Publications by authors named "R Perez-Sanz"
Cement based materials may contain varying levels of radionuclides, mainly Ra (from the U series), Th and K, which are used to determine the Activity Concentration Index ("ACI"). According to the European directive Euratom 2013/59 in these materials, the "ACI" must be < 1 to be suitable for their use in construction. In this paper, data on the activity concentration of natural radionuclides in cement-based materials (i.
View Article and Find Full Text PDF[Ontogenic development of the incudostapedial joint].
Acta Otorrinolaringol Esp
October 2008
Article Synopsis
- The study focuses on the development of the incudostapedial joint in human embryos and fetuses.
- The findings reveal that the joint resembles a spheroidal joint by 16 weeks of development, with distinct layers of cartilage forming at various stages up to 34 weeks.
- By birth, the incudostapedial joint is fully developed, including its articular capsule and synovial membrane.
Objective: To investigate the presence of connections between the bone marrow of the ossicles and the mesenchyme that fills the future tympanic cavity.
Material And Methods: Ninety temporal bones from embryos and foetuses were examined, selecting 15 aged between 20th to 30th weeks of development, to show connections between ossicle marrow and mesenchyme.
Results: The connections are transitory and appear in the malleus and the incus between 20th to 24th weeks of development, while in the stapes appear later, being between 24th to 28th weeks.