Jacobson\'s organ

[jey-kuhb-suhnz]

Ja·cob·son's or·gan

[jey-kuhb-suhnz]
noun Anatomy, Zoology.
either of a pair of blind, tubular, olfactory sacs in the roof of the mouth, vestigial in humans but well-developed in many animals, especially reptiles.

Origin:
1870–75; named after L. L. Jacobson (died 1843), Danish anatomist
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Jacobson's organ is always a great word to know.
So is spinal nerve. Does it mean:
one member of the two lowest pairs of ribs, which are attached neither to the sternum nor to the cartilages of other ribs.
a series of paired nerves that originate in the spinal cord and emerge, branching out to the region of the neck, trunk, or limbs
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