What does the tympanic plexus innervate?
The branches to the tympanic cavity provide sensory innervation to the mucosa of the tympanic cavity and the internal surface of the tympanic membrane. The cell bodies of these neurons are found in the superior ganglion of the glossopharyngeal nerve.
What Innervates the tympanic membrane?
Nerve supply The inner surface of the tympanic membrane is innervated by the glossopharyngeal nerve.
How is tympanic plexus formed?
In the middle ear, the tympanic plexus is formed on the tympanic promontory by branches of Jacobson’s nerve (tympanic branch of the glossopharyngeal nerve) and caroticotympanic nerves originating from the internal carotid artery plexus.
What is the function of the tympanic cavity?
The tympanic cavity is a small cavity surrounding the bones of the middle ear. Within it sit the ossicles, three small bones that transmit vibrations used in the detection of sound.
What holds tympanic membrane in place?
The tympanic membrane is comprised of three layers of tissue: the outer cutaneous layer, the fibrous middle layer, and a layer of mucous membrane on its innermost surface. The membrane is held in place by a thick ring of cartilage, a tough but flexible kind of tissue.
What are the four quadrants of the tympanic membrane?
The TM is roughly divided into four quadrants denoted by the letters A (superior-anterior), B (inferior-anterior), C (inferior-posterior), and D (superior-posterior).
What is the function of the auditory tube?
The main function of the eustachian tube is ventilation of the middle ear and maintenance of equalized air pressure on both sides of the tympanic membrane (eardrum). Closed at most times, the tube opens during swallowing. This permits equalization of the pressure without conscious effort.
What is tympanic cavity?
The middle air or tympanic cavity is an air-filled space within the petrous pyramid of the temporal bone, lined by mucoperiosteum.