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Biomedical subjects

D Djerić

Publications and source records attributed to D Djerić.

At least 55 records · Page 3Linked to original sources
PubMedDate not supplied

Anatomical variations and relations of the bony portion of the eustachian tube.

The bony portion of the Eustachian tube was examined, using anatomical and histological methods, on 200 temporal bones of adults. This part of the tube averages 11.38 mm in length, its tympanic opening has an average diameter of 5.20 X 3.95 mm, and its lumen can be of an irregular (45%), rectangular (35%) or triangular (20%) shape. The dimensions of the bony portion of the tube diminish gradually toward the isthmus, so that in the middle the average diameter is 4.02 X 3 mm and at the level of the isthmus, 2.5 X 1.5 mm. The outer wall forms the tympanic plate of the tympanic bone, which in 65% of the cases is compact and in 35% finely pneumatized. On this wall bony trabeculae often appear, which more or less block the lumen of the tube. The medial part of the upper wall forms the bony septum toward the m. tensor tympani and the lateral represents the tegmen. The average distance from the lumen of the tube to the dura at the level of the tegmen is 3.62 mm. The tegmen above the tube may be pneumatized (45%) or compact (55%). The lower wall in 20% of the cases is represented by a shallow groove, and if formed is usually convex into the tube's lumen, but is less often concave. The jutting out of the lower wall is usually caused by its pneumatization.

Adult↗
PubMedDate not supplied

Anatomical variations and relations in the medial wall of the bony portion of the eustachian tube.

The medial wall of the bony portion of the Eustachian tube was examined, by anatomical and histological methods, in 150 temporal bones of adults. This wall consists of two parts: posterolateral (labyrinthine) and anteromedial (carotid), whose shapes, sizes and relations depend upon the position of the a. carotis interna. If it is located nearer the tympanic opening of the tube, the labyrinthine part of the wall is smaller and has a triangular shape. The further the artery is removed from the tympanic opening of the tube, the greater and more rectangular the shape of this part of the wall. The part of the medial wall which corresponds to the a. carotis interna can differ in each case and in 69% of the cases this part extended more or less into the lumen of the tube. The average thickness of this part of the wall is 1.5 mm (minimum is wafer-thin and maximum is 3 mm). In 2% of the cases the bony wall above the a. carotis interna was missing, so that the artery projected into the protympanum. Through a bone defect, aneurysm of the artery can develop. In one case, during an operation, it was established that the protrusion of the a. carotis interna into the tympanic cavity was due to a defect in the medial wall of the Eustachian tube.

Adult↗
PubMedDate not supplied

X-ray diffraction analysis of the auditory ossicles in chronic otitis.

An X-ray diffraction analysis was carried out on 10 healthy mallei and incudes which were taken from cadavers and on 50 diseased mallei and incudes taken peroperatively from patients with atticoantral otitis. X-ray powder diagrams of normal ossicles were shown as a granular hydroxyapatite. In diseased ossicles, changes were found in the crystallinity of hydroxyapatite which can be divided into four groups: (i) with characteristics of a diagram of normal bones giving peaks of maximum intensity of a granular hydroxyapatite; (ii) with less hydroxyapatite crystallinity; (iii) characterized by the occurrence of an amorphous phase of bone; (iv) characterized by the absence of all types of crystallization. The occurrence of different phases of crystalline hydroxyapatite in various forms of atticoantral otitis does not depend on the type of pathological process, i.e., with or without cholesteatoma.

Adult↗
PubMedDate not supplied

[Complications of stapedectomy involving the middle ear structures].

On the basis of personal experience and data from literature, the authors enumerate possible complications of the middle-ear structures during stapedectomy: perforation of the eardrum, disturbed function of the chorda tympani, peripheric paralysis of the facial nerve, incus luxation, haematotympanon, inflammatory complications, late improvement of the hearing, reoperative granuloma, cholesteatoma and sudden damage of the hearing.

Ear, Middle↗
PubMedDate not supplied

[Indications for surgical treatment of fractures of the pyramid of the temporal bone].

On the basis of data from literature and personal experience, the authors precise indications for surgery of the fractured temporal bone. They suggest that after appeasement of neurosurgical phase of the disease operation should only be carried out if peripheric paralysis of the facial nerve, conductive deafness and otoliquorrheoa, are evident. In addition to these indications they also suggest operation in patients with chronic otitis due to injury or if this process preceded the injury.

Humans↗
PubMedDate not supplied

[Intra-temporal bone paralysis of the facial nerve].

On the basis of personal experience and data from literature, the authors enumerate causes of peripheric paralysis of the facial nerve due to diseases and injuries of the temporal bone. They made the aetiological classification of these paralyses and described some pathophysiological mechanisms of their onset.

Cholesteatoma↗