EXTERNAL EAR
- Side of Head
- Semicircular crumpled plate with a central aperture called
- EAR , OTO , AURIS
- Externally visible part, EXTERNAL EAR
- Auricle; pinna
- lower part
- Lobule of auricle; lobe of ear
- soft
- Auricular cartilage
- Helix
- Crus of helix
- Spine of helix
- Tail of helix
- Antihelix
- Triangular fossa
- Crura of antihelix
- Scapha
- Concha of auricle
- Cymba conchae
- Cavity of concha
- Antitragus
- Tragus
- Anterior notch
- Intertragic incisure; intertragic notch
- (Auricular tubercle Darwini)
- (Apex of auricle; tip of ear)
- Posterior auricular groove
- (Supratragic tubercle)
- Isthmus of cartilaginous auricle
- Terminal notch of auricle
- Fissura antitragohelicina
- Groove of crus of helix
- Fossa antihelica; antihelical fossa
- Eminentia conchae
- Eminentia scaphae
- Eminentia fossae triangularis
- Ligaments of auricle
- Anterior ligament of auricle
- Superior ligament of auricle
- Posterior ligament of auricle
- Auricular muscles
- Helicis major
- Helicis minor
- Tragicus
- (Muscle of terminal notch)
- Pyramidal muscle of auricle
- Antitragicus
- Transverse muscle of auricle
- Oblique muscle of auricle
- External acoustic meatus
- Features
- External acoustic pore; external acoustic aperture
- Tympanic notch
- Cartilaginous external acoustic meatus
- Cartilage of acoustic meatus
- Notch in cartilage of acoustic meatus
- Tragal lamina
- Framework
- Bony part
- tympanic plate of temporal bone
- C shaped
- Posterosuperior part is deficient
- Deficient part is formed by squamous temporal bone
- Cartilaginous Part
- C shaped
- Tympanic membrane
- Pars flaccida Shrapnell's membrane
- Pars tensa
- Anterior malleolar fold
- Posterior malleolar fold
- Malleolar prominence
- Malleolar stria
- Umbo of tympanic membrane
- Fibrocartilaginous ring
- Shape
- Oval
- Position
- placed obliquely at an angle of 55 degrees with floor of meatus
- Surfaces
- Outer surface
- thin skin
- concave
- Inner surface
- convex
- point of maximum convexity at attachment
- attached to handle of malleus
- called as umbo
- Margin
- membrane is thickened at its circumference
- fixed to tympanic sulcus of temporal bone on tympanic plate
- superiorly it is deficient
- attached to tympanic notch
- from ends of notch
- two bands arise
- anterior and posterior malleolar folds
- to attach lateral process of malleus
- Parts
- greater part of membrane is tightly stretched
- pars tensa
- part between two malleolar folds is loose
- pars flaccida
- crossed internally by chorda tympani nerve
- membrane is held tensed by inward pull
- tensor tympani muscle
- inserted on upper end of handle of malleus
- Structure
- outer cuticular layer of skin
- Middle fibrous layer
- superficial radiating fibres
- deep circular fibers
- inner mucous layer
- ciliated columnar epithelium
- Blood supply
- deep auricular branch of maxillary artery
- Nerve supply
- outer surface
- auriculotemporal nerve
- inner surface
- tympanic branch of glossopharyngeal nerve
