Lecture 28: Somatic Sensory Nervous System

Question 1

Somatic = ?

Answer 1

• Voluntary

Question 2

Autonomic = ?

Answer 2

• Involuntary

Question 3

Somatic effectors = _____ muscle.

Answer 3

• Skeletal

Question 4

Autonomic effectors = what type of muscles?

Answer 4

• Smooth, Cardiac

Question 5

Where is the cell body located in sensory neurons?

Answer 5

• In the root ganglia

Question 6

Sensory receptors are ____. This is separate from the neurons that bring information in to the CNS. These are highly _____ to a ______ stimulus.

Answer 6

• Specialised
• Sensitive
• Particular

Question 7

What 4 types of information describe a sensory stimulus:

Answer 7

• Modality
  Type of sensory receptor activated
• Intensity
  Frequency of action potential firing in afferent neuron
• Duration
  Duration of action potential firing in afferent neuron
• Location
  Location of sensory receptor(s) activated, ‘mapped’ in brain

Question 8

Where are the length receptors?

Answer 8

• In the muscle spindles

Question 9

Where are the tension receptors?

Answer 9

• In the tendons

Question 10

What are some examples of touch modality?

Answer 10

• Receptors at the end of hair bulb

Question 11

Stimulus location?

Answer 11

• Receptive field
• Neuron 1 = 1
• Neuron 2 = Area 2
• Neuron 3 = Area 3

Question 12

For touch and posture information travels via which pathway? How many neurons are in the relay?

Answer 12

• Medial Lemniscal (Dorsal Column) Pathway

- Three

Question 13

Areas of cortex respond to areas of _____. Densely innervated areas

Answer 13

• Body

Question 14

Pain is sensed by free nerve endings. Fast pain has a _____ receptive field whereas slow pain has a _____ receptive field.

Answer 14

• Small

- Large

Question 15

The afferent pathway for pain is called the…

Answer 15

• Lateral spinothalamic pathway

- Across and up