Laboratory 13 : Tract Systems II
  Auditory Tract

Auditory Tract

It is important to note that:

  • Information from receptor cells in cochlea distributed bilaterally; most goes to contralateral side


Slide 62 : Diencephalon

  • Axons of auditory radiation terminate in primary auditory cortex in the superior temporal gyrus (temporal lobe)

Slide 51 : Midbrain & Diencephalon

  • Axons from BIC synapse in MGN
  • Axons from MGN enter internal capsule as the auditory radiation

Slide 47 : Pons & Midbrain

  • Axons continue rostrally through brachium of caudal colliculus (BIC)
Slide 43 :

  • Axons from LL synapse in caudal colliculus (IC)
  • Axons from IC pass rostrally through BIC toward medial geniculate nucleus (MGN)

Slide 34 : Rostral Medulla

  • SA axons from cochlea enter via CNVIII, go to cochlear nuclei
  • Some fibers decussate in tegmentum, others in trapezoid body
  • Info carried rostrally in lateral lemniscus (LL)

Copyright © 2006 - University of Pennsylvania School of Veterinary Medicine, All rights reserved.
Faculty: Dr. Richard Miselis, Dr. Peter Hand
Students: Natalie Fickel V'12, Ryan Donahue V'09, Cara Catanese V’08, Rebecca Wolf V'06, Keith Javic V'03, Ken Bixel V'99, Russel Howe-Smith V'97