Tensor Tympani
Ear · Head & Neck
The tensor tympani is a small muscle of the middle ear that works with the stapedius to protect hearing from loud sounds. It arises from the cartilaginous part of the pharyngotympanic (auditory) tube and the walls of its own bony canal in the greater wing of the sphenoid, then runs forward before its tendon hooks around a bony pulley and inserts on the handle (manubrium) of the malleus. By pulling the manubrium medially it tenses the tympanic membrane, damping the transmission of loud vibrations through the ossicular chain. Unlike most muscles of the ear region, which are supplied by the facial nerve, the tensor tympani is innervated by a branch of the mandibular division of the trigeminal nerve (CN V3), reflecting its development from the first pharyngeal arch.
Origin, Insertion, Action & Nerve
Origin
Cartilaginous part of the pharyngotympanic (auditory) tube and the walls of its bony canal (greater wing of sphenoid)
Insertion
Handle (manubrium) of the malleus
Action
Tenses the tympanic membrane to dampen loud sounds
Nerve
Nerve to tensor tympani (from the medial pterygoid nerve, mandibular nerve CN V3)
Attachments explained
The Tensor Tympani is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Cartilaginous part of the pharyngotympanic (auditory) tube and the walls of its bony canal (greater wing of sphenoid)
Insertion
Handle (manubrium) of the malleus
Action & function
When the Tensor Tympani contracts, it produces the following movement: Tenses the tympanic membrane to dampen loud sounds.
As part of the Ear group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Tensor Tympani receives its nerve supply from the Nerve to tensor tympani (from the medial pterygoid nerve, mandibular nerve CN V3).
Because a muscle can only contract when its nerve is intact, injury to the Nerve to tensor tympani can weaken or paralyse the Tensor Tympani, impairing the movements it normally produces (tenses the tympanic membrane to dampen loud sounds). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Tensor Tympani (the OIANS method)
Learn the tensor tympani by tracing its line of pull to its insertion on the handle of the malleus: tensing that ossicle tightens the eardrum and reduces loud sound transmission, which is the muscle's whole purpose. Because it lies alongside and above the auditory tube, it is easy to remember that it originates in relation to that tube and the sphenoid canal that carries it.
The memorable distinction is the nerve. Tensor tympani develops from the first pharyngeal arch, so it is supplied by the mandibular nerve (CN V3), whereas its partner stapedius comes from the second arch and takes the facial nerve. Study the two ear muscles together as a first-arch versus second-arch pair, and you will never confuse their innervation on an exam.
Frequently asked questions
Where is the Tensor Tympani located?
The Tensor Tympani is a muscle of the Ear group, located in the Head & Neck.
What is the origin of the Tensor Tympani?
Cartilaginous part of the pharyngotympanic (auditory) tube and the walls of its bony canal (greater wing of sphenoid)
What is the insertion of the Tensor Tympani?
Handle (manubrium) of the malleus
What movements does the Tensor Tympani produce?
Tenses the tympanic membrane to dampen loud sounds
What nerve supplies the Tensor Tympani?
Nerve to tensor tympani (from the medial pterygoid nerve, mandibular nerve CN V3)
Is the Tensor Tympani free to study in OIANS?
The Tensor Tympani is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Head & Neck is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
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