7.5 Spinal Cord And Nerves

Question 1

Neurons come into the spinal cord from

Answer 1

The back (dorsal) bringing info

Question 2

How many spinal nerves

Answer 2

31

Question 3

Neurons leave the spinal cord from

Answer 3

front / ventral

Question 4

Nerve plexus

Answer 4

Interchange of nerve bundle freeway

Question 5

Name the nerve plexuses

Answer 5

Cervical- (C3-5) phrenic nerve (diaphragm)
Brachial (C5-T1)
Lumbar (L1-4)
Sacral (L4-S4) - sciatic and glute nerves

Question 6

Cauda equina

Answer 6

Horsetail of nerves coming down from end of spinal cord

Question 7

Five steps of spinal reflex

Answer 7

1. Stretching stimulates sensory receptors /proprioceptors
2. Sensory neuron takes info to CNS brain
3. Within integration center (Grey matter of spinal cord), sensory neuron activated motor neuron
4. Motor neuron sends info to muscle fiber
5. Effector (quadriceps femoris) contracts and relieved the stretching. Muscle fiber contracts