THE EAR PART 1 DEPARTMENT OF HUMAN ANTOMY
- Slides: 23
THE EAR – PART 1 DEPARTMENT OF HUMAN ANTOMY – MUCOM 2019
Objectives Ø Know the anatomical divisions of the ear and its main function Ø Learn the main features of the external ear including features of the auricle with its innervation and blood supply. Ø Know structure, innervation, blood supply and function of external acoustic canal and tympanic membrane Ø Demonstrate the main anatomical features of middle ear, including bony ossicles and main relations of middle ear cavity. 04 December 2020 Department of Human Anatomy - MUCOM 2019 2
The ear is the organ of hearing and balance. It has three parts: Department of Human Anatomy - MUCOM 2019 3 04 December 2020
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AURICLE (Pinna) Department of Human Anatomy - MUCOM 2019 5 04 December 2020
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External Acoustic Meatus The external acoustic meatus does not follow a straight course. From the external opening it passes upward in an anterior direction, then turns slightly posteriorly still passing upward, and finally, turns again in an anterior direction with a slight descent. For examination purposes, observation of the external acoustic meatus and tympanic membrane can be improved by pulling the ear superiorly, posteriorly, and slightly laterally 2. 5 cm Sensory Innervation branches of the auriculotemporal nerve (anterior and superior walls), and the auricular branch of the vagus nerve (posterior and inferior walls). Department of Human Anatomy - MUCOM 2019 7 04 December 2020
Tympanic membrane It lies at an angle and thus Its lateral surfaces inferiorly and anteriorly. Department of Human Anatomy - MUCOM 2019 8 04 December 2020
Tympanic membrane Department of Human Anatomy - MUCOM 2019 9 04 December 2020
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The middle ear is an air-filled, mucous membrane–lined space in the temporal bone between the tympanic membrane laterally and the lateral wall of the internal ear medially. Department of Human Anatomy - MUCOM 2019 12 04 December 2020
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Pharyngotympanic Tube • Equalizes pressure on both sides of the tympanic membrane. • It pass forward, medially, and downward to enter the nasopharynx. • Branches from the ascending pharyngeal artery and from the middle meningeal artery and the artery of the pterygoid canal. • The pterygoid venous plexus. • Tympanic Plexus (glossopharyngeal nerve). Department of Human Anatomy - MUCOM 2019 16 04 December 2020
Auditory Ossicles q Malleus q Incus q Stapes Department of Human Anatomy - MUCOM 2019 17 04 December 2020
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