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Cranial Nerve 1Aka: Cranial Nerve I, Olfactory Nerve, CN 1
- Course
- Olfactory tract divides into roughly 20 branches
- Perforates cribriform plate of the ethmoid bone
- Physiology
- Innervates olfactory mucosa
- Upper third of the nasal septum
- Superior nasal concha
- Innervates olfactory mucosa
- Exam
- Precautions
- Ensure nasal patency
- Test one nostril at a time
- Avoid testing with noxious odors (e.g Ammonia)
- False positives due to Trigeminal Nerve stimulation
- Ability to identify odors
- Coffee
- Cloves
- Peppermint
- Precautions
Olfactory Nerve (C0028938) | |
|---|---|
| Definition (MSH) | The 1st cranial nerve. The olfactory nerve conveys the sense of smell. It is formed by the axons of OLFACTORY RECEPTOR NEURONS which project from the olfactory epithelium (in the nasal epithelium) to the OLFACTORY BULB. |
| Definition (CSP) | first cranial nerve; conveys the sense of smell; it is formed by the axons of olfactory receptor neurons which project from the olfactory epithelium (in the nasal epithelium) to the olfactory bulb. |
| Concepts | Body Part, Organ, or Organ Component (T023) |
| MSH | D009832 |
| English | cranial nerve I, Cranial Nerve Is, First Cranial Nerve, First Cranial Nerves, Olfactory Nerve, Olfactory nerve structure, Olfactory Nerves, Set of olfactory nerves |
| Spanish | estructura del nervio olfativo, estructura del nervio olfatorio, filete olfativo, I par craneal, nervio craneal I, nervio olfativo, nervio olfatorio, primer par craneal, primer par craneano |
| Parent Concepts | Olfactory Pathways (C0028939), Cranial Nerves (C0010268), Set of nerves (C0932025) |
| Sources | AOD, CSP, LCH, MSH, MTH, NCI, SCTSPA, SNOMEDCT, UWDA Derived from the NIH UMLS (Unified Medical Language System) |
