Week 4

Question 1

A bundle of fibers located within the CNS is a

Answer 1

tract

Question 2

If you step on a tack the reflex that would be initiated is a

Answer 2

flexor reflex

Question 3

Inside the CNS, sensory impulses are carried in

Answer 3

ascending tracts

Question 4

Inferior to the lumbar enlargement, the spinal cord tapers to a conical portion called the

Answer 4

conus medullaris

Question 5

Spinal nerves are not part of the

Answer 5

CNS

Question 6

Which of the following lists the parts of a reflex arc in the correct sequence?

Answer 6

receptor, sensory neuron, association neuron, motor neuron, effector

Question 7

The innermost covering of the spinal cord is the

Answer 7

pia mater

Question 8

Which of the following is true concerning the meninges?

Answer 8

They cover brain and spinal cord

Question 9

The cranial meninges

Answer 9

cover the brain

Question 10

Cerebrospinal fluid

Answer 10

is produced by the choroid plexuses

Question 11

The choroid plexuses are located in the

Answer 11

ventricles of the brain

Question 12

Cerebrospinal fluid is reabsorbed by arachnoid villi into the

Answer 12

superior sagittal sinus

Question 13

The cerebrospinal fluid

Answer 13

is reabsorbed as rapidly as it is formed, about 20 mL/hr

Question 14

In a diagnostic spinal tap (lumbar puncture) of an adult, a sample of cerebrospinal fluid is removed from the

Answer 14

subarachnoid space

Question 15

The blood-brain barrier is created by tight junction seals around brain capillaries formed by the

Answer 15

astrocytes

Question 16

The basilar artery is formed by the union of the _____ arteries

Answer 16

vertebral

Question 17

The circle of Willis provides blood supply to the

Answer 17

brain

Question 18

What is the vertebral column?

Answer 18

The sections in the spine:
cervical vertebrae = 7 vertebrae
Thoracic vertebrae = 12 vertebrae
Lumbar vertebrae = 5 vertebrae
sacral vertebrae = 5 fussed vertebrae
coccygal vertebrae = 3-5 fussed vertebrae

Question 19

What are the 3 functions of CSF in the spine?

Answer 19

Mechanical protection, circulation, and homeostatic function.

Question 20

What is the spinal cord?

Answer 20

It is a bundle of nerve tissue and has the functions: to provide a two-way pathway for nerve impulses to travel between the brain and the body. And serves as the integeator, or reflex centre, for all spinal reflexes.

Question 21

What are the difference between the cranial and spinal nerves?

Answer 21

Cranial: roman numerals, 12 pairs, brain, single root
spinal: numbers eg c1-8, 31 pairs, spinal cord, two roots

Question 22

What is a nerve plexus?

Answer 22

A network of converging and diverging nerve fibres, formed by spinal nerves in cervical, lumbar, sacral region. no plexus in the thoracic region as thoracic nerves (intercostal nerves) directly supply the specific structures or organs