Spinal cord Flashcards
general spinal cord x-section
long columns of grey matter cell bodies located centrally, white matter peripheral-cell processes
longa ascending tracts
WM that heads to the thalamus, cerebellum or brainstem carry somatosensory from the periphery
long descending
UMNs from the cx and brainstem will influence LMNs in the spine
propriospinal tracts
connect different cord levels coordinate complex reflex (think cross extensor reflex)
fasciculus gracilus
primary afferents in the post funiculus caudal to T6 SS from the lower limb to the brainstem (ipsilateral)
fasciculus cutneatus
rostral to T6, primary afferents SS from the upper limb (ipsilateral) more lateral to fasciculus gracilus
anterior/lateral funiculus
ascending secondary, tertiary, and quartenary no discrete, get larger as they ascend bring somatosensory information from CONTRALATERAL SIDE (allows for contralateral awareness)
spinocerebellar tracts
located in the lateral funiculus, ascending secondary or tertiary SS neurons
corticospinal tracts
runs in the lateral funiculus descending UMNs final synapse is in the ipsilateral ventral LMNs
cerebellar peduncles
fiber tracts running from the pons to cerebellum superior, middle, and inferior
tegmentum
internal structure, located on the posterior part of the pons (part of pons, midbrain and medulla) contains the reticular formation, CN nuclei (LMN) and tracts
Rostral Medulla gross anatomy
anterior poriton is “iopen” due to the presence of the 4th ventricle
Caudal medulla gross anatomy
closed, look for amiculum of the olive
Tectum
the tectum is the roof of the midbrain. located just opposite the head of the bird, on the opposite side of the canal
Tegmuentum
reticular formation
CN nuclei (LMN’s)
Tracts, parts of medulla, pons, and midbrain
Make up anteiror part of the cerebral aqueduct
