41) The projections of gray matter extending through the white : 1200517

41) The projections of gray matter extending through the white : 1200517.


41) The projections of gray matter extending through the white matter toward the outer surface of the spinal cord are called

A) wings.

B) horns.

C) pyramids.

D) fibers.

E) tracts.

42) Axons that cross from one side of the spinal cord to the other are found in the ________.

A) anterior white columns

B) lateral gray horns

C) posterior gray horns

D) gray commissures

E) posterior white columns

43) Enlargements of the spinal cord occur

A) near the posterior median sulcus.

B) adjacent to the anterior median fissure.

C) in the cervical and lumbar regions.

D) in the thoracic region of the spinal cord.

E) in the cervical and thoracic regions.

44) The entire spinal cord is divided into ________ segments.

A) 5

B) 12

C) 25

D) 31

E) 35

45) The gray matter of the spinal cord is dominated by

A) tracts.

B) columns.

C) meninges.

D) cell bodies of neurons and glial cells.

E) blood vessels.

46) In adults, the spinal cord usually extends to which level?

A) tenth thoracic vertebra

B) first sacral vertebra

C) seventh cervical vertebra

D) fourth or fifth lumbar vertebra

E) first or second lumbar vertebra

47) Which spinal cord structure(s) contains the axons of CNS motor neurons that control muscles and glands?

A) anterior gray commissure

B) white column

C) ventral roots

D) dorsal roots

E) ventral horns

48) The posterior horns of the spinal cord contain

A) sensory nuclei.

B) somatic motor nuclei.

C) autonomic motor nuclei.

D) nerve tracts.

E) visceral motor axons.

49) If the dorsal root of a spinal nerve is severed,

A) motor control of skeletal muscles would be impaired.

B) motor control of visceral organs would be impaired.

C) the spinal cord would not be able to process information at that level.

D) the brain would not be able to communicate with that level of the spinal cord.

E) incoming sensory information would be disrupted.

50) The midbrain has a slender CSF-filled canal known as the ________.

A) cerebral aqueduct

B) lateral ventricle

C) medulla oblongata

D) fourth ventricle

E) third ventricle



41) The projections of gray matter extending through the white : 1200517

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