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   A family of the order Rodentia containing 250 genera including the two genera Mus and Rattus, from which the laboratory inbred strains are developed. The fifteen subfamilies are HESPEROMYINAE (New World mice and rats), Cricetinae, Spalacinae, Myospalacinae, Lophiomyinae, Platacanthomyinae, Nesomyinae, Otomyinae, Rhizomyinae, MICROTINAE (Arvicolinae), GERBILLINAE, Dendromurinae, Cricetomyinae, Murinae (Old World mice and rats), and Hydromyinae.


1. A group of individuals related by blood or marriage or by a feeling of closeness. 2. A biological classification of related plants or animals that is a division below the order and above the genus. 3. A group of genes related in structure and in function that descended from an ancestral gene. 4. A group of gene products similarly related in structure and function and of shared genetic descent. 5. Parents and their children. The most fundamental social group in humans.

A subfamily of the Muridae consisting of 69 genera. New World mice and rats are included in this subfamily.

A common name used to describe a subfamily of the Muridae. Four of the more common genera are Cricetus, CRICETULUS; MESOCRICETUS; and PHODOPUS.

A subfamily of the Muridae consisting of several genera including Gerbillus, Rhombomys, Tatera, Meriones, and Psammomys.



Acneiform Eruptions
Visible efflorescent lesions of the skin caused by acne or resembling acne. (Dorland, 28th ed, p18, 575)

Acoustic Evoked Brain Stem Potential
Electrical waves in the cerebral cortex generated by brain stem structures in response to auditory click stimuli. These are found to be abnormal in many patients with cerebellopontine angle lesions, multiple sclerosis, or other demyelinating diseases.

Acorus calamus
A plant genus of the family ACORACEAE, order Arales, subclass Arecidae most notable for Acorus calamus L. root which contains asarone and has been used in traditional medicine.

A plant family of the order Arales, subclass Arecidae, class Liliopsida (monocot).

Aconitate Hydratase
An enzyme that catalyzes the reversible hydration of cis-aconitate to yield citrate or isocitrate. It is one of the citric acid cycle enzymes. EC


Acoustic Nerve
The cochlear part of the 8th cranial nerve (VESTIBULOCOCHLEAR NERVE). The cochlear nerve fibers originate from neurons of the SPIRAL GANGLION and project peripherally to cochlear hair cells and centrally to the cochlear nuclei (COCHLEAR NUCLEUS) of the BRAIN STEM. They mediate the sense of hearing.

Acoustic Maculas
Thickened areas of the saccule and utricle where the termination of the vestibular nerve occurs.

Acoustic Impedance Tests
Objective tests of middle ear function based on the difficulty (impedance) or ease (admittance) of sound flow through the middle ear. These include static impedance and dynamic impedance (i.e., tympanometry and impedance tests in conjunction with intra-aural muscle reflex elicitation). This term is used also for various components of impedance and admittance (e.g., compliance, conductance, reactance, resistance, susceptance).

Acoustic Nerve Disorders
Diseases of the vestibular and/or cochlear (acoustic) nerves, which join to form the vestibulocochlear nerve. VESTIBULAR NEURITIS, cochlear neuritis, and acoustic neuromas (NEUROMA, ACOUSTIC) are relatively common conditions that affect these nerves. Clinical manifestations vary with which nerve is primarily affected, and include hearing loss, vertigo, and tinnitus.

Acoustic Neuroma
A schwannoma that arises from the vestibular division of the vestibulocochlear nerve and tends to present in the fifth or sixth decade of life. Clinical manifestations include loss of hearing, headache, vertigo, facial pain, tinnitus, and facial weakness. Bilateral acoustic neuromas are associated with NEUROFIBROMATOSIS 2. (From Adams et al., Principles of Neurology, 6th ed, p673)

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