1
ANATOMY & PHYSIOLOGY IBIO 211:
Dr. Lawrence G. Altmanwww.lawrencegaltman.comSome illustrations are courtesy of McGraw-Hill.
The
EARPart 1 of 2
SPECIAL SENSESLABS:
Dr. Lawrence G. Altmanwww.lawrencegaltman.comSome illustrations are courtesy of McGraw-Hill.
2
3
3 OSSICLES:
AURICLE
TYMPANICMEMBRANEa.k.a theEARDRUM
ROUND WINDOW
TYMPANIC CAVITY
AUDITORY TUBEa.k.a. EUSTACHIAN
OVAL WINDOW
STAPESINCUSMALLEUS equivalent-
p. 470
4
TYMPANICMEMBRANEa.k.a theEARDRUM
TYMPANIC CAVITY
OVALWINDOW
STAPES
INCUS
5
COCHLEA
SEMICIRCULARDUCTS
VESTIBULEUTRICLE
SACCULE
6
VESTIBULARMEMBRANE
TECTORIALMEMBRANE
BASILARMEMBRANE
ORGAN OF
CORTI
SCALAVESTIBULI
COCHLEARDUCT
SCALATYMPANI
7
TECTORIAL MEMBRANE
BASILAR MEMBRANE
equivalent-
p. 473
8
COCHLEA
SCALA VESTIBULICOCHLEAR DUCT
SCALA TYMPANI next plate: enlargement of this area
Another Perspective....
Theory and Problems of Human Anatomy & Physiology, K.M. Van De Graaf and R.W. Rhees, McGraw-Hill, 1997
9
VESTIBULAR MEMBRANE TECTORIAL
MEMBRANE
BASILAR MEMBRANECOCHLEAR
NERVE
HAIR CELLS
Another Perspective....
Theory and Problems of Human Anatomy & Physiology, K.M. Van De Graaf and R.W. Rhees, McGraw-Hill, 1997
10Last Plate The EAR (Part 1 of 2)
Sequence of events involved in hearing. 1. Sound waves are funneled by the auricle into the external auditory
meatus. 2. The sound waves strike the tympanic membrane, causing it to vibrate. 3. Vibrations of the tympanic membrane are amplified as they pass
through the malleus, incus, and stapes.
4. The vestibular window (oval window) is pushed back and forth by the stapes.
5. Vibrations of the vestibular window set up pressure waves in the
perilymph of the cochlea. 6. The pressure waves area propagated through the scala vestibuli and the scala tympani to the endolymph contained within the cochlear duct. 7. Stimulation of the hair cells within the spiral organ of the cochlea causes the generation of nerve impulses in the cochlear nerve (a portion of the vestibular[eighth cranial] nerve), which pass into the pons of the brain.
