Final answer:
Sound enters the external ear through the auditory canal, directed by the auricle (pinna), and is transferred to the tympanic membrane. This process eventually leads to the transduction of sound waves into neural signals within the cochlea of the inner ear.
Step-by-step explanation:
The GB channel likely refers to a structure associated with hearing within the ear that a student might have intended to inquire about. According to our understanding of auditory anatomy, sound enters the external ear through the auditory canal, which is directed by the auricle, commonly known as the pinna. The auditory canal passes sound waves toward the tympanic membrane, or eardrum, via the external auditory meatus of the temporal bone.
This results in the vibration of the tympanic membrane, an important step in the process of converting sound waves into neural signals. The small bones in the middle ear known as ossicles, which include the malleus, incus, and stapes, amplify and transfer these sound vibrations from the tympanic membrane to the cochlea of the inner ear, where hair cells, or stereocilia, transduce the vibrations into electrical nerve impulses.