dura mater
outer layer of the meninges
arachnoid mater
web like layer, lacks blood vessels and nerves. lies between the dura mater and innermost layer of the pia mater
pia mater
adheres tightly to the outer surface of the brain and spinal cord and provides the brain and spinal cord with many blood vessels and nerves
falx cerebelli is a
sickle shaped extension that separates the two halves or hemispheres of the cerebellum
tentorium cerebelli
separates the cerebellum from the cerebrum
epidural space
contains a supporting cushion of fat and other connective tissue and also contains nerves and blood vessels
subdural space
contains a small amount of lubricating fluid and lies between the dura mater and the arachnoid mater
subarachnoid space
space contains a large amount of cerebrospinal fluid
cerebrospinal fluid does what
cushions
reservoir of circulating fluid
homeostatic functions
choroid plexus
CSF separates here
each choroid plexus is covered with a sheet of specialized type of
ependymal (glial) cell
ependymal (glial) cell does what
releases the cerebral spinal fluid into the fluid spaces
nerve roots project from each side of the
spinal cord
dorsal (posterior nerve root) does what
carry information into the spinal cord
ventral (anterior) nerve root
carry motor information out of the spinal cord
the spinal cord provides
conduction routes to and from the brain, integrator or reflex center for all spinal reflexes
ascending tracts conduct
sensory impulses up the cord of the brain
descending tracts conduct
motor impulses down the cord fem the brain
medulla oblongata, pons, and midbrain are collectively called the
brainstem
medulla oblongata
composed of white matter and a network of gray and white matter
medulla oblongata function is
respiratory, vasomotor control center, cardiac
called the vita center
pons
serves as a message station between several areas of the brain. It helps relay messages from the cortex and the cerebellum. Without the pons, the brain would not be able to function because messages would not be able to be transmitted, or passed along. It also plays a key role in sleep and dreaming, where REM sleep, or the sleeping state where dreaming is most likely to occur, has been proven to originate here, in the pons.
midbrain
integration of numerous cranial nerves reflexes , such as eye movements, papillary reflex, ear reflexes
reticular formation
state of consciousness
cerebellum
planning and coordination of carol of skilled movements, posture , balance, coordination of sensory information relating to the body position and movement
thalamus
crude sensation, coordination of sensory information relayed to cerebrum , involved in emotional response to sensory information, involved in arousal , general processing of information to /from brain
hypothalamus
integration/coordination of many autonomic reflexes, hormonal function , involved in arousal, appetite, thermoregulation
pineal gland
produces melatonin a timekeeping hormone as part of the bodys biological clock
cerebrum
complex processing of sensory and motor information complex integrative functions
cerebral cortex
higher level processing of sensory and motor information including conscious sensation and motor control complex integrative functions such as consciousness, language , memory , emotions
cerebral tracts
conduction information between CNS areas to facilitate complex processing and integration
basal nuclei
integration and regulation of conscious motor control especially posture , walking, other repetitive movements possible roles in thinking and learning
the inner protective covering of the brain is called the
meninges
the large fluid filled spaces within the brain are called the
ventricles
formation of the CSF occurs in the
choroid plexus
spinal cord tracts provide conduction paths to and from the brain . the tracts that conduct sensory impulses down the cord from the brain are called ____ tracts
descending
the three divisions of the brain that make up the brainstem are the
medulla oblongata, thalamus, midbrain
the second largest part of the brain, located just below the posterior portion of the cerebrum is the
cerebellum
what consists of several structures that lie beneath the thalamus
hypothalamus
the reticular activating system maintains
consciousness
the limbic system integrates
emotion
the cortex is capable of storing and retrieving information from both short term and long term
memory
the set of coordinated commands that control the programmed muscle activity mediated by extrapyramidal pathways is called the
motor program
the cerebellum performs what functions
coordinates muscle control of muscle action, helps control posture, controls skeletal muscles to maintain balance
impulses from which system play a part in arousing or alerting the cerebrum
reticular activating system
CSF circulates through the ventricles and is eventually reabsorbed by the
venous sinsuses
a person who is awake, alert and busy would have a predominance of brain waves
beta
the part of the brain that can directly influence or inhibit the release of hormones form the pituitary is the
hypothalamus
the flax cerebella separates the
two hemispheres of the cerebellum
vomiting reflex is mediated by the
medulla
there are ___ ventricles in the brain
4
when someone close to you dies, you feel a sense of sorrow among other emotions your ability to experience emotions is the result of
limbic system
the layer of the meninges least likely to be involved in meningitis is the
dura mater
the film terminal is part of the
meninges
the cerebrospinal fluid is formed by separation of fluid from the blood in the
choroid plexus
the brainstem includes
pons, medulla, midbrain
the bodes biological close is controlled by the
pineal body
innermost layer of the meninges is the
pia mater
the white mater of the cerebellum is called the
arbor vitae
the dorsal root ganglia of the spinal nerve were destroyed a person would lose
sensory perception related to that pathway
CSF is found in
subdural space, third ventricle, central canal
several vital centers are located in the
medulla
the cerebellum acts with the _____ to produce skilled movement
cerebrum
which part of the brain releases the hormone melatonin
pineal gland
which of the following would not be an effecter of the autonomic nervous system
skeletal muscle
what might occur from the stimulation of parasympathetic fibers
increased peristalsis in the digestive tract
what cranial nerve is responsible for movements of the tongue
hypoglossal
small branches fro mthe cervical plexus join which two cranial nerves
hypoglossal and accessory
what are characteristics of the sympathetic preganglionic nerurons
they secret ACTH, the pass through the sympathetic trunk, they have long fivers from the CNS to ganglion
parasympathetic preganglionic neuron cell bodies are located in the
nuclei of the brainstem and the lateral gray columns of the sacral cord
what is not true of the parasympathetic postganglionic neurons
they produce norepinephrine as a neurotransmitter
what is associated with ocular movement
eye movement, regulating the size of the pupil, propriception of the eye
what is not true about the sympathetic postganglionic neurons
they produce ACTH
the nerve called the vagus nerve is the
tenth cranial nerve
somatic reflexes consists of
contractions of the skeletal muscles
nerves that innervate the floor of the pelvic cavity and some of the surrounding areas are found in the
coccygeal plexus
what region of the spinal cord contribute nerves to a plexus
cervical , thoracic , lumbar
the caudal equine is
the nerves below the ending of the spinal cord
the phrenic nerve is found in the
cervical plexus
norepinephrine is liberated at
most sympathetic postganglionic nerve endings
what is true about spinal nerves
they are motor and sensory fibers
afferent nerves or fivers are found in the
only in the sensory nervous system and autonomic nervous system
the cervical plexus is
found deep in the neck
the sympathetic responses generally have widespread effects on the body because
preganglionic fibers synapse with several postganglionic fibers
what cranial nerves have a functional classification of motor
oculomotor, trochlear, accessory
what is the plexus of the spinal nerves
cervical, brachial , lumbar
efferent nerves or fibers are found
in the ANS, and somatic nervous system
somatic motor and autonomic pathways have what same characteristics
made up of mostly efferent fibers, location of peripheral fibers, have acetylcholine as a neurotransmitter
acetylcholine can stimulate
cholinergic receptors
beta receptors bind with
norepinephrine
whiz is the neurotransmitter in a somatic motor pathway
acetylcholine
what color is a cone able to respond
green
what is true about temp receptors
they adapt rapidly, can respond to heat and cold, beyond a temp of about 48 degrees celcius sensation of burning pains is felt
taste buds are found in the
lining of the mouth, soft palate, tongue
pain that is perceived as being a superficial pain is one place but is actually caused somewhere else is the
referred pain
what receptors the most common and widely distributed receptors
free nerve endings
the number of pure or primary tastes are
5
both olfactory receptors and taste buds are
chemoreceptors
which tongue papillae are huge dome shaped bumps that form a transverse row near the back of the tongue
circumvallate papillae
pacinian corpuscles are
are found in the deep dermis, especially hands and feet
chemorecetprs are most limey to be activated by
noxious odors
which tongue papillae are large , mushroom shaped bumps found in the anterior two thirds of the tongue surface
fungiform papillae
dynamic equilibrium depends on the
crista ampullaris
sensory neurons in the sense are unique because they are regularly replaced by
smell
what are the primary taste sensations
sweet, sour, bitter
what are the vestibule of the inner ear
utricle, saccule
how many pairs of spinal nerves are connected to the spinal cord
31
afferent nerves do what
carry information into the CNS and help maintain homoeostasis by sensing change in the enviorment
efferent fibers do what
carry information away form the CNS, they regulate skeletal muscle, allowing us to defend ourself, gather food, and perform essential tasks
how are the spinal nerves attached
by the ventral and dorsal root
the dorsal root of each spinal nerve is easily recognized by swelling of the
dorsal root ganglion
the ventral rami of most spinal nerves subdivide to form complex
plexuses
what does the dorsal rami do
supplies somatic motor and sensory fibers to several smaller nerves
what does the phrenic nerve do
innervates the diaphragm and thus directly regulates our breathing
mixed cranial nerves contain axons of
sensory and motor neurons
brachial plexus is found deep in the
shoulder
what nerve supplies the thigh and leg
femoral nerve
what is the largest nerve in the body
sciatic nerve
the somatic motor nervous system includes
all the voluntary motor pathways outside the CNS
somatic reflexes involve
contractions of the skeletal muscle
autonomic (visceral) reflexes involve contractions of
smooth and cardiac muscle or secretion from the glands
which cranial nerve is responsible for the sense of smell
olfactory
the somatic motor system includes all the _____ motor pathways ____ of the CNS
voluntary;outside
if the center of a reflex arc is the brain, the response it mediates is called a
cranial reflex
a reflex consists of either muscle con ration or a
glandular secretion
a subdivision of the nervous system that regulates involuntary effectors is the ____ nervous system
autonomic
axon terminals of autonomic neurons release either of two neurotransmitters
norepinephine and ACTH
ACTS bind to ____ receptors
cholinergic
this is a subdiviosn of the nervous system that regulates involuntary effecter by efferent signals
autonomic nervous system
the major functions of the ANS are
regulate heartbeat, smooth muscle contraction, glandular secretion to maintain homeostasis
the sympathetic division of the ANS prepares us for
physical activity, increases heart rate, bp, perspiration, body temp
sympathetic nervous system is sometimes named the
flight or fight system
parasympathetic division does what activities
digestion, defecation, urination
slows down heart rate and respiration
parasympathetic phase is sometimes called
rest and repair
the first neuron is called a
preganglionic neuron
what is the second neuron called
postganglionic neuron
axons that release norepinehphrine are called
adrenergic fibers
axons that release acetylcholine are called
cholinergic fibers
the major function of the sympathetic division is that it serves as a
emergency system
when an adequate stimulus acts on a receptor, a potential develops in the receptors membrane , it is called a
receptor potential
what receptor is located on or very near the surface of the body
exeteroceptors
exterroceptors detect
touch, pain, and temp
which receptor is located internally within our organs
interoceptors
interoceptors provide information about our
internal enviornment
a special kind of interoceptor found in skeletal muscle, joint capsules, and tendons
propriceptors
respond to stimuli that in some manner measure changes in pressure or internal environment, inform us of pressure on the skin, or pressure in muscles and legs
mechanoreceptors
are activated by the amount or changing concentration of certain chemicals, senses of taste and smell
chemoreceptors
activated by changes in temp
thermoreceptors
percieve intense stimuli, the overal sensation of pain
nociceptors
found in our eyes and respond to light stimuli in the visible spectrum
photoreceptors
concentated in the hypothalamus and sense levels of osmotic pressure in our body fluids, important for detecting electrolyte changes
osmoreceptors
serve as the primary sensory receptors for pain, heat ,cold, and various forms of touch
dendritic knobs
which type of receptor is found only in the eye
photorecpetor
discriminative touch is mediated by a flattened or disk shaped free nerve ending called a
tactile disk
egg shaped mechanoreceptors that are larger than tactile disks, they are located in or very close tot he dermal papillae of hairless skin areas, they pick up sensation of light touch
tactile corpuscles or meissner corpuscles
slow adapting receptors and permit the skin of the fingers to continuously remain sensitive to deep pressure, gives you ability to grasp and object
bulbous corpuscles
found in the deep dermis of the skin, especially hands and feet, they respond quickly to sensation of deep pressure, high frequency vibration, and stretch
lamellar corpuslces or pacini corpuscles
protects our muscles from tearing internally or from pulling away from their tendons at points of attachment to bone
tendon reflex
huge dome shaped bumps arranged in a row that cross the back of the tongue
circumvallate papillae
bumps with threadlike projections, scattered among the fungiform papillae
filiform papillae
what its he main function of the filiform papillae
determine food texture
the ear is divided into which three anatomical parts
external ear, middle ear, inner ear
visible part of the ear surrounding the opening of the external acoustic metus
auricle
the middle ear contains the three auditory ossicles called
malleus , incus , stapes
composed partly of bone and cartilage and fibrous tissue
inner ear, eustachian tube
the inner ear is also called the
labyrinth
the bony labyrinth has three parts
vestibule, cochlea, and semicricular canlas
the clear potassium rich fluid fills the labyrinth is
endolymph
tiny bones in the middle ear are the
ossicles
the sense organs involved in the sense of balance are found in the vestibule and the
semicircular canlas
dynamic equilibrium depends on the functioning of the
crista ampullaris
what is the hearing sense organ
organ of corti
the tiny bones found in the middle ear are the
ossicles
the sense organs involved in the sense of balance are found in the vestibule and the
sermicircular canals
dynamic equlibrium depends on the functioning of the
crista ampullaris
the innermost coat of the eyeball is the
retina
cones are less numerous than rods and are densely concentrated in the
fovea centeralis
the substance that fills both chambers of the anterior cavity of the eye is the
aqueous humor
as people grow older they tend to become farsighted this condition is called
hyperopia
the lacrimal canals empty into the lacrimal sacs and open into an opening or
punctum
skeletal muscles that attach to the outside of the eyeball and to the bones of the orbit
extrinsic eye muscles
smooth muscle located within the eyes
intrinsic eye msucles
clear watery substance often leaks out when the eye is injured
aqueous humor
soft gelatin appearance, helps maintain enough internal pressure within the eye to prevent eye ball from collapsin
vitreous humor
what are the formed elements in blood
platelet, red blood cell, white bood cell
what is used to determine the volume percentage of the red blood cells in whole blood
hematocrit
erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as
adult stem cells
a glycoprotein that is secreted to increase oxygen concentration in the tissue is
erythorpoietin
what are the granulocytes
neutrophils, eosinophils, basophils
neutrophils are highly mobile and phagocytic. They migrate out of blood vessels and into tissue spaces this process is called
diapedesis
a decrease in the amount of white blood cells is called
leukopenia
platelets play an important in role in
blood clotting
what components are critical to coagulation
prothrobin, thrombin, fibrinogen, fibrin
a natural constituent of blood acts as an antithrombin and prevents clots from forming in vessles
heparin
the physiological mechanism that dissolves in clots is known as
fibrinolysis
produces and secretes compounds called hormones that aid in controlling the bodes metabolic activities
endocrine system
are hormones produced and secreted and secreted by the anterior pituitary gland. These hormones target other endocrine glands and stimulate their growth and secretion
tropic hormones
target reproductive tissues and anabolic hormones stimulate anabolism in their target cells
sex hormones
manufactured from cholesterol a four ring lipid
steroid hormones
synthesized primarily from proteins, peptides and amino acids rather than from cholesterol
nonsteroid hormones
manufactured from cholesterol
steroid horomones
are synthesized primarily from proteins, peptides and amino acids that than from cholestol
nonsteroid hormones
are unique group of lipids that act as a local hormones
prostaglandins
prostaglandins contorl
bp, metabolism, bodily functions, cause uterine contractions
the master gland
pituituary gland
promotes body growth indirectly by stimulating the liver to produce certain growth factors
growth hormone(soatotropin)
vital to the production of milk after pregnancy
prolactin
promotes and maintains the growth and development of the thyroid gland
thyroid stimulating hormone
promotes and maintains normal growth and development of the cortex of the adrenal gland
adrenocorticoptropic hormone
stimulates the follicles of the ovaries to grow and mature
follicle stimulating hormone
stimulates the formation and activity of the corpus luteum of the ovary
luteinizing hormone
stimulate the growth and maintenance of the gonads
gonadotropins
controls thirst, hunger,fatigue, body temp
hypothalamus
carries blood from the hypothalamus directly to the anterior pituitary gland ,where the target cells of the different releasing hormones are located
hypophyseal portal system
serves as a storage release site for two important hormones ADH and Oxytocin
posterior pituitary gland
inhibits production of large amounts of urine
ADH
increases arterial bp
vasopressin
uncommon condition in which the pt produces abnormally lg amounts of urine because the kidneys are unable to conserve water
diabetes insipidus
oxytocin has two primary functions
stimulates contraction of uterine muscles during labor, causes milk ejection into the breast ducts of lacerating women
produces melatonin
pineal gland
stimulates T4 and T3
thyroid stimulating hormone
stimulates the metabolism of almost every body tissue
T3 and T4
acts on bone and kidney cells to increase the release of calcium into the blood
parathyroid hormone
located above the kidneys
adrenal glands
outer portion of gland,
adrenal cortex
inner portion of gland
adrenal medulla
regulate how mineral salts are processed in the body
mineralocorticoids
maintains the sodium homeostasis of the blood
aldosterone
functions of the glucocorticoids
accelerate breakdown of proteins into amino acids, energy source, maintaining normal bp, increases as part of stress response
sex hormones
gonadocorticoids
secretes two important hormones epinephrin and norepinephrine
adrenal medulla