A&P PNS

Olfactory (CN I)

Sensory

Smell

Exits at Cribriform plate of Ethmoid bone

Optic (CN II)

Sensory

Visual & Visual field

Exits at Optic Foramen

Occulomotor (CN III)

Motor

Eye muscles and pupil

Exits at Superior Orbital Fissure

Carries Parasympathetic Axons

Trochlear (CN IV)

Motor

Eye muscle (Superior Oblique)

Exits at Superior Orbital Fissure

Trigeminal (CN V) - V1

Sensory

Forehead, Around eyes, Cornea

Exits at Superior Orbital Fissure

Trigeminal (CN V) - V2

Sensory

Teeth, Skin over maxilla

Exits at Foramen Rotundum

Trigeminal (CN V) - V3

Both

S - Teeth of lower jaw, tongue

M - Mastication (Temporalis, Massater)

Exits at Foramen Ovale

Abducens (CN VI)

Motor

Eye muscle (Lateral Rectus)

Exits at Superior Orbital Fissure

Facial (CN VII)

Both

S - Taste on anterior part of tongue, External ear

M - Facial expression

Exits and Internal Auditory Meatus and Stylomastoid foramen’

Carries Parasympathetic Axons

Vestibulocochlear (CN VIII)

Sensory

Hearing and balance

Exits at Internal Auditory Meatus

Glossopharyngeal (CN IX)

Both

S - Taste in posterior part of tongue, Pharynx

M - Pharyngeal muscles

Exits at Jugular Foramen

Carries Parasympathetic Axons

Vagus (CN X)

Both

S - Thoracic and abdominal viscera

M - Parasympathetic to abdominal organs

Exits at Jugular Foramen

Carries Parasympathetic Axons

Spinal Accessory (CN XI)

Motor

SCM and Trapezius

Exits at Jugular Foramen

Hypoglossal (CN XII)

Motor

Tongue and throat muscles

Exits at Hypoglossal Canal

Superior Oblique Muscle of Eye

Moves the eye down and out

Controlled by Trochlear (CN IV)

Inferior Oblique Muscle of Eye

Move the eye up and out

Controlled by Occulomotor (CN III)

Lateral Rectus Muscle of Eye

Moves the eye laterally

Controlled by Abducens (CN VI)

Medial Rectus Muscle of Eye

Moves the eye medially

Controlled by Occulomotor (CN III)

Superior Rectus Muscle of Eye

Moves the eye superiorly

Controlled by Occulomotor (CN III)

Inferior Rectus Muscle of Eye

Moves the eye inferiorly

Controlled by Occulomotor (CN III)

Dorsal roots

Sensory

Afferent

Ventral roots

Motor

Efferent

Dorsal rami

Innervate most deep muscles of the dorsal trunk for movement of the vertebral column, and skin near the midline of the back.

Ventral rami

Form the intercostal nerves in the thoracic region - everywhere else they form the nerve plexuses

Cervical Plexus

C1-C4

Most of the nerves off this plexus carry sensation from the neck

C3,4&5 keep you alive (Diaphragm)

Brachial Plexus

C5-T1

Axillary, Musculocutaneous, Radial, Median, Ulnar