Auditory Pathways Part 1 Flashcards
Where are the cell body of the primary afferent CN VIII cochlear part?
Spiral ganglion
Primary afferent CN VIII cochlear part enters the brainstem at?
Pontomedullary junction
Once Primary afferent CN VIII cochlear part enter the brainstem what do they divide as?
Ascending and descending bundles
Where do the ascending primary afferent CN VIII cochlear bundles synapse?
Anterior subdivisions of ventral Cochlear nucleus
Where do the descending primary afferent CN VIII cochlear bundles synapse?
1) Posterior subdivisions of ventral cochlear nucleus
2) Dorsal cochlear nucleus
What is monaural information?
Information about sounds at a single ear
Where is monaural info routed?
Contralateral side
For Monaural Tracts:
1) Where does the cell bodies start?
2) Where do the cell bodies travel first?
3) Where do they go ascend?
4) Where do they synapse from here?
5) Where do cell bodies travel next?
6) Where do they synapse from here?
7) Where do the cell bodies travel next?
8) Where do they synapse from here?
1) Dorsal cochlear nucleus
2) Cross to the contralateral side via dorsal acoustic stria
3) Ascend in the lateral lemniscus
4) Synapse in inferior colliculus
5) Brachium of inferior colliculus
6) Synapse at medial geniculate nucleus
7) Sublenticular limb of internal capsule
8) Layer IV of primary auditory cortex (Anterior temporal transverse gyrus AKA Heschl’s gyrus)
What is Binaural information?
Info about differences between sounds at both ears (compare and localize where sounds are coming from)
For Binaural Tracts:
1) Where does the cell bodies start?
2) Where do the cell bodies travel first?
3) Where do they go ascend?
4) Where do they synapse from here?
5) Where do cell bodies travel next?
6) Where do they synapse from here?
7) Where do the cell bodies travel next?
8) Where do they synapse from here?
1) Ventral cochlear nucleus
2) Project bilaterally through trapezoid body to superior olivary complex (medial and lateral superior olivary nuclei)
3) Ascend in the lateral lemniscus
4) Synapse in inferior colliculus
5) Brachium of inferior colliculus
6) Synapse at medial geniculate nucleus
7) Sublenticular limb of internal capsule
8) Layer IV of primary auditory cortex (Anterior temporal transverse gyrus AKA Heschl’s gyrus)
Deficit related to an obstructed, or altered, transformation of sound to the tympanic membrane or through the ossicle chain is what type of deafness?
Example?
1) Conduction deafness
2) Excessive earwax buildup or middle ear infection and tympanic membrane ruptured
Damage to the cochlea, the cochlear part of CN VIII or to the cochlear nuclei is what type of deafness?
Is the deafness ipsilateral or contralateral?
1) Sensorineural (nerve) deafness
2) Ipsilateral
Damage to the central pathways results in what?
Example?
1) Central deafness which is actually not deafness but trouble localizing where sound is coming from
2) Following conversation in noisy area
What is the origin of blood supply to the cochlea and the auditory nuclei of the pons and medulla?
Basilar artery
What supplies the inner ear and the cochlear nuclei?
What is it a branch of?
1) Internal auditory (labyrinthine) artery
2) AICA
