nervous system test Flashcards
the largest functional region of the brain; the convoluted mass that lies superior to all the other parts of the brain.
- in charge of conscious thought, memory, learning
- receives and interprets senses and initiates motor responses
cerebrum
blue layer on eye that allows light to be taken and let animals see in the dark
tapetum lucidum
order of impulse to brain
nerve, chiasma, Tract, thalamus, cerebral cortex
the innermost of the three meninges surrounding the brain and spinal cord
-thin and delicate; doesn’t interrupt brain and protects spine
pia mater
image on retina vs image on cortex
retina-upside down
Cortex-flips it for u
the transparent anterior portion of the fibrous tunic covering the eye
-controls and focuses entry of light into he eye, protective outer layer
cornea
a mass of gelatinous material located within the eyeball in the posterior cavity located between the lens and retina
vitreous humor
a clear fluid produced as a filtrate from blood in the choroid plexus of the brain. it circulates through the ventricles of the brain, the central canal of the spinal cord and the subarachnoid space of the brain and spine
-shock absorbing liquid cushion and transports vital materials
cerebrospinal fluid
A white segmented insulative cover over the axons of many peripheral neurons that is produced by Schwann cells.
-insulating layer that allows electrical impulses transmit quickly and effectively along nerve cells
myelin sheath
a functional region of the hindbrain located inferior to the cerebrum
-carries sensory info from sens. organs and muscles joints and inner ear to the brain to determine motor activ.,equilibrium, and balance
cerebellum
the outer of the three meninges that surround the brain and spinal cord
-tough think sheath around spine
dura mater
the area on the retina where the optic nerve exits the eye; contains no rod or cone cells
also called blind spot
-no image detection here
optic disk
a photoreceptive cell in the retina of the eye that detects very low levels of light
- sensitive to small amounts of light
- respond by initiating a signal
rod cells
A photoreceptor in the retina of the eye that is involved in color vision and high visual activity
- color sensitive
- respond to light by initiating a signal
cone cells
nerve cells that transmit sensory information (sight, sound, feeling, etc.). They are activated by sensory input, and send projections to other elements of the nervous system, ultimately conveying sensory information to the brain or spinal cord (CNS)
sensory neurons
the point at which the two optic nerves cross on the central aspect of the brain
-where nerves travel to get to the tract
optic chiasm
sharpness or clarity of a particular sensation
accuity
a bilobed endocrine glad located in the anterior neck region that produces hormones influencing growth and metabolism and calcium levels in the blood
-contains clusters of neuron cell bodies=relay systems for sensory impulses on their way to cerebrum and motor going out
thalamus
order of light to eye
cornea,aq humor, pupil, lens, vitreous humor, retina
CNS vs PNS
CNS-brain and spine
PNS-somatic and automatic
the watery fluid that fills the anterior compartment of the eye
-supports shape of eye, removes waste, supples nutrients to parts of the eye without blood supply
aqueous humor
the middle of three connective tissues of the brain and spinal cord
-surrounds and protects spine
arachnoid mater
the three membranes conceding the brain and spinal cord
-several layers that protect spine from physical injury
meninges
later of adipose tissue surrounding and cushioning eye
-protect eye and keep structure/shape
eye fat tissue
arc order
stimulus sensory receptor afferent CNS (can have interneuron) efferent effector
the light sensitive inner layer of the eye that contains rod and cone cells
-forms inner lining of posterior eye, detects light and transports nerve impulses to optic nerve
retina
One of the two inferior highly muscular chambers of the heart that push blood into major arteries during their contraction
- filters blood plasma
- responsible for production, transport, and removal of cerebrospinal fluid
ventricles
