 2000) |
| double aortic arch | Congenital malformation of the aorta that splits and has a right and a left arch instead of a single arch. (05 Mar 2000) |
| iliopectineal arch | A thickened band of fused iliac and psoas fascia passing from the posterior aspect of the inguinal ligament anteriorly across the front of the femoral nerve to attach to the iliopectineal eminence of the hip bone posteriorly. The iliopectinal arch thus forms a septum which subdivides the space deep to the inguinal ligament into a lateral muscular lacunae and a medial vascular lacunae. When a psoas minor muscle is present, its tendon of insertion blends with the iliopectineal arch. Synonym: arcus iliopectineus, iliopectineal ligament, ligamentum iliopectineale. (05 Mar 2000) |
| inferior dental arch | The teeth supported by the alveolar part of the mandible, whether the 10 deciduous teeth or the 16 permanent teeth. Synonym: arcus dentalis inferior, mandibular dentition. (05 Mar 2000) |
| tarsal arch | See: arterial arch of lower eyelid, arterial arch of upper eyelid. (05 Mar 2000) |
| tendinous arch | A white, fibrous band attached to bone and/or muscle, arching over and thus protecting neurovascular elements passing beneath it from injurious compression, a linear thickening of the deep fascia of a muscle which provides attachment for ligaments and/or muscle fibres. Synonym: arcus tendineus. (05 Mar 2000) |
| tendinous arch of levator ani muscle | <anatomy> A thickened portion of the obturator fascia that extends in an arching line from the pubis posteriorly to the ischial spine and gives origin to part of the levator ani muscle. Synonym: arcus tendineus musculi levatoris ani, arcus tendineus of obturator fascia. (05 Mar 2000) |