01_Coloring Packet

Question 1

• one axon that divides into two long processes

- usually sensory neurons

Answer 1

unipolar

Question 2

• one axon and two or more dendrites

- most common

Answer 2

multipolar

Question 3

• one axon and one dendrite
• rare
• round in retina and olfactory epithelium

Answer 3

bipolar

Question 4

3 functional types of neurons

Answer 4

• motor
• sensory
• interneurons

Question 5

Which neurons comprise more than 99% of all neurons in the body?

Answer 5

interneurons

Question 6

What do interneurons do?

Answer 6

convey impulses between sensory and motor neurons

Question 7

What increases the receptive area of the neurons?

Answer 7

dendritic spines

Question 8

In the CNS, axons are myelinated by

Answer 8

oligodendrocytes

Question 9

In the PNS, axons are myelinated by

Answer 9

Schwann cells

Question 10

What is a dermatome?

Answer 10

region of skin innervated by somatic sensory nerve fibers associated with

• single spinal level
• single dorsal root

Question 11

At the top of the head, the dermatome level begins at

Answer 11

C2

Question 12

dermatome sensation

Answer 12

pressure

pain

Question 13

How many pairs of spinal nerves does the spinal cord give rise to?

Answer 13

31

give rise to 2 major branches/rami

Question 14

dorsal ramus

Answer 14

conveys motor and sensory information to and from

• skin
• intrinsic back skeletal muscles (erector spinae, transversospinales

Question 15

ventral ramus

Answer 15

runs laterally and ventrally and innervates

- all remaining skin and skeletal muscles of the neck, limbs, trunk

Question 16

somatic nervous system

Answer 16

sensory and motor fibers to

• skin
• skeletal muscle
• joints

Question 17

autonomic nervous system

Answer 17

sensory and motor fibers to

• all smooth muscle
• cardiac muscle
• glands

Question 18

enteric nervous system

Answer 18

• plexuses and ganglia of GI tract that regulate bowel secretion, absorption and motility
• linked to ANS

Question 19

somatic nervous system: number of motor neurons

Answer 19

1

Question 20

somatic nervous system: efferent

Answer 20

• efferent neuron in CNS

- axon projects to peripheral target

Question 21

somatic nervous system: afferent

Answer 21

• neuron (pseudounipolar) in DRG

- conveys sensory info from skin, muscle, or joint

Question 22

ANS: number of motor neurons

Answer 22

2

Question 23

Where are the 2 neurons of the ANS?

Answer 23

• first neuron in CNS

- second neuron in peripheral autonomic ganglion

Question 24

ANS: axon in the first neuron (in CNS)

Answer 24

preganglionic neuron

Question 25

ANS: axin in second neuron (in peripheral autonomic ganglion)

Answer 25

postganglionic neuron

Question 26

sensory neuron type of ANS

Answer 26

pseudounipolar

Question 27

Where is the sensory neuron of the ANS?

Answer 27

DRG

Question 28

What info does the sensory neuron of the ANS carry?

Answer 28

sensory info from the viscera to CNS

Question 29

ventricle situated above the pons and rostral portion of medulla

Answer 29

4th ventricle

Question 30

ventricle situated in midline diencephalon between thalamic nuclei

Answer 30

3rd ventricle

Question 31

Where is CSF produced?

Answer 31

choroid plexus (capillary network) - in floor of lateral ventricles - in roof of 3rd and 4th ventricles

Question 32

Direction of flow of CSF within the ventricles

Answer 32

1. choroid plexus of lateral ventricles 2. third ventricle via interventricular foramen 3. fourth ventricle vis cerebral aqueduct 4. spinal canal

Question 33

secretion and absorption of CSF

Answer 33

secretion normally is matched by absorption by arachnoid granulations and small pial veins

Question 34

3 types of hydrocephalus

Answer 34

- obstructive - communicating - normal pressure

Question 35

obstructive hydrocephalus

Answer 35

congenital stenosis of either - cerebral aqueduct - interventricular foramina - lateral and median apertures may also be caused by obstructive CNS tumors that block flow

Question 36

communicating hydrocephalus

Answer 36

- obstruction outside ventricular system | - maybe due to hemorrhage in subarachnoid space or around arachnoid granulations

Question 37

normal pressure hydrocephalus

Answer 37

- adult syndrome | - results in progressive dementia, gait disorders, urinary incontinence