Cranial nerve 1-8 - innervation and functions PDF

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Summary

innervation and functions...

Description

Nerve

Fiber Types

Cranial Exit

Target

Pathway

Olfactory (CN I) Optic (CN II)

Special Sensory (Sight)

Cribiform plate

Olfactory information from nasal cavity

Olfactory Epithelia Cribiform plate  olfactory nerves  [synapse] olfactory bulb/tractbrain

Special Sensory (Smell)

Optic Canal

Visual information from Retinal

Retina [synapse] optic nerve/tratoptic canal optic chiasmbrain

5/7 Extraocular Muscles (SIMI+L) SR, IR, MR, IO, (LPS) Ciliary mm.

Midbrain  Cavernous sinus  Superior orbital fissureOrbit mm

General Motor

*Oculomotor

Accessory Oculomotor Nucleus  Inferior Oculomotor nn. [synapse] Ciliary Ganglion Short ciliary nn. (branch of V1)  muscles

(CN III)

Visceral Motor (Pre-ganglionic Parasympathetic)

Superior Orbital Fissure

Trochlear (CN IV)

General Motor (eye movement)

Superior Orbital Fissure

1/7 Extraocular: Superior Oblique mm.

Midbrain  Cavernous sinus  Superior orbital fissureOrbit mm

Ophthalmic (V1) [NFL]

General Sensory

Superior Orbital Fissure

Maxillary (V2) [ZIP nn] Mandibular (V3) [BAIL .]

General Sensory

Foramen Rotundum

upper eyelid, dorsum of nose, forehead, part of scalp upper teeth, lower eyelid, nose, upper lip and cheek anterior 2/3 of tongue, lower teeth, jaw skin, temporal face, external ear 4 Mastication mm. (Medial + Lateral Pterygoid, Masseter, Temporalis) 4 Other mm. (Tensor veli Palatine, Tensor

Lateral Sides of Pons Trigeminal Ganglion Cavernous sinus  Superior orbital fissureOrbit  Various [NFL] nerves  Facial mm. Corneal Reflex (affarent) Lateral Sides of Pons Trigeminal Ganglion foramen Rotundum  Cavernous sinus Various [ZIP] nerves target Lateral Sides of Pons Trigeminal Ganglion foramen ovale infratemporal fossa Various [BAIL] nerves target Lateral Sides of Pons Trigeminal Ganglion foramen ovale infratemporal fossa Target mm.

Trigeminal (CN V)

+

Sphincter Pupillae mm.

General Sensory Foramen Ovale Brachial Motor (1st Pharyngeal Arch)

Tympani, Mylohyoid, Anterior Belly of Digastric)

Abducens (CN VI)

General Motor (eye movement)

Superior Orbital Fissure

1/7 Extraocular: Lateral Rectus mm.

Between Pons/Medulla  Cavernous sinus  Superior orbital fissureOrbit mm

Brachial Motor (2nd Pharyngeal Arch)

Internal Acoustic Meatus +

ALL Muscles of facial Expression (Orbicularis Oculi/oris, Buccinator, Platysma) + 3 Additional Muscles (Stapedius, Stylohyoid, Posterior Belly of digastric) Skin around ear (Not clinically relevant)

Internal Acoustic MeatusFacial CanalGeniculate GanglionStylomastoid Foramen Target mm. Corneal Reflex (efferent)

Anterior 2/3 Tongue

Internal Acoustic MeatusFacial CanalGeniculate GanglionChorda Tympani Infratemporal Fossa (Joins Lingual nn(V3))Tongue Pre-Gang: Superior Salivatory Nucleus  Internal Acoustic MeatusFacial CanalGeniculate Ganglion  Chorda Tympani Infratemporal Fossa(Joins Lingual nn(V3)) [synapse] Submandibular ganglion Post Gang: ganglion  glands Pre Gang: Superior Salivatory Nucleus  Internal Acoustic MeatusFacial CanalGeniculate Ganglion  greater petrosal nn.  Vidian nn.  [synapse] Pterygo-palatine ganglion

Facial Canal +

Stylomastoid foramen

*Facial Nerve (CN VII) [4 Fibers]

General Sensory Special Sensory (Taste) Visceral Motor (Pre-ganglionic Parasympathetic)

Internal Acoustic Meatus + Facial Canal

Sublingual +

Submandibular Glands Lacrimal Glands

n/a...