The narrow gutter between the helix and antihelix is named scaphoid fossa. Its upper end splits into 2 crura enclosing a triangular depression named triangular fossa. Antihelix is just another notable ridge present in front and parallel to the posterior part of helix, partially encircling the concha.It’s likely erroneously thought to represent the vestige of the pointed part of the quadruped ear. The posterior limb finishes below as flabby ear lobe and its upper end occasionally presents a small elevation referred to as Darwin’s tubercle. An anterior limb ends as crus of helix, which breaks up the concha into smaller upper and bigger lower parts. It includes 2 limbs-anterior and posterior. Helix creates a notable peripheral rim of the pinna.It’s guarded in front by a triangular flap of cartilage, the tragus.
The auricle presents 2 surfaces: medial and lateral. The auricular cartilage stays constant with the cartilage of the external auditory meatus. The lobule of pinna is made of fibrofatty tissue covered with skin. With the exception of its lobule the whole pinna is composed of a single bit of crumpled yellow elastic cartilage covered with skin. The auricle is located on the side of the head and is trumpet-like undulating projection.
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