Cranial Nerve Palsy - I : Olfactory Nerve

Question 1

Anatomical Course of Olfactory Nerve.

Answer 1

1. Olfactory Receptors - Nasal Epithelium.
2. Axons Bundle into True Olfactory Nerves.
3. Small Foramina of Cribiform Plate of Ethmoid Bone.
4. Olfactory Bulb in Olfactory Groove of Anterior Cranial Fossa.
5. Inferior Surface of Frontal Lobe to Anterior Perforated Substance.

Question 2

Origin of Olfactory Nerve.

Answer 2

Cerebrum.

Question 3

Sensory Function of Olfactory Nerve.

Answer 3

1. Olfactory Mucosa - Roof of Nasal Cavity : Pseudostratified Columnar Epithelium.

Question 4

What is Anosmia?

Answer 4

Absence of sense of smell.

Question 5

Aetiology of Temporary Anosmia (2).

Answer 5

1. Infection e.g. Meningitis.

2. Local Disorders of Nose e.g. Common Cold.

Question 6

Aetiology of Permanent Anosmia (2).

Answer 6

1. Head Injury.

2. Tumours in Olfactory Groove e.g. Meningioma.

Question 7

Genetic Causes of Anosmia.

Answer 7

1. Kallman Syndrome.

2. Primary Ciliary Dyskinesia.