Chapter 11 Review Flashcards
Procencephalon
-Forebrain split up into the Telencephalon and the Diencephalon
Telencephalon
- Part of the Procencephalon
- Lateral ventricles, interventricular foramen, cerebrum, basal nuclei, and hippocampus
Diencephalon
- Part of the Procencephalon
- third ventricle, mammillary bodies, hypothalamus, thalamus, pineal gland, and pituitary gland
Mesencephalon
- Midbrain and it doesn’t split
- cerebral aqueduct, cerebral peduncles, and corpora quadrigemina
Rhombencephalon
-Hind brain is split into Metencephalon and Myelencephalon
Metencephalon
- Part of the Rhombencephalon
- fourth ventricle, cerebellum, pons, and cerebellar peduncles
Myelencephalon
- Part of the Rhombencephalon
- fourth ventricle, medulla oblongata
Neural tube
- The CNS is developed from it
- Center is called ventricle
- resides in the dorsal cavity
Pia, Arachnoid, Dura mater
- Dura:Tough outer layer of the meninges
- Arachnoid:Delicate, weblike middle layer of the meninges; has no blood vessels
- Pia:Inner layer of meninges that encloses the brain and spinal cord
Subarachnoid space
-Rests between the arachnoid and pia mater, which contains cerebrospinal fluid
Epidural space
- Space between the dural sheath of the spinal cord and the bone of the vertebral canal
- adipose tissue, loose connective tissue, & blood vessels are found in the epidural space
Broca’s Area(motor speech area)
- Located in the frontal lobe, usually the left hemisphere depending on hemisphere dominance
- important in generating the complex pattern of muscular actions of the most, tongue, and larynx, which make speech possible
Wernicke’s Area(sensory speech area)
- Located in the temporal lobe
- important for understanding and formulating written and spoken language
Falx cerebelli
-Separates the right and left cerebellar hemispheres
Tentorium cerebelli
-Separates the occipital lobes of the cerebrum from the cerebellum
Falx cerebri
-Extends downward into the longitudinal fissure, and separate the right and left cerebral hemispheres
Interventricular foramen
- the opening from each lateral ventricle into the third ventricle of the brain
- found in the prosencephalon
Choroid plexuses
- masses of specialized capillaries from the pia mater, covered by a single layer of specialized ependymal cells
- act much like the astrocytes in blood brain barrier
Blood-brain barrier
-Astrocytes provide a barrier between the blood and the brain interstitial fluid
Arachnoid granulations
- Any of several fingerlike structures that projects from the subarachnoid space of the meninges into blood-filled dural sinuses and reabsorbs cerebrospinal fluid
Basal nuclei
- Masses of grey matter deep within a cerebral hemisphere
- Parkinson’s affects this structure
- Located in the Telencephalon
- Produces Dopamine
cerebrum
-Largest part of a mature brain
-
corpus callosum
- Connects the cerebral hemisphere
- enables the dominant hemisphere to control the motor cortex of the non-dominant hemispheres
gyri
- many ridges of convultions separated by grooves, mark the cerebrum’s surface
sulcus
-A shallow to somewhat deep groove
fissure
-A very deep groove
anencephaly
- A type of neural tube defect; it occurs at about the 28th day of prenatal development
- A sheet of tissue that normally fold to form the neural tube remains open at the top
insula(island of Reil)
- Located deep within the lateral sulcus
- Gustatory cortex
- taste
cerebral cortex
- responsible for intelligence and personality
- interpreting impulses from sense organs, initiating voluntary muscular movements
limbic system
-Responsible for emotional responses to certain stimulus
postcentral gyri(primary somatosensory)
- Located in parietal lobes
- sensations of temperature, tough, pressure, and pain in the skin
frontal lobe
-higher intelectual processes: concentrating, planning, and complex problem solving
parietal lobe
-sensory information and aid in understanding speech
occipital lobe
-provides vision
temporal lobe
-centers for hearing, taste, and smell
primary auditory cortex
-superior temporal gyri
primary visual cortex
-located in occipital
precentral gyri(primary motor cortex)
- Located in frontal lobe
- The nervous tissue in these regions contains many large pyramidal
- voluntary movement of the eye
pyramidal cells
-They send impulses from the motor cortex into the spinal cord on descending tracts
hippocampus
- memory consolidation
- located in the Telencephalon
pituitary gland
-biological clock
thalamus
- Receives all sensory impulses except for smell
- relays sensory information by synchronizing action potentials
hypothalamus
-maintains homeostasis
mammillary bodies
-their projections to the anterior thalamus via the mammillothalamic tract, are important for recollective memory.
pineal gland
-produces melatonin, which helps maintain circadian rhythm and regulate reproductive hormones
Parkinson’s Disease
- progressive disorder of the nervous system that affects movement.
- replacing or enhancing use of dopamine can temporarily alleviate symptoms
cerebral peduncles
- These fibers include descending tracts and are the main motor pathways between the cerebrum and lower parts of the nervous system
- Found in the mesencephalon
corpora quadrigemina
- make up the superior and inferior colliculi
- superior=visual reflexes
- inferior=auditory reflexes
- Found in the mesencephalon
red nucleus
-communicates with the cerebellum and with the centers of the spinal cord, and it plays a role in reflexes that maintain posture
pons
- conduct impulses from the cerebrum to center within the cerebellum
- Found in the Metencephalon
medulla oblongata
- receive sensory impulses from fibers of ascending tracts and pass them on to the thalamus or the cerebellum
- Found in the Myelencephalon
reticular formation
- found throughout the brainstem
- It is meant to help a person focus and heighten their senses
- damage to it leads to coma
cerebellum
-Comparator
cerebellar peduncles
- Allows the cerebellum to communicate with other parts of the CNS
- made up of three nerve tracts
- found in metencephalon
cervical enlargements
-thickening in the spinal cord found in the neck region, which supplies nerves to the upper limbs.
lumbar enlargements
-thickening in the spinal cord of the lower back region, gives off nerves to the lower limbs
conus medullaris
-Inferior to the lumbar enlargement, the spinal cord tapers to this structure.
anterior, lateral, posterior funiculi
-The white matter of the spinal cord which is split into three regions anterior, lateral, and posterior. consists of longitudinal bundles of myelinated nerve fibers that compose the major pathways called tracts.
ascending tracts
-Sensory pathways
descending tracts
-Motor pathways
fasciculus gracilis
- Part of the posterior funiculi, located medially
- waist down
- processes proprioception and touch
fasciculus cuneatus
- Part of the posterior funiculi, located laterally
- waist up except for face
- processes proprioception and touch
spinothalamic (anterolateral) tracts
- somatosensation: pain and temperature
- part of the anterior and lateral funiculi
spinocerebellar tracts
- part of the lateral funiculi
- proprioception
lateral and anterior corticospinal tract
-impulses that travel through the anterior corticospinal stay on the same side and do not swap to the contralateral side, while the lateral corticospinal swaps to the contralateral side
ALS (Lou Gehrig’s Disease)
-motor neurons in the spinal cord, brainstem, and cerebral cortex degenerate.
CN 1
- Olfactory Nerves
- Sense of smell
- Only sensory nerves
CN2
- Optic Nerves
- vision
CN3
- Oculomotor nerves
- raising the eyelid and moving the eye
CN4
- trochlear nerves
- smallest
- external eye muscles
CN5
- trigeminal nerves
- largest
- ophthalmic, maxillary, and mandibular
CN6
- abducens nerves
- external eye muscles
CN7
- facial nerves
- taste receptors, facial expression
CN8
- vestibulocochlear nerves
- sense changes in the position of the head
- hearing receptors
CN9
- glossopharyngeal nerves
- tongue and pharynx
- functions in swallowing
CN10
- Vagus nerves
- parasympathetic
- speech and swallowing reflexes
- larynx and pharynx
CN11
- spinal accessory
- trapezius and sternocleidomastoid
CN12
- hypoglossal nerves
- moves the tongue in speaking, chewing, and swallowing
sympathetic divison
- -Thoracolumbar division
- fight or flight
- preganglionic>cholinergic
- postganglionic>adrenergic
parasympathetic division
- craniosacral division
- rest and digest
- preganglionic and postganglionic> Choinergic recpetors
preganglionic fiber
-Leaves the CNS and synapses with one or more neurons whose cell bodies are within an autonomic ganglion
postganglionic fiber
-extends to a visceral effector
cholinergic receptors
he preganglionic neurons of the sympathetic and parasympathetic divisions all secrete acetylcholine
adrenergic receptors
Most sympathetic postganglionic neurons, secrete norepinephrine
spina bifida
- a type of neural tube defect
- An opening is farther down the neural tube, and in severe cases ma cause paralysis from that point downward