The Olfactory nerve (I) – for sense of smell. Nerves in nasal cavity synapse within olfactory bulbs.
The Oculomotor nerve (III) - Controls 4 of the 6 extrinsic muscles of the eye. The Trochlear nerve (IV) • Innervates superior oblique eye muscle.
The Trigeminal nerve (V) Largest of all the cranial nerves Has 3 Branches 1) Ophthalmic branch skin, lacrimal gland 2) Maxillary branch lower eyelid, upper jaw 3) Mandibular branch tongue, lower teeth
The Abducens nerve (VI) • Innervates lateral rectus muscle of eye (abduction!) • The Facial nerve (VII) • Controls muscles of scalp and facial expression. • Muscles of mastication and speech. • Pressure sensations from face. • Taste sensations from anterior 2/3 of tongue.
The Vestibulocochlear nerve (VIII) • Monitors sense of balance, position and movement and also monitors hearing.
The Glossopharyngeal nerve (IX) Taste sensation from posterior 1/3 tongue. Controls swallowing Detects O2 and CO2 content of blood in carotid artery.
The Vagus nerve (X) Vital to autonomic control of visceral function
The Accessory nerve (XI) • Internal branch Innervates swallowing muscles. • External branch Controls sternocleidomastoid and trapezius. • The Hypoglossal nerve (XII) • Voluntary food mixing, swallowing and speech. • Control of tongue movements.
Fig 18.6 FYI
Oculomotor Nerve (III) Trochlear Nerve (IV) Abducens Nerve (VI)
Accessory Nerve (XI) Hypoglossal Nerve (XII)