Table of Contents
- 1 Where do olfactory signals pass through?
- 2 Which bone has holes for olfactory receptors?
- 3 What does the olfactory tract pass through?
- 4 What is the normal pathway of smell?
- 5 What causes olfactory nerve damage?
- 6 How does olfactory nerve damage?
- 7 Where does the olfactory nerve terminate in the brain?
- 8 Where are the nerve fibers located in the olfactory bulb?
Where do olfactory signals pass through?
Olfactory pathway and nerve
| Function | Special sense of smell |
|---|---|
| Olfactory nerve | CN I formed out of a collection of olfactory receptor cell axons, which pass through the cribriform plate and into the roof of the nasal cavity. |
| Olfactory bulb | It is the relay station of the olfactory pathway and contains olfactory glomeruli. |
Which bone has holes for olfactory receptors?
ethmoid bone
The sense of smell is detected by olfactory receptors located within the nasal epithelium. Their axons (fila olfactoria) assemble into small bundles of true olfactory nerves, which penetrate the small foramina in the cribriform plate of the ethmoid bone and enter the cranial cavity.
What bone must the olfactory cells pass through to meet the olfactory bulb?
Olfactory Nerve Impulses The axons of the olfactory neurons extend from the basal surface of the epithelium, through an olfactory foramen in the cribriform plate of the ethmoid bone, and into the olfactory bulb, located on the ventral surface of the frontal lobe.
What does the olfactory tract pass through?
Each olfactory receptor cell emits two processes (projections). The other process is a long and extremely thin axon, the olfactory nerve fibre, which reaches the cranial cavity by passing through one of the openings in the bony roof of the nasal cavity and enters the olfactory bulb of the forebrain.
What is the normal pathway of smell?
The general outlines of the olfactory pathway have been known for about two decades. An odor, a mixture of molecules floating in air, enters the nose and travels to the top of the nasal passages, where it meets a batch of nerve cells. These cells, called the olfactory epithelium, have direct connections to the brain.
Where is the primary olfactory cortex located?
temporal lobe
The Chemical Senses Mitral cells and tufted cells send their process to the primary olfactory cortex, which is located on the inferior surface of the temporal lobe. These connections are unique in that they are the only sensory connections that do not travel through the thalamus before making connections in the cortex.
What causes olfactory nerve damage?
The olfactory nerve can be damaged through trauma eg TBI; Blunt trauma to the head can lead to laceration of the olfactory nerve as it crosses the ethmoid bone; Infections can also cause damage to the olfactory nerve.
How does olfactory nerve damage?
Where are the receptors located in the olfactory system?
Olfactory Receptor Cells. Located on the dendrite’s surface are 10-20 non motile cilia that extend into the fluid layer covering the epithelium in the nose. The cilia contain receptors for odor molecules that pass into the nasal cavity and are captured in the fluid covering the olfactory epithelium.
Where does the olfactory nerve terminate in the brain?
Master the olfactory nerve anatomy as well as the other cranial nerves with our study units: The axons projecting from the olfactory receptor cells via the olfactory nerve terminate within the olfactory bulb. The olfactory bulb is the main relay station within the olfactory pathway.
Where are the nerve fibers located in the olfactory bulb?
Olfactory Bulb. Therefore, it lies on the underside of medial aspect of the frontal lobe. Within the olfactory bulb are bundles of nerve fibers known as glomeruli; where incoming receptor cell axons make connections with the dendrites of mitral relay neurons.
Which is the main relay station in the olfactory pathway?
The olfactory bulb is the main relay station within the olfactory pathway. Information from the receptor cells is passed to cells whose projections make up the subsequent olfactory tract.