Lecture 8 - The Central Nervous System: Ventricles and Cranial Nerves

spinal cord segmental organization

cervical (8)

thoracic (12)

lumbar (5)

sacral (5)

30-31 pairs of spinal nerves

True or False

The dorsal root ganglia (DRG) contain cell bodies of both sensory & motor neurons that send their fibers in spinal nerves

False

only contains sensory neurons

which statement is correct about spinal cords?

A. sensory afferent fibers arrive into spinal cord through dorsal root of spinal nerves

B. sensory efferent fibers exit spinal cord through ventral root of spinal nerves

C. motor afferent fibers arrive into spinal cord through dorsal root of spinal nerves

d. sensory efferent fibers arrive into brain through dorsal root of spinal nerves

e. motor efferent fibers exit brain through dorsal root of spinal nerves

A. sensory afferent fibers arrive into spinal cord through dorsal root of spinal nerves

white matter tracts associated w/ ....

sensory & motor function

reticulospinal tract in spinal cord carries

a. sensory info & is found in anterior white matter of spinal cord

b. motor info & is found in gray matter of spinal cord

c. motor info & is found in anterior white matter of spinal cord

d. sensory info is found in posterior white matter of spinal cord

c. motor info & is found in anterior white matter of spinal cord

arachnoid

refers to spider web like appearance of blood vessels within this space

dura

- like scalp, is supplied both cranial & cervical spinal nerves

- brain itself is normally insensitive to painful stimuli & headaches are commonly either of vascular (intracranial or extracranial) or dural origin

which meningeal layer is closest proximity w/ parenchyma (functional tissue) of brain

a. dura mater

b. arachnoid mater

c. epidural space

d. pia mater

e. subarachnoid space

d. pia mater

ventricular system

internal cavities of brain & spinal cord

the foramen of monro connects ventricles

a. lateral ventricles w/ 3rd ventricle

b. lateral ventricles w/ fourth ventricle

c. third w/ fourth ventricle

d. fourth ventricle w/ spinal canal

a. lateral ventricles w/ 3rd ventricle

which ventricular system structure/embryological division pair is correct

a. lateral ventricles ; diencephalon

b. 3rd ventricle ; telencephalon

c. cerebral aqueduct; mesencephalon

d. 4th ventricle; myelencephalon

c. cerebral aqueduct; mesencephalon

choroid plexus produces

cerebrospinal fluid (CSF)

- btwn arachnoid & pia mater & protects brain from trauma

choroid plexus

- consists of modified ependymal cells

- found in all ventricles

Which statement about ventricular system is incorrect

a. connected w/ spinal canal of spinal cord

b. continuous network that contains CSF made by choroid plexus tissue found lining the ventricular system

c. contains water only

d. helps buffer a blow to brain

c. contains water only

True or false

the 12 cranial nerves are encased in bone ; therefore are part of CNS

false

- only cranial nerves l & ll are part of CNS ; other 10 cranial nerves are part of PNS

which cranial nerve is associated w/ somatic motor function in facial muscles & with taste sensation

a. oculomotor [CN lll]

b. vagal [CN, x]

c. trigeminal [Cn V]

d. optic [CN ll]

e. facial [CN Vll]

e. facial [CN Vll]