-
I Olfactory Nerve
component
function
consists of
damage
- only a special sensory (afferent) component
- function = sense of smell or olfaction
- olfactory system consists of the olfactory epithelium, bulbs and tracts along with olfactory areas of the brain collectively known as the rhinencephalon
- most common damage is ansomia (loss of sense of smell and taste)
-
II Optic Nerve
component
function 3
- special sensory (afferent) component only
- function- conveys visual info from the retina
- visual info enters eye in form of photons of light
- convereted to electrical signals in the retina
- signals carried via optic nerves, chiasm, and tract to the lateral geniculate nucleus of each thalamus
- then to the visual centers of the brain for interpretation
- diagram p. 597
-
III Oculomotor
supplies
function 2
- supplies motor component
- moves muscles of the eyelids
- movement of eye for visual tracking or fixation on an object
-
IV Trochlear Nerve
component
function
- motor component
- eye movements- specifically turns eye down and outward
-
V Trigeminal
components
3 branches
- both sensory and motor components
- Opthalmic
- Maxillary
- Mandibular
-
Opthalmic brach of V Trigeminal
- sensory only
- info from skin on upper face, forehead, scalp, cornea, iris, upper eyelid
-
Maxillary brach of V Trigeminal
- sensory info only
- lower eyelid, skin on side of nose, upper jaw, lip, mucosal lining of buccal and nasal cavities, maxillary sinuses, and nasopharynx
-
Mandibular brach of V Trigeminal
- sensory info from mandible, lower teeth, gums and lip, EAM, auricle, are of temporal lobe, anterior 2/3 of tongue and floor of mouth
- motor innervations are the muscles of mastication elevates hyoid, tenses palate
-
-
lacrinal gland
nasal cavity
-
VI Abducens
- motor component only
- lateral eye movement
-
VII Facial
- Both sensory and motor components
- motor innervation to facial muscles
- elevates hyoid bone
- sense of taste to anterior 2/3 of the tongue, hard and soft palates
- salivation
-
VII Vestibulocochlear
- motor and sensory components
- sense of hearing
- sense of balance
-
IX Glossopharyngeal
- both motor and sensory components
- pharyngeal movements
- salivation
- sensation for swallow reflex
- sense of taste posterior 1/3 of tongue and portion of the soft palate
-
X Vagus
components
movements 3
function
- both motor and sensory information
- laryngeal movements,pharyngeal movements,palatal elevation
- sense of taste
-
X Vagus
3 branches
- pharyngeal branch
- superior laryngeal branch
- recurrent laryngeal branch
-
Pharyngeal branch of X Vagus
- innervates soft palate
- hypernasality if damaged
-
superior laryngeal branch of X Vagus
- cricothyroid muscles
- pitch issues if damaged
-
recurrent laryngeal branch
- muscles of abduction and adduction
- breathy voie if damaged
-
XI Accessory
components
function 4
workks in conjunction with
- motor components
- head turn, shoulder shrug
- helps elevate the palate
- helps laryngeal movements
- innervates pharyngeal muscles
- works in conjunction with the Vagus nerve
-
XII Hypoglossal
components
function
- motor components
- movements of tongue
- elevates hyoid bone
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