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IMF-081-02-0001-en	Why can a small brainstem lesion produce crossed findings?	It damages cranial-nerve nuclei or fascicles on its own side while also interrupting long tracts that serve the opposite side of the body.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0002-en	Why do sensory cranial nuclei lie lateral to motor nuclei in the brainstem floor?	Opening of the fourth ventricle displaces the alar sensory nuclei laterally while the basal motor nuclei remain medial.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0003-en	What makes the mesencephalic trigeminal nucleus unusual among sensory systems?	It contains the cell bodies of primary sensory neurons for jaw proprioception inside the central nervous system rather than in a peripheral ganglion.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0004-en	How does a lateral brainstem lesion produce ipsilateral facial but contralateral body pain-temperature loss?	It damages the uncrossed spinal trigeminal system for the same side of the face and the already crossed spinothalamic tract for the opposite body.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0005-en	Why does a trochlear nuclear lesion affect the contralateral superior oblique, whereas a trochlear nerve lesion affects the ipsilateral one?	Trochlear fibres decussate before exiting dorsally, so the nucleus serves the opposite eye while the nerve beyond the crossing serves its own side.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0006-en	Why does an abducens nuclear lesion cause a horizontal gaze palsy, while a fascicular lesion causes only abduction weakness?	The nucleus also holds interneurons projecting via the medial longitudinal fasciculus to contralateral medial-rectus neurons; the fascicle carries only lateral rectus motor axons.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0007-en	What produces internuclear ophthalmoplegia, and how does it present?	A lesion of the medial longitudinal fasciculus, which links the ocular nuclei, impairs adduction and causes nystagmus of the abducting eye.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0008-en	Why is the pupil more often affected by aneurysmal compression of the oculomotor nerve than by microvascular injury?	Pupil fibres run superficially in the nerve, where compression reaches them, while microvascular fascicular injury can sometimes spare them; this is a tendency, not a rule.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0009-en	Why can persistent hiccup, vomiting or autonomic instability localise to the medulla?	The area postrema detects blood-borne emetic signals, and the solitary nucleus and vagal pathways coordinate vomiting and visceral reflexes there.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0010-en	Why do unilateral brainstem lesions rarely cause complete deafness in one ear?	Beyond the cochlear nuclei, auditory fibres project bilaterally through the superior olivary complex and higher relays, so each ear is represented on both sides.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0011-en	How do mossy fibres and climbing fibres differ in their route to Purkinje cells?	Mossy fibres excite granule cells whose parallel fibres contact Purkinje cells; climbing fibres from the inferior olive strongly excite Purkinje cells directly and convey error signals.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0012-en	How do vermis and hemispheric cerebellar lesions differ, and why are limb signs ipsilateral?	Vermis lesions cause truncal and gait ataxia; hemispheric lesions cause limb dysmetria and intention tremor on the same side, because cerebellar pathways cross twice or not at all.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0013-en	Why can a small upper-brainstem lesion impair consciousness when a unilateral cortical lesion usually does not?	Consciousness needs both hemispheres and the ascending arousal system; a strategic brainstem lesion cuts that system, while one hemisphere's loss leaves the other functioning.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending
IMF-081-02-0014-en	How does the anatomy of lateral medullary syndrome explain its combination of signs?	Damage to vestibular nuclei, inferior cerebellar peduncle, nucleus ambiguus, spinal trigeminal, spinothalamic and sympathetic fibres gives vertigo, ipsilateral ataxia, dysphagia, hoarseness and Horner syndrome.	Integrated Medical Foundations; chapter 81, TTS module 2; https://theisegoria.github.io/medical-textbook/integrated-medical-foundations-expanded-english.md; module SHA256 at export: 163da7d2577d82fecd21c8cf923a97b9d76fa6ec88ea95d629661fd80c008c33; editorial review pending	imf lang::en chapter::081 module::081-02 review::pending