spinal cord Flashcards
start of the spinal cord
Atlanto occipital joint / foramen magnum
end of spinal cord
Lumbar puncture in adult
Lumbar puncture in children
L1/L2
L3/L4
L4/L5
CONUS MEDULLARIS
Epidural space of spinal cord contains
venous plexus of batson
fibers carrying pain, touch & temperature synapse at the
substantia gelatinosa
sense of movement, vibration, position, 2 point discrimination originate from
nucleus proprius
stretch reflex
fibers for formation of muscle spindles (C8-L4 Clareke’s) synapse at
Nucleus dorsalis
alpha motor neurons
y- motor neurons
for muscle
from muscle spindles
C3-C5
C1-C5
Diaphragm
accessory nerve (trapezius+sternocleidomastoid)
Corticospinal tract
Spinothalamic tract
motor (descending)
sensory {pain, touch, temp.
dorsal column
medial lenniscus pathway
Fasciculus cuneatus - carry upper limb fibers
Fasciculus gracillis- carry lower limb fibers
carries conscious proprioreception
primary somatosensory cortex is
post central gyrus
3 MAJOR TRACTS
Cervicospinal
dorsal column
Spinnothalamic
check google for image
3 branches of Exeteroceptive of the afferent/descending tract
Lateral spinothalamic (pain & temp.)
ANterioir spinothalamic (touch, pressure )
3 Branches of proprioceptive of the afferent/descending tract
F. cuneatus
F. Gracillis
Ingerorecptive tract OF Ascending/sensory
Orginate from internal receptors (Autonomicn NS)
Ascending descedning is divides into 2
Pyramidal
Extrapyrimidal
Pyramidal ( conscious ) is divided to 2
Corticopinal- (lateral, anterioir muscles below the neck )
Corticobulbar- nuclear (cortex~brainstem)
for movement of head, neck in CNS
EXtraopyramidal are divided into
Rubrospinal ( muscle tone )
Vestibulospinal (antigravity)
Reticulospinal ( muscl tone )
Tectopinal
all sensory pathways go to thalamus ( except olfactory) then to the sensory cortex
post central gyrus, parietal lobe
receptors of medial lemniscus pathway
muscle spondles, golgi tendon organs, pacinian and meseiners tactile receptors, joint receptors
in 2nd order neurons medial meniscus deccusates & ascends though ______ and terminates at________
controlateral brainstem
ventral posterolateral nucleus of thymus
above the sensory decussation transection would cause loss of sensation in
controlater dorsal column modalities
transection in the spinal cord leads to loss of
ipsilateral dorsal colum modalities
nucleus that receives muscle and tendon afferents and whose axons form spinocerebellar tract
nucleus dorsalis of calrke ( C8-L2)
