Peripheral nervous system

What are the two divisions of the PN system?

Sensory and motor

What are the subdivisions of the PNS?

Somatic and visceral

In the sensory division what does somatic control?

stuff your consciously aware of (5 senses and balance perception)

In the sensory division what does visceral control?

stuff you are not normally aware of (stretch and blood chemistry)

In the motor division, what does somatic control?

stuff you consciously control (skeletal muscle)

In the motor division what does visceral control?

stuff you don’t consciously control (heart, smooth muscle, glands)

what does the sympathetic nervous system control?

fight vs. flight

What does the parasynthetic nervous system control?

rest and digest

What are the two types of nervous in the peripheral nervous system?

Cranial and spinal

How many cranial nerves are there?

12

What is cranial nerve 1 called and control?

Olfactory- smell

What is cranial nerve 2 called and control?

Optic-vision

What is cranial nerve 3 called and control?

Oculomotor- most eye muscle

What is cranial nerve 4 called and control?

Trochlear- l eye muscle

What is cranial nerve 5 called and control?

Trigeminal- Jaw muscles and somatosensation

What is cranial nerve 6 called and control?

Abducens- 1 eye muscle

What is cranial nerve 7 called and control?

Facial- facial muscles, glands of face, taste

What is cranial nerve 8 called and control?

Vestibulocochlear- hearing and balance

What is cranial nerve 9 called and control?

Glossopharyngeal- Swallowing muscles, taste, viscerosensation

What is cranial nerve 10 called and control?

Vagus- voice box muscle, most parasynthetic axons for the autonomic nervous system, taste, viscerosensation

What is cranial nerve 11 called and control?

Spinal accessory- muscles of the neck/ shoulders

What is cranial nerve 12 called and control?

hypoglossal- tongue

What does the phrenic nerve innervate (supply)?

Diaphragm- main muscle for breathing

What is referred pain?

Pain that feels like it’s coming from one place but is actually from somewhere else.

How does referred pain happen?

Sensory information picked up by a visceral neuron is sent to 2nd order somatic sensory neurons in the spinal cord.

What is a receptive feild?

Area of the body where sensory somatic stimuli are picked up by the sensory receptors of a particular sensory neuron.

Bigger receptive field =?

Worse sensation (harder to tell stimuli apart)

What is proprioception?

The ability of the body to sense movement and position.

Detecting joint position (sensory nerve detecting stretch in joint walls).

Muscle contraction (muscle spindles and Golgi tendons organs).

What is the neuromuscular junction?

Acts like a synapse between motor neuron and skeletal muscle.

What is the transmitter in the neuromuscular junction?

acetylcholine

What is the receptor in the neuromuscular junction?

nicotinic acetylcholine receptor