PSYC 280 Chapter 2

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173 Terms

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Nerves
sensory fibres → connect to assoc. nuclei
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Periphery
body → ex. gut, skin
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Viscera
ex. glands, internal organs (ex. heart, lungs, gut)
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Encephalization
worm-like animal evolves head on FRONT
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White matter
set of myelinated axons
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Somatosensory
touch
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Olfactory
smell
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Gustatory
taste
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Horizontal plane
div's top/bottom → runs para to ground
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Sagittal plane
div's left/right → runs from front to back
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Midsagittal plane
EXACTLY in MIDDLE of left/right hemis
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Coronal plane
div's front/back → runs from left to right
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Dorsal
TOP (brain) / BACK (spinal cord / PNS)
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Ventral
BOTTOM (brain) / FRONT (spinal cord / PNS)
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Rostral (AKA anterior)
FRONT (brain) / TOP (spinal cord / PNS) → twds head
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Caudal (AKA posterior)
BACK (brain) / BOTTOM (spinal cord / PNS) → twds tail
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Medial
NEAR midline
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Lateral
FAR from midline
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Peripheral nervous system (PNS)
nerves in body → touch & mvmnt → inc. MOST inputs/outputs to brain
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Somatic nervous system (SNS)
body parts w/ volitional control = ability to move by thinking → need to reach nutrients/water
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Afferent nerves
* type of spinal nerve → part of SNS
* input → ENTER dorsal spinal cord
* somatosensory → feel touch / detect motion
* can move (NOT feel) muscles below cut if severed
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Efferent nerves
* type of spinal nerve → part of SNS
* output → EXIT ventral spinal cord
* motor sys → synapse w/ muscles → allows to move muscles
* can feel (NOT move) muscles below cut if severed
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How do signals travel along afferent/efferent nerves?

1. Sensory signals from afferent nerves move UP dorsal spinal cord to brain
2. Sensory signals = processed/felt → UPDATES motor progs
3. Motor signals from brain move DOWN ventral spinal cord to efferent nerves
4. Motor signals EXIT to muscles
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Reflexes
* SMALLEST units of org of behav → exist @ spinal cord lvl
* Learning to act/move volitionally involves coord'ing/inhibiting in pattern
* Ex. afferent neuron connected to motor neuron in spinal cord
* If afferent neuron feels stimulation, motor neuron sends signal to muscles to move
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Autonomic nervous system (ANS)
* body parts w/ NO volitional control


* Things control for viscera:
* Sensory/motor ftns → MANY involve relay ganglia
* Rates → ex. heart rate
* Lungs have volitional control → so can consciously CHANGE breathing rate
* ONLY way to affect body parts w/ NO volitional control → INDIR
* Ex. can only INC heart rate by breathing HARD
* b/c breathing = ONLY way SNS/ANS interxt
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Enteric nervous system (ENS)
digestive system (AKA GI tract) → part of ANS
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Sympathetic division
* division of ANS
* sympathetic chain = ganglia in chain along spinal cord → just OUTSIDE vertebrae
* Activating/arousing
* Twds fight/flight/freeze → senses focused on dealing w/ threat
* Active when:
* Aroused → ex. sexually
* Inhaling
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Parasympathetic division
* division of ANS
* vagus nerve
* Calming
* Twds broaden/build → ready to create / play / expand outwd
* Active when exhaling
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Cranial nerves
nerves in head/neck → part of SNS
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cranial nerve nuclei
nuclei in hindbrain
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Sensory nerves
carry info about wld that allows to sense
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Motor nerves
carry signals from brainstem that allow to move
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Olfactory
cranial nerve for smell
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Optic
cranial nerve for vision
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Oculomotor
cranial nerve for MOST eye mvmnt
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Trochlear
cranial nerve for rotation & vert eye mvmnt
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Trigeminal
* cranial nerve for jaw mvmnt & face sense
* ALL parts (jaw & above) = sensory → only ALSO motor in jaw
* Causes migraines
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Abducens
cranial nerve for outwd horiz eye mvmnt
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Facial
* cranial nerve for face mvmnt
* Motor ABOVE jaw → so wk's w/ trigeminal
* allows to express/detect emo → esp. muscles around eyes
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Vestibulocochlear (AKA auditory)
cranial nerve for balance & hearing
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Glossopharyngeal
* cranial nerve for taste & throat mvmnt
* Ex. swallowing → wk's w/ trigeminal (does chewing)
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Vagus (AKA vagal complex)
cranial nerve comprising ANS parasympathetic division
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Spinal accessory
cranial nerve for neck mvmnt
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Hypoglossal
cranial nerve for tongue mvmnt
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Central nervous system (CNS)
brain + spinal cord
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Why is spinal cord thicker closer to brain?
includes MORE of axons from PNS
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Nucleus
bundle of somas in CNS → type of bulbous struct
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Ganglion
bundle of somas in PNS → type of bulbous struct
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Dorsal root ganglion
1st loc. where signals from afferent neurons collected B/F moving UP spinal cord to brain
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What is weight of brain (AKA encephalon)?
3lbs
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Hindbrain
brainstem → contains medulla & metencephalon
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Medulla (AKA myelencephalon)
* Part of hindbrain
* ANS life-support sys → above spinal cord
* WORST area to damage → ex. stroke can affect breathing/heart rate
* Contains:
* Reticular activating system
* Cranial nerve nuclei → cranial nerves enter/exit
* OTHER nuclei
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Reticular activating system (RAS)
* part of medulla
* sends arousing/activating signals UP to REST of brain
* midpt b/w / coordinates HIGHER brain areas & body
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Metencephalon
Part of hindbrain containing pons & cerebellum
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Pons
* part of metencephalon
* bulbous part → above / continuation of brainstem
* Made of white matter
* Axons enter/exit cerebellum → send signals to coord motor progs from cerebellum to spinal cord
* Contains:
* Cranial nerve nuclei → cranial nerves enter/exit
* OTHER nuclei → source of neurotransmitters (ex. dopamine, serotonin, norepinephrine)
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Cerebellum
* part of metencephalon
* behind brainstem
* Contains 1/2 of brain's neurons → DENSELY packed b/c SMALL area
* Stores motor progs
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Motor programs
* skilled/coord'd/well-prac'd/automatic mvmnts NOT req'ing conscious thinking
* REGRESS to lvl of kid learning mvmnt if consciously think too HARD about mvmnt
* Initiated volitionally by frontal lobe
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Midbrain (AKA mesencephalon)
* Contains:
* Cranial nerve nuclei → cranial nerves enter/exit
* OTHER nuclei → act as sensory & motor relays
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Sensory & motor relays
integration pts b/w DIFF behav brain sys's
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Forebrain
Contains diencephalon & telencephalon
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What are the evolutionarily newest brain areas?
forebrain & cerebral cortex
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Diencephalon
part of forebrain containing thalamus & hypothalamus
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Thalamus
* UPPER part of diencephalon
* **Sensorimotor integrator** = integrates sensory perception & initiated motor progs
* Allows to compare motor progs' EXPECTED (dev'd by brain) & ACTUAL (shown by sensory sys) outcome
* Allows to MIN prediction error = DIFF b/w (signals about) EXPECTED/ACTUAL outcome
* Central hub for ALL brain netwks → ALL sensory pathways pass thru to comm w/ cortex
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Hypothalamus
* LOWER/FRONT part of diencephalon & part of limbic sys connected to brainstem
* **Neuroendocrine integrator** → interface b/w nerv & **endocrine** (hormone) sys's
* Connects to pituitary gland
* Elec stimulating causes EITHER agg/calming behav
* **4 Fs** = fighting, fleeing, feeding, mating
* Controls/coords homeostasis / behav (ex. motivational, sexual) (drives) by integrating w/ brainstem structs
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Pituitary gland
* MASTER gland → releases hormones thruout body
* creates feedbk cycle by affecting OTHER brain areas thru circulation
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Telencephalon (AKA cerebral hemispheres)
part of forebrain containing basal ganglia, limbic sys, & cerebral cortex
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Basal ganglia
* Subcortical part of telencephalon
* nuclei in brain → motor ftn (ex. tracking)
* Inc. part of thalamus & (debated) substantia nigra
* MINS prediction error
* Contains:
* Dorsal/ventral striatum
* Internal/external globus pallidus
* Subthalamic nucleus
* Substantia nigra
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Dorsal striatum (AKA striatum / caudate putamen)
* LARGEST part of basal ganglia
* caudate + putamen
* Controls amount of force/vigour/motivation in mvmnt
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Ventral striatum
* part of basal ganglia
* reward/reinforcement circuit → controls amount of motivation / effort used to get what want
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Nucleus accumbens
MAIN part of ventral striatum
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Internal & external globus pallidus
* part of basal ganglia
* control info flow thru basal ganglia
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Subthalamic nucleus
* part of basal ganglia
* connects/coordinates basal ganglia & thalamus
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Substantia nigra
* part of basal ganglia in midbrain
* Source of dopamine for striatum → somas make/send dopamine down axons to axon terminals in striatum → regulates striatum motor component
* LOSS of neurons = neural correlate of Parkinson’s disease
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Parkinson’s disease
tremors → neural correlate = LOSS of substantia nigra neurons → b/c NO dopamine for striatum
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Cortico-striato-thalamo-cortical loop
* neural circuit of activity where basal ganglia, thalamus, & cortex wk tog for consciousness
* Steps → 1 cycle → REPEATS:


1. Cortex sends signal thru striatum to basal ganglia
2. Basal ganglia sends signal to thalamus
3. Thalamus sends signal as feedbk to cortex
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Feedback frequency
* Type of rate → see things changing FASTER as continuous INSTEAD
* Ex. flicker fusion phenomenon → see flickering light as STEADY when flickers FASTER
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What is feedback frequency of cortico-striato-thalamo-cortical loop?
40Hz (cycles/s) = 25ms/cycle (+/-5) → so see things changing FASTER than 20ms as continuous INSTEAD
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Limbic system
* MOSTLY subcortical part of telencephalon
* Emos
* Contains:
* Septal nuclei
* Amygdala
* Hippocampus
* Hypothalamus
* Cingulate cortex
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Septal nuclei
* Medial part of limbic sys
* pleasure & reward
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Amygdala
* part of limbic sys
* emo (valence) → ex. fear conditioning
* Inc. soc emos → ex. soc avoidance/approach/perception
* Degraded by toxoplasmosis gondii
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Toxoplasmosis gondii
bacterial infection → degrades amygdala → so LOSE fear ability
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Hippocampus
* part of limbic sys
* mem consolidation → mems pass thru B/F stored in LTM → ALTHO does NOT store mems
* LOSS causes anterograde amnesia
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Anterograde amnesia
* CANNOT form/consolidate NEW declarative mems b/c lose BOTH hippocampi → BUT:
* Keep OLD mems
* Can STILL learn NEW skills → b/c stored in cerebellum
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Cingulate cortex
* cortical part of limbic sys → medial & ABOVE corpus callosum
* stimulus valuation, goal tracking, self-awareness
* Parts → anterior & posterior
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Stimulus valuation
amount that prefer thing
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Goal tracking
check whether reached subgoals of LARGER goal → COMPLEX behav
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Cerebral cortex (AKA cortex / neocortex)
* Part of telencephalon
* OUTER brain layer
* 2mm deep, 10-20bil neurons
* 5 lobes → EACH assoc. w/ MAIN sense → occipital, temporal, parietal, frontal, insular
* Transition zones b/w lobes coord / assoc. w/ BOTH senses → BETTER than 1 sense
* 6 layers → based on neuron type/struct & chara input/output
* Local categorization → based on localizing ftns → b/c MAIN senses of EACH lobe do NOT use WHOLE lobe → primary/secondary sensory/motor cortices, association cortex
* If based on cell type → B/F - 50 areas, NOW - 150-200 areas
* Contains corpus callosum
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Occipital lobe
Visual part of cortex → MOST impt sense
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Temporal lobe
Auditory part of cortex → ALSO has OTHER ftns
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Parietal
* Somatosensory part of cortex → ABOVE temporal & in FRONT of occipital
* Does spatial/temporal processing → ex. determine space's layout by touch
* Contains postcentral gyrus
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Postcentral gyrus
* MOST anterior part of parietal lobe BESIDE frontal lobe
* Where exp touch
* Contains body plan for OUTSIDE of body
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Body plan
maps which brain areas' neurons get elec stimulated when spec body part touched
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Frontal lobe
Olfactory & executive ftn part of cortex → contains prefrontal cortex
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Prefrontal cortex
Part of frontal cortex BEHIND motor strip
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Insular lobe
* Gustatory & somatosensory (ONLY for INSIDE of body) part of cortex
* Contains body plan for INSIDE of body (ex. viscera)
* INSIDE brain UNDER Sylvian fissure
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Sylvian fissure
line div'ing temporal from frontal/parietal cortex
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Gyrus
groove
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Sulcus
valley
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Interneurons
* inhibit/stabilize/regulate local SHORT-dist neural circuits/comm
* binds input & output signals across layers so ALL layers send SAME signal to DIFF areas
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Columns
SMALL ftn'al units / sections of cortex