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Cranial Nerves

Chapter 13 - A & P Lecture

QuestionAnswer
how many pairs of cranial nerves are there? 12
describe cranial nerves: Emerge directly from the brain (not the spinal cord) Are numbered using Roman numerals I–XII Are arranged anterior → posterior
what do cranial nerves do? connect the brain to: - The head and neck - And, in some cases, thoracic and abdominal organs
Functions of Cranial Nerves: Sensory (Afferent), Somatic Motor (Efferent), Parasympathetic (Autonomic)
Sensory (Afferent) Carry information to the brain Includes: General senses (touch, pain) Special senses (vision, smell, hearing, taste)
Somatic Motor (Efferent) Control skeletal muscles Example: eye movement, facial expression
Parasympathetic (Autonomic) regulate: Glands Smooth muscle Cardiac muscle 👉 These are involved in “rest and digest” functions
Purely Sensory: I – Olfactory (smell) II – Optic (vision) VIII – Vestibulocochlear (hearing & balance)
Purely Motor: IV – Trochlear VI – Abducens XI – Accessory XII – Hypoglossal
Mixed: V – Trigeminal → sensory + motor III – Oculomotor → motor + parasympathetic VII – Facial → sensory + motor + parasympathetic IX – Glossopharyngeal → all three X – Vagus → all three
I – Olfactory Function: smell Damage: loss of smell (anosmia)
II – Optic Function: vision Damage: blindness (affected side)
III – Oculomotor Function: Eye movement Eyelid elevation Pupil constriction (parasympathetic) Damage: Dilated pupil Drooping eyelid (ptosis) Eye deviates down & out Double vision
IV – Trochlear Function: moves eye (superior oblique muscle) Damage: difficulty moving eye down → double vision
V – Trigeminal Branches: V1 (ophthalmic) → forehead, eye V2 (maxillary) → upper jaw V3 (mandibular) → lower jaw + chewing Function: Sensory: face sensation Motor: chewing muscles Damage: Severe facial pain (trigeminal neuralgia) Weak chewing
VI – Abducens Function: moves eye laterally Damage: eye drifts inward → double vision
VII – Facial Function: Facial expression Taste (anterior 2/3 of tongue) Salivation & tear production Damage: Facial paralysis (Bell’s palsy) Loss of taste Decreased salivation
VIII – Vestibulocochlear Function: Hearing Balance Damage: Hearing loss Vertigo, nausea
IX – Glossopharyngeal Function: Taste (posterior 1/3 of tongue) Swallowing Salivation (parotid gland) Damage: Difficulty swallowing Loss of taste (posterior tongue)
X – Vagus Function: Sensory + motor + parasympathetic Controls: Heart rate Digestion Voice (larynx) Damage: Hoarseness Difficulty swallowing Uvula deviates away from damage
XI – Accessory Function: neck & shoulder movement Damage: difficulty turning head or elevating shoulders
XII – Hypoglossal Function: tongue movement Damage: tongue deviates toward damaged side
Cranial nerves are essential for rapid, automatic reflexes: Eye movement toward stimuli (light, sound) Tracking moving objects Protective ear reflexes (middle ear muscles) Chewing and food positioning
Cranial nerves integrate: Sensory input (what you detect) Motor output (how you respond) Autonomic control (internal regulation)
Cranial nerves allow: Facial expression Communication Survival reflexes Organ regulation
CNS disorders: Cerebral Aneurysm & Cerebral Compression
Cerebral Aneurysm Excessive dilation or ballooning of an artery; hemorrhaging (leaking) of the aneurysm leads to a hematoma within the brain or in the extradural, subdural, or subarachnoid spaces around the brain
Cerebral Compression Increased intracranial pressure; can be caused by hematomas, hydrocephalus, tumors, edema from a severe head blow, or spinal cord injury
Cranial nerve disorders: Trigeminal neuralgia &Migraine
Trigeminal neuralgia Sharp pain in the face involving the trigeminal nerve; cause is unknown; can be triggered by touch near the mouth area
Migraine Severe headache with associated sensory symptoms; cause unknown but involves the trigeminal nerve; can be triggered by environmental factors; tends to be hereditary
 

 



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