neuroanatomy 4 Flashcards
CN I modality
purely sensory
CN III
motor + para symp
trigemnial nerve (V) function
somatosensation of face, proprioception associated with chewing, motor control (muscles of mastication, tensor tympani, mylohyoid, ant belly of digastric, tensor veli palatini)
name the trigeminal sensory nuclei
mesencephalic nucleus (proprioception info from chewing muscles), pontine trigeminal nucelus (discriminitve touch, vibration), spinal nucleus (pain +temp). they form a long column of neurons that stretch from midbrain to upper 2 segments of cervical spine
what is unusual about the mesencephalic nucleus
only site in the CNS where the cell bodies of the primary afferent neurons live inside the CNS. it is a retained sensory ganglion
in the ventral trigeminal tract where do most fibres cross
midline, but some dont which mean bilateral representation of vibration, touch in cortex
what is the only CN to exit posteriorly
trochlear
where does the abducens exit
caudal pons
where does hypoglossal exit
medulla
why do 3,4,6,12 emerge close to the midline
reflects the location of their nuclei
what CN nerves share the solitary nucleus + where is it
7,9,10. upper and lower medulla
which CN nerves share the sup and inf salivatory nuclei
7,9.
which CN nerves share the nucleus ambiguus + where is it
9,10. lower pons/upper medulla
what is the corticobulbar tract
part of the pyramidal tract that is motor to cranial nerves
what does the facial nerve do
motor - muscles of facial expression
para innervation to pterygopalatine and submandibular ganglia
taste (ant 2/3 tongue via c.tympani)
what does glosso do
tactile sense, pain, temp from the post tongue pharangotympanic tube and upper pharynx
motor - one muscle - stylopharyngeus
what does vagus do
tactile sense, pain, temp from pharynx, larynx, trachea, oesophagus, thoracic and abdominal viscera
taste (epiglottis)
para to ganglia serving thoracic and abdo viscera
motor - striated muscle of pharynx and larynx
