olfactory nerves


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Related to olfactory nerves: Optic nerves

olfactory nerves

The nerves of smell and the first of the 12 paired CRANIAL NERVES arising directly from the brain. The olfactory nerves lie on the floor of the front section of the cranial cavity and run forward, close together, over the roof of the nose. From their terminal bulbs many tiny, hair-like filaments pass down through perforated bony plates (cribriform plates) into the upper part of the nose. Tiny particles of odorous material dissolved in the nasal secretions can be detected by the olfactory nerve endings with great sensitivity and discrimination.
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Peripheral damage is mostly caused by anatomical abnormalities of the nasal cavities, especially the olfactory cleft, and damage to the olfactory epithelium and the olfactory nerve. Olfactory dysfunction can also be a consequence of damage to or atrophy of the olfactory bulb, the olfactory cortex, and higher processing regions of the olfactory system, such as the limbic system.
The cerebral ganglia and olfactory nerves of all snails were removed in Tris-buffered saline (80 mmol 1-1 NaCl, 4 mmol 1-1KC1, 8 mmol 1-1CaC12, 5 mmol 1-1MgCl, 5 mmol 1-1Tris, pH 7.8) and fixed overnight in 4% formalin in 0.1 mol 1-1 phosphate buffer (PB).
Morphologic and behavioral studies have shown that the olfactory system recovers after bilateral olfactory nerve transection (BNX).
Nasal cytokines can affect the brain through signals sent via the vagus and olfactory nerves. In addition, sleep impairment, a suicide risk factor, can result from allergic rhinitis and from the decongestants often used by patients with active allergies.
OECs are present throughout the course of the olfactory nerves and can be harvested at the OM and the OB.
Severed olfactory nerves have the capacity to regenerate.
Scents from the oils are inhaled and stimulate the olfactory nerves in the nose.
These include early studies in nonhuman primates, which demonstrated the translocation of solid nanosized particles (30 nm poliovirus; 50 nm silver-coated gold colloids) along the axons of olfactory nerves into the olfactory bulb (Bodian and Howe 1941a, 1941b; DeLorenzo 1970).
While I'd been dreading "dissect and label the olfactory nerves of a dogfish", we actually got "dissect and label the nervous system of an earthworm".
The second study found that the zinc gel in Zicam can't get all the way up the nose to the olfactory nerves, even when it's sprayed.
Neurilemmomas arise from the neural sheath of the peripheral sensory, motor, sympathetic, and cranial nerves (with the exception of the optic and olfactory nerves).
Some of the olfactory nerves that transmit smell signals pass through the limbic system, so certain smells stimulate intense memories and recreate experiences.