Monday 1 - robins - intro to cranial nerves and half of NSAIDS (oops) Flashcards
How many pairs of spinal nerves are there? cranial nerves?
spinal: 31
cranial: 12
these are PAIRS
Where does the trochlear nerves come off of on the brain?
dorsal surface right next the the _________ idk
What kind of nuclei are in the sulcas limitans?
visceral motor and visceral sensory
Two general sensory tracts in the brain:
one responsible for fine touch, vibration and proprioceptive sensation
one responsible for transmitting pain and temperature information
Dorsal column/medial lemniscal tract (made of gracile fasciculus and cuneate fasciculus)
anteriolateral tract (lateral spinothalamic tract and anterior spinothalamic tract) (STT)
cranial nerve signs on one side, coupled with long tract signs on the opposite side is the hallmark of what
a brainstem lesion
General function of the reticular formation
packing material around cranial nerves, nuclei control arousal, respiration, swallowing, heart reate, BP.
Medial lemniscus
Right after the 1st synapse of affarent nerves at either the fasciculus gracilis or fasciculus cuneatus, second order neurons cross hemispheres and ride this lemniscus up.
Ventral posterior lateral nucleus of the thalmus serves what?
Ventral posterior medial nucleus serves what?
lateral = body
medial = face
Cell bodies of primary sensory neurons are usually lacated in the periphery and do not cross the midline, what is the exception
cranial nerve V that has cell bodies in the CNS, mesencephalic nucleus.
Where in the CNS does the first synapse happen in a tactile receptor pathway
in the caudal medulla
Lesions in the medial lemniscus produce what?
contralateral sensory defects.
What is receptive field overlap?
When the receptive fields or second order neurons overlap, i.e. stimulating one spot on the skin can stimulate multiple second order neurons.
Lesions in the ventral posterio-lateral thalmus result in what?
difficulty localizing pain
What is the central lateral nucleus of the thalmus involved in?
What happens if there is a lesion in this area
Alternative thalamic relay, which is just general pain and suffering.
Lesions alleviate general pain and suffering, or you could just stop breathing.
Brown sequard syndrome
aka hemiplegia
loss of sensation and motor function due to a lateral hemisection of the spinal cord
