Lesson 19 Lab
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Lesson 19 Lab
Anatomy Brain Cranial Nerves
Anatomy of the Brain and Cranial Nerves
What consists of the CNS, and what is its primary job?
brain and spinal cord, interpret incoming information and issue instructions
What consist of the PNS, and what do they do?
cranial and spinal nerves, ganglia, and sensory receptors; serve as communication lines as they carry impulses
How does the brain form?
in fetal development, two anterior outpocketings extend from the forebrain and grow fast to form the cerebral hemispheres.
What is the most superior portion of the brain?
elevated ridges of tissues
seperate gyri by shallow grooves
divides the frontal lobe from the partietal lobe
seperates the temporal lobe from the partietal lobe
on the medial surface of each hemisphere divides the occipital lobe
impulses traveling from the bodys sensory receptors are located here
where the primary motor area is located
gray matter of the cerebrum
cerebral white matter
composed of fiber tracts carrying impulses to of from the cortex
olfactory Bulbs and tracts
synapse point of cranial nerve I
cranial nerve II
where the fibers of the optic nerves partially cross over
connecting the pons below with cerebrum above
"bridge" consists primarily of motor and sensory fiber tracts connecting the brain with lower CNS centers
lowest brain stem region, composed primarily of fiber tracts
decussation of pyramids
crossover point for the major motor tracts
located on the posterior aspect of the midbrain, a brain stem structure
major commissure connecting the cerebral hemispheres, it arches above the structures of the diencephalon and roofs over the lateral ventricles.
a bandlike fiber tract concerned with olfaction as well as limbic system functions
seperates the lateral ventricles of the central hemisphere
most important basal ganglia, it is arching and comma shaped
composed of the putamen and globus pallidus nuclei
a spray of projection fibers coursing down from the precentral gyrus
a broad band of fibrous material
sometimes what the caudate nucleus and lentiform nucleus are referred to
consists of two large lobes of gray matter that laterally enclose third ventricle of the brain
connects two thalamic lobes and bridges the ventricle
tiny orifice connecting the third ventricle with the lateral ventricle on the same side
makes up the floor and the inferolateral walls of the third ventricle
what the pituritary gland hangs from, a slender stalk
in the epithalamus, a neuroendocrine structure
a slender canal traveling through the midbrain, connecting the third and fourth ventricle in the hindbrain
made of two lateral hemispheres each with three lobes
tree like braching of the cerebellar white matter
connective tissue membranes
the outer most meninx and is leathery. it is double layered
inner layer of dura mater
outermost brain covering of the dura mater and continous with spinal cord
the middle meninx, weblike,
highly vascular and delicate, clings tenaciously to the surface of the brain following its convolutions
small capillary knots hanging from the roof of the ventricles of the brain
What does cerebrospinal fliud do?
forms a watery cushon that protects the delicate brain against blows to the head.
what the CSF surculates through
: 2 branches; vestibular = assoc. with equilibrium cochlear = assoc. with hearing