lecture 7 Flashcards
What does spinal cord carry, as part of function?
carry sensory information from skin/internal organs to brain
Carry motor commands from brain to motor neuron
What does the spinal cord integrate
they integrate sensory information with descending motor commands.
What affect does the spinal cord have on the limbs?
Spinal cord allow coordinated and rhythmic contractions of the limb muscles
What does the spinal cord operate?
it operates the spinal reflexes muscle contraction and motor patterns?
What are spinal reflexes important for?
Posture, movement and protection
What does the spinal cord have autonomic control over?
major organs
Which part of the spinal cord is the grey matter?
the inner part of the spinal cord
what does the grey matter of the spinal cord carry?
neurons , interneurons and their connections
what part of the spinal cord is white matter?
the outer part of the spinal cord
what does the white matter of the spinal cord carry?
fibre tract
what does the dendrites do?
the receive synaptic input
what does the motor axon do?
travels in the peripheral nerve to the skeletal muscle
Name the two principal motor pathways of the spinal cord
ipsilateral - neurons are on the same side
controlateral - neurons are opposite sides
what does the corticospinal tract do?
controls fine moevment
what does the rubrospinal tract do?
controls voluntary movment
name a sensory tract in the spinal cord
the spinothalamic tract
what does the spinothalamic tract do?
responsible for the transmission of pain and temperature and course touch from the body (via the spinal ganlion) and the face (via trigeminal ganlion) to the somatosensory region of the thalamus
what is the dorsal-column lemniscal pathway.
sensory pathway of the spinal cord that conveys information of fine touch and joint sensation from the face and body
what does the pelvic nerve contain (involving micturition)
contains the sensory afferent from bladder/sphincter and parasympathetic fibres to internal sphincter
what does the hypogastric nerve contain (involving micturition)
contain sympathetic fibres from L2 to blabber and internal sphincter
what does the pudendal nerve do
controls the voluntary pathway from brain to lower spinal cord (for micturition)
what receptors is the bladder filling detected by
the stretch receptors in the bladders, sphincters and ureter
what affect does the bladder filling have?
causes firing of afferents in pelvic nerve to brainstem and spinal cord
what does the sympathetic efferent do when the bladder is filling?
inhibit urination by decreasing excitability of smooth muscle in bladder and increasing excitability of the internal sphincters
when does the parasympathetic efferent get involved in the process of urination
when pressure rises in the bladder
what does the parasympathetic efferents do, during process of urination?
they stimulate bladder smooth muscle and relax the internal sphincter
what control is bladder emptying under?
it is under voluntary control in the corticospinal pathway
what does the corticospinal pathway do, in process of urination
provides tonic control of the external sphincter
what happens when urination takes place
voluntary system relaxes external sphincter, inhibits sympathetic efferents and stimulates the parasympathetic efferents
