Gyri temporales transversi
The gyri temporales transversi ( Brodmann area 41; also called Heschl's transverse turns after Richard Heschl ) in their entirety form the primary auditory cortex (also known as the primary auditory center ). They become macroscopically visible by removing the pars opercularis of the inferior frontal gyrus .
The primary auditory cortex receives its afferents from the auditory radiation ( radiatio acustica ) from the corpus geniculatum mediale (part of the metathalamus ). Hearing radiation and corpus geniculatum mediale are the terminal parts of the auditory pathway . The auditory pathway fibers from the corpus geniculatum mediale end in the primary auditory cortex in a tonotopic arrangement, which means that the representations of different sound frequencies occupy very specific areas in the auditory cortex .
Noises are not yet interpreted in the primary auditory cortex ; rather, noises are consciously perceived here. The sensible combination of sounds and their interpretation place after connection of the secondary auditory cortex instead.
Damage to the primary auditory cortex usually does not lead to complete deafness , but to hearing impairment , since both primary auditory cortexes receive afferents from both ears through partial crossing of the nerve fibers . However, directional hearing is then severely restricted.
literature
- Trepel, Martin: Neuroanatomy. Structure and function. 3rd edition, Munich / Jena 2004, ISBN 3-437-41297-3
- Wurzinger, Laurenz a. a .: Dual series anatomy. 1st edition, Thieme Stuttgart, 2007, ISBN 3-13-136041-0