Category: L
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Labyrinthine nystagmus
Nystagmus due to disease of the labyrinthine vestibular apparatus. Nystagmus observed in labyrinth disorders.
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Lenticular nucleus
One of the nuclei forming part of the basal ganglia of the cerebrum, consisting of the globus pallidus and putamen. With the caudate nucleus, it forms the corpus striatum.
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Lateral geniculate nucleus
The visual relay nucleus of the thalamus. It is actually a set of nuclei located on the bottom rear edges of the thalamus, lateral to the medial geniculate nucleus. Axons from the retinal ganglion cells of the retina reach the lateral geniculate via the optic nerve and optic tract and then synapse in topographic order.…
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Lesser sciatic notch
A notch immediately below the spine of the ischium on the posterior border of the hip bone, which is converted into a foramen by the sacrotuberous ligament.
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Labial notch
A notch in the labial flange of a denture at the point where it crosses the frenum.
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Liquid nitrogen
Nitrogen cooled to 77° K. (77° above absolute zero). Liquid nitrogen is used to cool or freeze body parts (especially the skin) in anesthesia and some surgeries.
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Loss-of-function mutation
A change in DNA that results in the decreased production of a protein or a protein with impaired function. Loss-of-function mutations are usually recessive.
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Lumbrical muscle
In the hands and feet, any of the four intrinsic muscles that flex the straightened digits. They originate on the carpal or tarsal bones and attach on the proximal phalanges of digits 2 to 5. They act to flex the metacarpophalangeal joints while extending the interphalangeal joints.
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Laryngeal muscle
Any of the six short muscles inside the larynx that move the vocal apparatus and (except for the cricothyroid muscle) are innervated by the recurrent laryngeal branch of the vagus nerve (CN X).
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Lingual mucosa
The keratinized, papillated covering of the dorsum of the tongue that contains nerve endings for the sense of taste.