1.Afferent fibers are situated in the olfactory mucosa.Central process of sensory cells of olfactory epithelium the 20 unmyelinated fibers join to form olfactory nerve which passes through the cribriform plate of ethmoid, Bipolar neurons are the I st order neurons
2.Central processes of these neurons proceed to the olfactory bulb where they synapse with the 2nd order neurons, Olfactory bulb neurons form the olfactory tract which lies in the olfactory sulcus of frontal lobe which divides into medial and lateral striae
Olfactory trigone dividing into medial and lateral striae. Some fibers of the medial join with the opposite side
Medial striae terminates in the medial surface of cerebral hemisphere – subcallosal and cingulate gyrus,
Medial striae on either side communicate with each other terminates in the medial surface of cerebral hemisphere - subcallosal and cingulate gyrus
Lateral striae ends in the primary olfactory cortex-- piriform lobe of hippocampus, amygdaloid nucleus and hypothalamus.
Secondary olfactory areas are the uncus and parahippocampal gyrus
Lateral striae ends in piriform lobe of hippocampus, amygdaloid nucleus and hypothalamus.
What are the functions of olfactory nerve ?
To carry smell sensation from nasal mucosa to olfactory bulb
Olfactory nerve subserves the sense of smell.
Anatomical Peculiarity of olfactory nerve ?
2.Central processes of these neurons proceed to the olfactory bulb where they synapse with the 2nd order neurons, Olfactory bulb neurons form the olfactory tract which lies in the olfactory sulcus of frontal lobe which divides into medial and lateral striae
Olfactory trigone dividing into medial and lateral striae. Some fibers of the medial join with the opposite side
Medial striae terminates in the medial surface of cerebral hemisphere – subcallosal and cingulate gyrus,
Medial striae on either side communicate with each other terminates in the medial surface of cerebral hemisphere - subcallosal and cingulate gyrus
Lateral striae ends in the primary olfactory cortex-- piriform lobe of hippocampus, amygdaloid nucleus and hypothalamus.
Secondary olfactory areas are the uncus and parahippocampal gyrus
Lateral striae ends in piriform lobe of hippocampus, amygdaloid nucleus and hypothalamus.
What are the functions of olfactory nerve ?
To carry smell sensation from nasal mucosa to olfactory bulb
Olfactory nerve subserves the sense of smell.
Anatomical Peculiarity of olfactory nerve ?
- This is the only sensory pathway having no thalamic connection .
- Purely sensory cranial nerve
- Special visceral afferent fibres
