ANATOMICAL LOCUS OF THE ANGULAR GYRUS: PRELIMINARY FINDINGS
Journal Title: Journal of Hearing Science - Year 2016, Vol 6, Issue 2
Abstract
Background: The angular gyrus (AG) is an association area of the human cerebral cortex that plays a role in several processes, including auditory function. However, the precise anatomical location of the AG is not entirely clear. There are two common approaches for locating the AG based on gyral and sulcal landmarks: the ‘parallel’ and ‘count-back’ methods (as termed by the present authors). These two techniques do not always point to the same location on the cortex, thus making the macroanatomical locus of the AG rather ambiguous. Materials and methods: Twenty high-resolution brain MRIs of normal, right-handed human subjects chosen from an online database (OASIS). MRIs were sequentially chosen from OASIS and analyzed in MRIcron using two different visualization techniques: 1) skull-stripped surface renderings, and 2) serial sagittal slices. The AG was demarcated in the left and right hemisphere of each brain, as defined by the parallel and count-back methods. The reliability of each method for locating the AG was systematically assessed using both descriptive and inferential statistics, based on measures of hemispheric laterality. Results: Examination of both methods for locating the AG showed poorer reliability in the left hemisphere compared to the right for both surface and more medial sites. Several anatomical factors were identified that compromised the reliability of the two methods. Conclusions: Our finding of poor reliability between the parallel and count-back methods suggests that the AG is sometimes difficult to identify, particularly in the left hemisphere. This places the traditional gross anatomical methods for locating the AG in question. Development of new techniques to define this area of human neuroanatomy is needed.
Authors and Affiliations
Alyssa Everett, Barrett St. George, Nicole Denny, Frank Musiek
Keywords
Related Articles
- EP ID EP370067
- DOI 10.17430/898760
- Views 54
- Downloads 0
USE OF THE VIBRANT SOUNDBRIDGE MIDDLE EAR IMPLANT WITH SHORT PROCESS INCUS COUPLER FOR CHRONIC OBSTRUCTIVE INFLAMMATION OF THE EXTERNAL EAR CANAL: CASE STUDY
Background: The chronic obstructive inflammation of an external ear canal after different kinds of surgeries often leads to restenosis. There are different approaches to treatment of such cases; one of the solutions are...
HEARING LOSS AND VERY LOW BIRTHWEIGHT
Background: Regardless of gestational age, any newborn (NB) with a weight at birth of <1500 g is considered to be of very low birth weight (VLBW). The incidence of hearing loss in this population group is 5–6% but the fr...
SUDDEN SENSORINEURAL HEARING LOSS IN CHILDREN: A LITERATURE REVIEW
Many issues concerning sudden sensorineural hearing loss (SSNHL) remain unresolved. An especially troublesome and uncharted field is SSNHL in children. The aim of the present literature review was to recognize, criticall...
ATROPHY OF THE LONG CRUS OF INCUS OF UNCLEAR ETIOLOGY: CASE REPORT
Background: Study presents the case of a 27-year-old man admitted to our clinic with unilateral stable hearing loss in the right ear which had been present for about 10 years. Patient’s medical history did not suggest in...
A FAST, “ZERO SYNAPSE” ACOUSTIC REFLEX: MIDDLE EAR MUSCLES PHYSICALLY SENSE EARDRUM VIBRATION
The middle ear muscles may be inconspicuous, but they are special. Silently standing guard at the entrance to the inner ear, their role is to spring into action whenever sound input rises, protecting the highly sensitive...