Pinna / Auricle

AURICLE OR PINNA
  • The entire pinna (except its lobule and outer part of external acoustic canal) is made up of a framework of a single piece of yellow elastic cartilage
  • It is covered with integument, and connected to the surrounding parts by ligaments and muscles; and to the commencement of the external acoustic meatus by fibrous tissue. 
  • Elastic cartilage, if damaged, repairs itself with fibrous tissue.
  • Pinna develops from the cleft of 1st and 2nd pharyngeal arch
  • Ear pinna develops from Ectoderm
  • Skin over the pinna is closely adherent to the perichondrium on the lateral surface while it is loosely attached on the medial surface.
  • There is no cartilage between the tragus and crus of the helix – incisura terminalis
  • An incision made in this area will not cut through the cartilage – used for endaural approach in surgery of external auditory canal and mastoid
Nerve Supply
Skin of pinna is supplied majorly by
  • Greater auricular nerve(C2C3)- Major Part supplied by it
  • Lesser occipital nerve(C2)
  • Auriculotemporal nerve (mandibular branch of 5th nerve) and
With little contribution from
  • Auricular branch of Vagus (Arnold's N)
  • Facial nerve
Sensory nerve supply of pinna is Mandibular nerve
Cauliflower ear (boxer's ear, wrestler's ear)
is an acquired deformity of the outer ear.
In this injury, the ear can shrivel up and fold in on itself and appear pale, giving it a cauliflower-like appearance, hence the term cauliflower ear.
Wrestlers, boxers and martial artists in particular are susceptible to this type of injury.
When the ear is struck and a blood clot develops under the skin, or the skin is sheared from the cartilage, the connection of the skin to the cartilage is disrupted.

Exam Question
  • The entire pinna (except its lobule and outer part of external acoustic canal) is made up of a framework of a single piece of yellow elastic cartilage
  • Pinna develops from the cleft of 1st and 2nd pharyngeal arch
  • Ear pinna develops from Ectoderm
  • Skin over the pinna is closely adherent to the perichondrium on the lateral surface while it is loosely attached on the medial surface.
  • Greater auricular nerve(C2C3)-Supplies Major Part of Pinna
  • Sensory nerve supply of pinna is Mandibular nerve
  • Cauliflower ear (boxer's ear, wrestler's ear)
  • is an acquired deformity of the outer ear.
  • In this injury, the ear can shrivel up and fold in on itself and appear pale, giving it a cauliflower-like appearance, hence the term cauliflower ear.
  • Wrestlers, boxers and martial artists in particular are susceptible to this type of injury.
  • When the ear is struck and a blood clot develops under the skin, or the skin is sheared from the cartilage, the connection of the skin to the cartilage is disrupted.

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