Transcript Ear mod
DEPARTMENT OF ANATOMY Head and Neck Dr. SREEKANTH THOTA ALICE IN ANATOMY LAND EAR • Do you know Gulliver ? Participants • Mr Rabbit. • Alice. Anatomy Professor • Who The _______ is Alice? Md 1 student • One day at windsor medical school • Alice followed the Mr Rabbit to the Garden. • What was the Mr rabbit saying? I am late……………. I am late • They saw 6 small hills in the garden surrounding a well • Alice peeped into the well and couldn’t see the bottom. • She rubbed her hand over the edge of the well and heard loud coughing sound • Mr rabbit jumped to the well and Alice followed. After the winding fall They reached a door. • Mr Rabbit Opened the Door and Alice Followed. • They saw GIANT BLACKSMITH hands coming from the either wall. • Right hand he held a hammer. • Left hand he held a stirrup. • As ALICE entered he stopped the work and put the stirrup on the window. • There was round table on the full of colourful snakes. Two crawled up the table . One crawled out. • A large two headed crawled on the top of one wall to the other. One head wrapped on the BLACKSMITH left hand . The other head was fastened with chord to opposite wall. • Alice said “ Mr Rabbit this is dangerous place find exit to get out of here. escape • They walked out of the gulliver’s mouth Ear Downloaded from: StudentConsult (on 10 December 2006 10:42 AM) © 2005 Elsevier EXTERNAL EAR • Auricle – Helix – Antihelix – Tragus – Lobule • External acoustic meatus - ends proximally at the tympanic membrane SENSORY INNERVATION OF THE 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) 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 – Malleus • Handle (manubrium) – Incus – Stapes • Base • Nerves – Tympanic plexus – Chorda tympani • Muscles – Stapedius m. – Tensor tympani m.