Cranial Nerves Flashcards
GSA
General Somatic Afferent
- General sensation
SSA
Special Somatic Afferent
- Hearing, balance, vision
GVA
General Visceral Afferent
- general sensation from the Viscera
SVA
Special Visceral Afferent
- smell, taste
GSE
General Somatic Efferent
- somatic striated muscles
GVE
General Visceral Efferent
- Glands and smooth muscle (parasympathetic innervation)
SVE
Special Visceral Efferent
- Brachial arch striated muscle
I Olfactory
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- olfactory mucosa
- Olfactory foramina of the cribriform plate of the ethmoid bone
- SVA
- Sensory
- Nasal Cavity
- Smell
II Optic
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Retina
- Optic canal
- SSA
- Sensory
- Photoreceptors
- Vision
III Oculomotor
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- midbrain (level of superior colliculus)
- Superior Orbital fissure
- GSE, GVE
- Motor
- Superior, inferior and medial rectus,
Inferior oblique, Levator palpebrae,
Sphincter pupillae, Ciliary muscle - Eye movement, Raises upper eyelid,
Pupil constriction, Accommodation
IV Trochlear
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Midbrain (level of inferior colliculus)
- Superior Orbital fissure
- GSE
- Motor
- Superior oblique muscle
- depresses and abducts the eyeball
V Trigeminal
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Midbrain, pons, medulla, spinal cord
- V1: Superior orbital fissure
V2: Foramen rotundum
V3 Foramen ovale - SVE, GSA
- Mixed
- Skin of scalp, Conjunctiva, Ext. ear,
Skin of jaw, nose, nasal cavity, oralcavity, Muscle of mastication, Tensor timpani, Tensor veli palatini - Sensations of touch, pain, temperature, and pressure
Mastication
VI Abducens
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Pons (level of facial colliculus)
- Superior Orbital fissure
- GSE
- Motor
- Lateral rectus muscle
- Turns eyeball laterally
VII Facial
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Pons, lateral to CN VI and superior to CN VIII
- Internal acoustic meatus
Stylomastoid foramen - SVE, GVE, SVA, GSA
- both
- Muscle of facial expression,
Stapedius, Lacrimal glands, Palatine glands, Ear, Anterior two thirds of the tongue - Facial expression, Lacrimation, Secretion
Taste, Touch, pain, temperature from ear
VIII Vestibulocochlear
Origin
Cranial Opening
Fiber Components
Nerve Type
Structures supplied
Function
- Pontomedullary junction
- Internal acoustic meatus
- SSA
- sensory
- Vestibule, Semi-circular canals, cochlea
- Balance, Static equilibrium, Dynamic equilibrium, Hearing