WINDSOR UNIVERSITY SCHOOL OF MEDICINE DEPARTMENT OF ANATOMY Head and Neck Dr. SREEKANTH THOTA

Ear

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EXTERNAL EAR Auricle Helix Antihelix Tragus Lobule External acoustic meatus - ends proximally at the tympanic membrane

SENSORY INNERVATION OF THE AURICLE MAJOR BLOOD SUPPLY POST AURICULAR AND SUPF TEMP ARTERIES V3 TRIGEM BRACNH, MANDIBULAR NERVE AUREICULAR TEMP AND GREAT AURICULAR NERVE (CRANIEAL NERVES) VAGUS ALSO POST PART OF EXT AUDI MEATUS

Congenital microtia , Bifid earlobe , Supernumerary auricle Congenital microtia , Bifid earlobe , Supernumerary auricle

Cerebrospinal fluid (CSF) otorrhea

Tympanic Membrane The tympanic membrane (TM) is an oval, semi-transparent membrane that separates the external and middle ears. The orientation of the TM is slightly oblique to the sagittal plane; the TM is roughly conical, pointing medially. The handle of the malleus is attached to the medial aspect of the TM. The TM is divided into two parts: the pars flaccida (the portion superior to the insertion of the manubrium) and the pars tensa. The point at which the inferior end of the manubrium inserts into the TM is called the umbo.

Tympanic Membrane Perforation

Otoscopic examination Note: gently Pull Pinna Upwards and Outwards (directly Down and Back in children) PINNA UPWARD AND OUTWARD WARDS CHILDREN DOWN AND BACK B/C CURVED BACKWARD DIFF

MIDDLE EAR Boundaries and associated structures Roof Tegmen tympani Floor Lateral wall Tympanic membrane Medial wall Promontory Anterior wall Opening of the pharyngotympanic (auditory) tube Tensor tympani m. Posterior wall Aditus to antrum Stapedius m.

Contents Ossicles Nerves Muscles Malleus Incus Stapes Tympanic plexus Handle (manubrium) Incus Stapes Base Nerves Tympanic plexus Chorda tympani Muscles Stapedius m. Tensor tympani m.