What's the difference between pessulus and syrinx?
Pessulus
Definition:
(n.) A delicate bar of cartilage connecting the dorsal and ventral extremities of the first pair of bronchial cartilages in the syrinx of birds.
Example Sentences:
(1) While at level of the proximal and distal third of the tympanic membrane the morphological and structural aspects of the cells resemble that of the adjacent structures (pessulus and primary bronchi), the middle part of the epithelium layer becomes gradually flattered; the epithelium is made up of oblique or horizontal cells which touch each other by means of many lateral interdigitations.
(2) M. sternotrachealis relaxes the membranes by drawing the drum of the trachea caudad, or, via the syringeal ligament, by rotating the pessulus cranioventrad, or both.
Syrinx
Definition:
(n.) A wind instrument made of reeds tied together; -- called also pandean pipes.
(n.) The lower larynx in birds.
Example Sentences:
(1) With regard to the pathogenesis of syringomyelia, we concluded that in cases associated with Chiari II malformation, vermian protrusion and direct continuity between the fourth ventricle and the syrinx were essential.
(2) Three cases of post-traumatic syringomyelia are presented and the mechanism of syrinx formation is discussed.
(3) It is felt that these abnormal areas of spinal cord are responsible for the presenting symptomatology and may be precursors of syrinxes.
(4) A review of 15 patients with posttraumatic syringomyelia indicates that the most reliable electrodiagnostic criteria for the diagnosis of syrinx are the loss of motor unit numbers with increase in motor unit amplitude and duration nd synchronous firing.
(5) Repeat MRI revealed the syrinx to be smaller in diameter.
(6) The return of the symptoms correlated with the re-expansion of the syrinx on MRI.
(7) Furthermore, the results disclosed that the clinical symptoms, the degree of disability and the duration of the disease are not related to the dimensions of the syrinx or the electrophysiological results obtained by investigating the long ascending and descending spinal tracts of the lower limbs.
(8) Clinical manifestations are determined mainly by the level of vascular malformation and are not reflective of the level of syrinx.
(9) The disappearance of the syrinx on postoperative MRI correlated well with a good surgical outcome.
(10) Drainage of the syrinx delayed but did not prevent curve progression in immature patients, but did allow use of distraction instrumentation without complication for operative management of the associated scoliosis.
(11) Radiological investigation revealed a large cervicothoracolumbar syrinx of no known cause.
(12) Of the 25 patients who presented with spinal symptoms, 23 (92%) proved to have a syrinx at MR imaging.
(13) Postoperative NMR monitoring represents an effective non-invasive neuroradiological procedure that allows follow-up of syrinx evolution over the years.
(14) The size of the syrinx visualised by MR did not correlate with the clinical status during the follow-up studies.
(15) MRI demonstrated a syrinx extending from the medulla to the entire cervical cord.
(16) There was symptomatic improvement and collapse of the syrinx in each case, with no complications or recurrences over a follow-up interval of 14 to 27 months (average 20.3 months).
(17) The syrinx within the thoracic cord reduced in size after two months and disappeared after three months.
(18) Delayed metrizamide computed tomography myelography was decisive for making the diagnosis of a highly extended syrinx associated with the tumor.
(19) The caudal portion of the hypoglossal nucleus (nXIIts) contains the motor neurons that control the syrinx in songbirds.
(20) Computed tomography and magnetic resonance images (MRI) showed an expansive syrinx with adhesive arachnoiditis in the thoracic levels below the injury site and a localized syrinx on the posterolateral gray matter in the cervical levels above the injury site.