Cranial Nerve Origins Flashcards
Olfactory
Roof of Nasal Cavity
Optic
Retina
Oculomotor
Midbrain (medial part of midbrain)
Trochlear
Midbrain (lateral side of the midbrain)
Trigeminal
- Mesencephalic Nucleus in the midbrain.
- Principle (Central) pontine nucleus (PONS).
- Spinal Nucleus in the medulla oblongata.
- Trigeminal motor nucleus in the PONS.
Abducens
Pons
Facial
Pons
Vestibulocochlear
Pons and Medulla Oblongata
Glossopharyngeal
Medulla Oblongata
Vagus
Medulla Oblongata
Accessory
Spinal Component:
Origin: Upper spinal cord.
Path: Ascends into skull via foramen magnum → Briefly joins cranial component → Exits through jugular foramen.
Function: Innervates neck muscles (sternocleidomastoid & trapezius) for head-turning and shoulder-shrugging.
Cranial Component:
Origin: Medulla oblongata (brain).
Path: Briefly joins spinal component → Descends to join the vagus nerve.
Function: With vagus nerve, innervates throat muscles (pharynx & larynx).
Hypoglossal
Medulla oblongata