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The ear canal – the auditory canal. Once the sound waves have passed the pinna, they move two to three centimetres into the auditory canal before hitting the eardrum, also known as the tympanic membrane. The function of the ear canal is to transmit sound from the pinna to the eardrum. Hope this helped :)

The purpose Outer Ear

  • It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified. The sound waves then travel toward a flexible, oval membrane at the end of the ear canal called the eardrum, or tympanic membrane.
  • The outer ear, external ear, or Auris externa is the external part of the ear, which consists of the auricle (also pinna) and the ear canal.[1] It gathers sound energy and focuses it on the eardrum

Auricle

  • The visible part is called the auricle, also known as the pinna, especially in other animals. It is composed of a thin plate of yellow elastic cartilage, covered with integument, and connected to the surrounding parts by ligaments and muscles; and to the commencement of the ear canal by fibrous tissue.

Ear canal

  • From the pinna, the sound waves move into the ear canal (also known as the external acoustic meatus) a simple tube running through to the middle ear.

Muscles

Intrinsic muscles

The intrinsic muscles of the external ear are:

  • The helicis major is a narrow vertical band situated upon the anterior margin of the helix. It arises below, from the spina helicis, and is inserted into the anterior border of the helix, just where it is about to curve backward.
  • The helicis minor is an oblique fasciculus, covering the crus helicis.

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