NEET BIOLOGY

Detailed explanation-1: -The ear canal starts at the outer ear and ends at the ear drum. The canal is approximately an inch in length. The skin of the ear canal is very sensitive to pain and pressure. Under the skin the outer one third of the canal is cartilage and inner two thirds is bone.

Detailed explanation-2: -Parts of the Outer Ear The outer ear consists of the visible portion on the side of the head, known as the pinna [1], and the external auditory canal (ear canal) [2]. The purpose of the pinna is to catch sound waves, amplify them slightly, and funnel them down the ear canal to the tympanic membrane (eardrum) [3].

Detailed explanation-3: -The internal auditory canal (IAC), also referred to as the internal acoustic meatus lies in the temporal bone and exists between the inner ear and posterior cranial fossa.

Detailed explanation-4: -The ear canal, also called the external acoustic meatus, is a passage comprised of bone and skin leading to the eardrum. The ear is comprised of the ear canal (also known as the outer ear), the middle ear, and the inner ear.

Detailed explanation-5: -Pathogenesis. The external auditory canal is approximately 2.5 cm long from the concha of the auricle to the tympanic membrane. The lateral half of the canal is cartilaginous; the medial half tunnels through the temporal bone.