Spinal Cord

Question 1

afferent

Answer 1

“A”scending Up

Sensory

Question 2

Efferent

Answer 2

Desending down

Motor

Question 3

Spinal Cord’s vertebrae

Answer 3

surrounded by 33 vertebrae

• 7 cervical
• 12 Thoracic
• 5 Lumbar
• 5 Sacral
• 4 fused vertebrae in Coccyx

Question 4

Spinothalamic tract

Answer 4

Originates in SC, goes to thalamus

Pain, Temp, Sensation

Question 5

Posterior grey horn

Answer 5

Sensory

grey matter

Question 6

Anterior grey horn

Answer 6

Motor

grey Matter

Question 7

Upper and Lower Motor Neurons

Answer 7

Upper in brain and spinal cord activates lower motor neurons which are the periphery
even though lower originate in CNS also

Question 8

Spinothalamic Tract

Answer 8

Originates in spine, to thalamus

Pain, Temp, Sensation

Question 9

Upper Motor Neurons

Answer 9

in brain and spine, activate lower motor neurons
Carry impulses from cerebral cortex to anterior gray column of spinal cord
damage results in:
Increased muscle tone, 
Decreased muscle strength
decreased coordination
hyperactive reflexes
spastic paralysis

Question 10

Lower Motor neurons

Answer 10

Have direct influence on muscles
Cell bodies originate in grey matter of spinal cord but axons extend into the PNS
Destruction leads to permanent paralysis

Question 11

Peripheral Nervous System

Answer 11

Links CNS and body
Responsible for receiving and transmitting info from and about environment
Composed of nerves, ganglia and sensory receptors outside of CNS
Divided into sensory (afferent) and motor (efferent)