Lab 9 Terms and Lesson Flashcards
What is the organization of nerves?
Axons and their myelin sheaths are covered by Endoneurium. A bundle of axons covered by Endoneurium makes a fascicle which is covered Perineurium. A bundle of fascicles covered by Perineurium is covered by Epineurium to make a Spinal Nerve

Define Epineurium
Surrounds whole nerve

Define Perineurium
Surrounds each fascicle

Define Endoneurium
Covers myelinated and unmyelinated axons

What is Cranial Nerve I and what is its function and action?
- Olfactory I
- Function: Sensory
- Action: Smell

What is Cranial Nerve II and what is its function and action?
- Optic II
- Function: Sensory
- Action: Vision

What is Cranial Nerve III and what is its function and action?
- Occulomotor III
- Function: Motor
- Action: Moves eye, pupil

What is Cranial Nerve IV and what is its function and action?
- Trochlear IV
- Function: Motor
- Action: Moves eyes

What is Cranial Nerve V and what is its function and action?
- Trigeminal V
- Function: Both sensory and motor
- Action: Face sensation, chewing

What is Cranial Nerve VI and what is its function and action?
- Abducens VI
- Function: Motor
- Action: Moves eye

What is Cranial Nerve VII and what is its function and action?
- Facial VII
- Function: Both sensory and motor
- Action: Moves face, salivate

What is Cranial Nerve VIII and what is its function and action?
- Vestibulocochlear
- Function: Sensory
- Action: Hearing, balance

What is Cranial Nerve IX and what is its function and action?
- Glossopharyngeal IX
- Function: Both sensory and motor
- Action: Taste and swallow

What is Cranial Nerve X and what is its function and action?
- Vagus X
- Function: Both sensory and motor
- Heart rate, digestion

What is Cranial Nerve XI and what is its function and action?
- Accessory XI
- Function: motor
- Action: Moves head

What is Cranial Nerve XII and what is its function and action?
- Hypoglossal XII
- Function: motor
- Action: moves tongue

How do you remember the order of the cranial nerves?

How do you remember the order of the functions of the cranial nerves?

What cranial nerves do you have to remember for the sheep brain?
Cranial nerves I-VI
Olfactory I
Optic II
Occulomotor III
Trochlear IV
Trigeminal V
Abducens VI

Identify the 12 cranial nerves


What are reflexes?
- Rapid, involuntary motor responses to environmental stimuli detected by sensory receptors
- Usually protective, fast simple circuits
- Cerebral decision making not required to initiate the reflex. Aware of the reflex because sensory receptors send signals to the brain
- If unaware, likely an autonomic reflex
How does the reflex arc work?

What are the four classifications of reflexes?
- Site of integration-
- Cranial vs. spinal
- Effector involved-
- Somatic vs. autonomic
- Number of synapses
- Monosynaptic vs. polysynaptic
- Site of stimulus vs. effector
- Ipsilateral vs. contralateral vs. bilater
What is the difference between monosynaptic vs. polysynaptic
If afferent and efferent neurons are directly connecting (monosynaptic) or if afferent, interneurons, and efferent neurons are connected (polysynaptic)


















