| Jacobson's canal | A minute canal passing from the inferior surface of the petrous portion of the temporal bone between the jugular fossa and carotid canal to the floor of the tympanic cavity. Located in the wedge of bone separating the jugular canal and carotid canal, it transmits the tympanic branch of the glossopharyngeal nerve. Synonym: canaliculus tympanicus, Jacobson's canal, tympanic canal. (05 Mar 2000) |
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| Jacobson's cartilage | A narrow strip of cartilage located between the lower edge of the cartilage of the nasal septum and the vomer. Synonym: Jacobson's cartilage, paraseptal cartilage, vomer cartilagineus, vomerine cartilage, vomeronasal cartilage. (05 Mar 2000) |
| Jacobson's nerve | <anatomy, nerve> A nerve from the inferior ganglion of the glossopharyngeal nerve, passing through the tympanic canaliculus to the tympanic cavity, forming there the tympanic plexus which supplies the mucous membrane of the tympanic cavity, mastoid cells, and auditory tube; presynaptic parasympathetic fibres also pass through the tympanic nerve via the lesser superficial petrosal nerve to the otic ganglion, where they synapse with postsynaptic fibres that continue to supply the parotid gland. Synonym: nervus tympanicus, Andersch's nerve, Jacobson's nerve. (05 Mar 2000) |
| Jacobson's organ | A specialised part of the olfactory system located anteriorly in the nasal cavity within the nasal septum. Chemosensitive cells of the vomeronasal organ project via the vomeronasal nerve to the accessory olfactory bulb. The primary function of this organ appears to be in sensing pheromones which regulate reproductive and other social behaviours. While the structure has been thought absent in higher primate adults, data now suggests it may be present in adult humans. (12 Dec 1998) |
| Jacobson's plexus | A plexus on the promontory of the labyrinthine wall of the tympanic cavity, formed by the tympanic nerve, an anastomotic branch of the facial, and sympathetic branches from the internal carotid plexus; it supplies the mucosa of the middle ear, mastoid cells, and auditory (eustachian) tube, and gives off the lesser superficial petrosal nerve to the otic ganglion. Synonym: plexus tympanicus, Jacobson's plexus. (05 Mar 2000) |
| Jacobson's reflex | Flexion of the fingers elicited by tapping the flexor tendons over the wrist joint or the lower end of the radius. (05 Mar 2000) |
| Jacobson, Ludwig | <person> Danish anatomist, 1783-1843. See: Jacobson's anastomosis, Jacobson's canal, Jacobson's cartilage, Jacobson's nerve, Jacobson's organ, Jacobson's plexus, Jacobson's reflex. (05 Mar 2000) |
| Jacquart's facial angle | A facial angle with the intersection always at the nasal spine point; additional variation uses the supraorbital point instead of the glabella, and this latter version is also known as ophryospinal facial angle or Topinard's facial angle. (05 Mar 2000) |
| Jacquart, Henri | <person> 19th century French physician. See: Jacquart's facial angle. (05 Mar 2000) |
| Jacquemet's recess | A pouch of peritoneum between the gallbladder and the liver. (05 Mar 2000) |
| Jacquemet, Marcel | <person> French anatomist, 1872-1908. See: Jacquemet's recess. (05 Mar 2000) |
| Jacquemin's test | A test for phenol; to the suspected fluid an equal amount of aniline is added, and, after thorough admixture, a little solution of sodium hypochlorite; if phenol is present the fluid becomes blue. (05 Mar 2000) |
| Jacquemin, Emile | <person> 19th century French chemist. See: Jacquemin's test. (05 Mar 2000) |
| Jacques' plexus | A nerve plexus within the muscular coat of the uterine (fallopian) tube. (05 Mar 2000) |
| Jacques, Paul | <person> 19th century French physician. See: Jacques' plexus. (05 Mar 2000) |