LAB 7: Nervous Tissue, Spinal Cord and Somatic Reflexes

Question 1

Where is the cell body of a sensory neuron that is bringing pain and temp info from the skin?

Answer 1

Dorsal root ganglion

Question 2

How does a sensory neurons axon enter the spinal cord?

Answer 2

Dorsal rootlets

Question 3

Where is the target for the axon of a somatic motor neuron?

Answer 3

Tissues of the skeletal muscles

Question 4

Where is the cell body of a motor neurons?

Answer 4

Ventral horn of spinal cord

Question 5

How does a motor neurons axon leave the spinal cord?

Answer 5

Ventral root

Question 6

Where are cell bodies of motor neurons that are part of the sympathetic nervous system?

Answer 6

Lateral grey horn

Question 7

What does grey matter contain?

Answer 7

Somas, dendrites, and proximal parts of the neural axons.

Site of synaptic contact (synaptic integration)

Question 8

What does white matter contain?

Answer 8

Myelin (lots), bundles of axons called tracts

Question 9

What does central canal contain?

Answer 9

Ependymal cells, CSF

Question 10

What do dorsal root ganglion contain?

Answer 10

Cell bodies of the sensory neurons

receives sensory nerve fibers- sometimes synapse with an interneuron

Question 11

What do dorsal grey horns contain?

Answer 11

Sensory information.

Grey matter that extends toward dorsolateral surfaces of cord = sensory/ependymal cells – CSF

Question 12

What do ventral grey horns contain?

Answer 12

Motor information

ependymal cells – CSF

Question 13

What is the origin and destination of the cuneate fasciculus tract?

Answer 13

O= T6 (from upper limbs and chest), D= gracile fasciculus

Question 14

What kind of information does the cuneate fasciculus tract carry?

Answer 14

Touch and proprioception

Question 15

What is the origin and destination of the gracile fasciculus tract?

Answer 15

O= midthoracic and lower parts of body, D= cuneate fasciculus

Question 16

What kind of information does the gracile fasciculus tract carry?

Answer 16

Touch and proprioception

Question 17

What is the origin and destination of the spinothalamic tract?

Answer 17

O= spinal cord, D= thalamus

Question 18

What kind of information does the spinothalamic tract carry?

Answer 18

Pain and temp

Question 19

What is the origin and destination of the spinocerebellar tract?

Answer 19

O= limbs and trunk, D= cerebellum at near of brain

Question 20

What kind of information does the spinocerebellar tract carry?

Answer 20

Proprioception

Question 21

What is the origin and destination of the corticospinal tract?

Answer 21

O= cerebral cortex, D= limbs

Question 22

What kind of information does the corticospinal tract carry?

Answer 22

Fine motor control

Question 23

What is the origin and destination of the tectospinal tract?

Answer 23

O= tectum (in midbrain), D= contralateral side of midbrain

Question 24

What kind of information does the tectospinal tract carry?

Answer 24

Reflexive movement of head and neck to sound and sight

Question 25

What is the origin and destination of the reticulospinal tracts?

Answer 25

O= reticular formation of brainstem, D= muscles in upper limbs, especially posture and balance

Question 26

What kind of information does the reticulospinal tracts carry?

Answer 26

Balance and posture, analgersia

Question 27

What is the origin and destination of the vestibulospinal tract?

Answer 27

O= brainstem vestibular nuclei, D= neurons that control extensor muscles of limbs

Question 28

What kind of information does the vestibulospinal tract carry?

Answer 28

Keeps balance and head position

Question 29

What do autonomic reflexes do?

Answer 29

Activate skeletal muscles, cardiac muscles, and glands of the body.

Question 30

What do somatic reflexes do?

Answer 30

Stimulates skeletal muscles and may act though the spinal cord or cranial nerves

Question 31

What is the function of a primary afferent?

Answer 31

Informs brain about small changes in muscle length and sudden body movements

Question 32

What is the function of a secondary afferent?

Answer 32

Signals ongoing info about the changes in muscle length (slower)

Question 33

What is the function of a gamma motor neuron?

Answer 33

Maintains tension and sensitivity of the intrafusal fibers (muscle spindles)

Question 34

What is the function of an alpha motor neuron?

Answer 34

Innervates working part of muscle/ contracts muscle (skeletal Muscles)

Question 35

What are stretch reflexes important postural reflexes because why?

Answer 35

They act to maintain posture, balance, locomotion and equilibrium

Question 36

When testing the patellar reflex, what muscle is hammed, what muscle contracts, and what type of movement is at what joint?

Answer 36

H- Quardireps femoris muscle, C- Quadriceps femoris, type of M- Extension of the knee

Question 37

When testing the biceps reflex, what muscle is hammed, what muscle contracts, and what type of movement is at what joint?

Answer 37

H- Biceps brachii, C- Biceps brachii, Type of M- flexion of the elbow

Question 38

When testing the triceps reflex, what muscle is hammed, what muscle contracts, and what type of movement is at what joint?

Answer 38

H- Triceps brachii, C- triceps brachii, Type of M- Extension of elbow

Question 39

When testing the Achilles reflex, what muscle is hammed, what muscle contracts, and what type of movement is at what joint?

Answer 39

H- Gastronemius soleus, C- Gastronemius, Type of M- Plantar flexion of the ankle