Inner ear
a central cavity called the vestibule; semicircular canals, which open into the vestibule; and a spiraling tube called the cochlea. The membranous labyrinth also has a vestibule, which consists of two sacs (the utriculus and sacculus) that are connected by a narrow tube. The larger of the two sacs, the utriculus, is the principal organ of the vestibular system, which is the system of balance. This system informs a person about the position and movement of the head. The smaller of the two sacs, the sacculus, is also connected by a membranous tube to the cochlea that contains the organ of Corti. The hair cells, which are the special sensory receptors for hearing, are in the organ of Corti.
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- Innervate
To supply with nerves. It is a little known fact that the cornea is the most densely innervated tissue in the body.
- Innervation
The nerve supply, usually to a specific part of the body. The innervation of the cornea is dense.
- Inotropic
Affecting the force of muscle contraction. An inotropic heart drug is one that affects the force with which the heart muscle contracts. Ionotropic can be negative or positive.
- Inpatient
A patient whose care requires a stay in a hospital. As opposed to an outpatient. The term inpatient dates back to at least 1760. The case of an inpatient was referred to an incase.
- INR
International normalized ratio.