tegmen

(redirected from tegmen tympani)
Also found in: Dictionary, Medical.

tegmen

[′teg·mən]
(biology)
An integument or covering.
(botany)
The inner layer of a seed coat.
(invertebrate zoology)
A thickened forewing of Orthoptera, Coleoptera, and certain other insects.
Mentioned in ?
References in periodicals archive ?
Bony erosions of middle ear walls with integrity of the Scutum, Ossicular chain, Tegmen tympani, facial nerve canal and labyrinth.
Small defects in the tegmen tympani have been seen in as many as 20% of autopsy cases.
Tegmen tympani, jugular foramen as well as condylar fossa and lateral semi-circular wall dehiscence were noted.
OPERATIVE FINDINGS: Mastoid cavity with clear air cells, CSF leak was identified from two sites, first site in the tegmen tympani in the roof of the antrum, the second leak from the posterio--inferior wall of mastoid cavity below the sigmoid sinus, both the defects were closed with double layered cartilage graft, supported by free muscle graft, temporalis fascia and gelfoam, mastoid cavity filled with medicated pack wound was closed in layers, ASD done post op CSF leak was completely stopped, patient is under follow up at the time of presenting this paper.
4) Temporal lobe abscesses usually involve a defect in the tegmen tympani, (4) as occurred in our patient.
Biochemical analysis of the fluid with beta-2-transferrin identified the fluid as CSE High-resolution computed tomography (CT) of the temporal bone demonstrated an extensively pneumatized but opaque mastoid and a defect in the tegmen tympani (figure).
Unlike a mastoid defect, a tegmen defect cannot be easily obliterated with bone wax because the tegmen tympani is not supported by underlying bone, and the pressure required to apply the wax can fracture it.
In light of the left temporal bone fracture and CSF otorrhea, we presumed that the entry point for the air into the cranial cavity was the mastoid bone, probably through defects in the tegmen tympani and dura.
Occasionally, an EACC extends into the middle ear cavity, facial nerve canal, mastoid cavity, or tegmen tympani.
Destruction of the bone of the glenoid fossa of the temporomandibular joint and tegmen tympani was evident.
In conclusion, spontaneous CSF leakage can occur as a result of bony defects over the tegmen tympani or tegmen mastoideum.
5) In the middle ear or mastoid portion of the temporal bone, an intracranial meningioma can extend along the path of least resistance through a tegmen tympani to dehiscence, the sulci of the greater and lesser superficial petrosal nerves, the sigmoid sinus plate, the geniculate ganglion area, the internal auditory canal, the lateral semicircular canal, and the perilabyrinthine cell tracts or jugular foramen.