Physiology I -Exam 2 - Neurophysiology and Sensory Organs (From Review Slides)

Question 1

What is a Motor neuron pool?

Answer 1

A group of neuronal cell bodies in the CNS that innervate a single muscle

Question 2

According to the definition, an upper motor neuron is

Answer 2

A motor neuron that lies completely in the CNS, A motor neuron that controls a lower motor neuron

Question 3

What is the function of a motor neuron pool located the medial part of spinal cord’s gray matter?

Answer 3

Innervation of axial and proximal musculature, control over musculature that maintains posture

Question 4

What is the name used to described a loss of voluntary motor coordination?

Answer 4

Ataxia

Question 5

What is the term used to describe involuntary repetitive eye movements?

Answer 5

Nystagmus

Question 6

Where is the vestibular system located?

Answer 6

Inner ear

Question 7

What type of receptor is shown in the picture Kinocilla + stereocillia present

Answer 7

Secondary receptor cell

Question 8

The receptor organ detecting rotary acceleration and deceleration of the head is located in the:

Answer 8

Ampulla of the semicircular duct

Question 9

CSF is formed at the:

Answer 9

Choroid plexus

Question 10

Obstruction of CSF flow at the cerebral aqueduct (Sylvius) would lead to dilation of the:

Answer 10

Lateral ventricles

Question 11

Which one of the following structures is not involved in reflex responses?

Answer 11

The Cerebral Cortex

Question 12

The parasympathetic nervous system (multiple answers possible):

Answer 12

Controls daily function of visceral organs,
Stimulates the intestinal motility

Question 13

Which of the following descending brainstem motor pathway controls distal limb musculature associated with skilled movement?

Answer 13

Rubrospinal tract

Question 14

How does the alpha 1 adrenergic receptor work?

Answer 14

it increases DAG and IP3

Question 15

The CSF in the third ventricle enters the fourth ventricle via

Answer 15

Cerebral aqueduct

Question 16

The muscle spindle …

Answer 16

is composed by intrafusal muscle fibers surrounded by a connective tissue capsule

Question 17

Pacinian corpuscles are rapid adapting, whereas Merkel’s corpuscles are slow adapting skin receptors

Answer 17

True

Question 18

In darkness, photoreceptors are depolarized because of the opening of cGMP-activated Na+ channels

Answer 18

True

Question 19

Motor tracts descending in the lateral white matter are:

Answer 19

excitatory to lower motor neurons for distal flexor muscles

Question 20

The adrenal medulla

Answer 20

receives only sympathetic innervation