Middle Ear | Gross Anatomy | Part 4/9

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Middle Ear | Gross Anatomy | Part 4/9

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(0:00-4:20)
Middle Ear (ME) location in frontal view; External Ear, Tympanic Membrane, Inner Ear.

(4:25-8:45)
Superior view after removing the skull vault: Anterior, Middle and Poster Cranial Fossae. External, Middle and Inner Ear in superior view.; Petrous part of Temporal bone.

(8:49-11:50)
Lateral Wall= Membranous wall/Tympanic wall, Anterior Wall= Carotid wall, Medial Wall= Labyrinthine wall, Posterior Wall= Mastoid wall.

(11:52-21:58)
Sagittal section (Antero-posteriorly); (Upper part of) Anterior Wall= Eustachian Tube/Pharyngotympanic Tube, Posterior Wall= Mastoid Air Cells/Mastoid Antrum, Superior Wall/Roof of ME= Tegmen Tympani.

(22:00-26:50)
Clinical Co-relate: Roof of ME/Tegmen Tympani; ME infection leaking into Temporal Lobe potentially causing Meningitis, Extra Dural Abscess etc.]. Mastoid Antrum (Posterior wall): Infections/Inflammations here may leak into Posterior Cranial Fossa; Sigmoid Sinus, Brain Stem (BS) & Cerebellum; Thrombophlebitis of Sigmoid Sinus, Infections of BS & Cerebellum.

(26:51-30:00)
Sagittal section (SC) continued: Inferior Wall/Floor= Jugular Fossa (Jugular bulb of IJV); 9th, 10th & 11th Cranial Nerves, all buried in floor of ME, Tympanic branch of 9th Nerve entering into ME.

(30:01-31:20)
SC continued:(In front of) Lower part of Anterior Wall= Internal Carotid Artery (ICA), Sympathetic plexus (some branches of it enter into ME).

(31:25-32:23)
Recap/Summary.

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