Psychobiology Flashcards
Central Nervous System (CNS)
the division of nervous system located in the skull and spine (interprets information)
Peripheral Nervous System (PNS)
nervous system located outside the skull and spine (receives and transmits information)
Somatic Nervous System (SNS)
part of the PNS that interacts with the external environment using efferent and afferent nerves
Nerves
collections of axons outside of the CNS
Tract
collections of axons inside the CNS
Nucleus
collection of cell bodies inside CNS and part of an axon
Ganglias
collection of cell bodies outside of the CNS
anterior singulet
the base for nuero-navigation
SNS Purpose
Somatic division of PNS is comprised by nerves that control muscle action and that carry sensory information back to the CNS and contains cranial nerves and spinal nerves
Autonomic Nervous System (ANS)
part of the PNS that regulates the body’s internal environment. uses afferent and efferent nerves to send and receive signals to and from internal organs. also contains two types of nerves, sympathetic and parasympathetic.
Efferent nerves
sends signals from the CNS (exits) (motor)
Afferent nerves
sends signals to the CNS (approach) (sensory)
meninges
layers that protect the brain
name meninges layers
dura mater (outer)
arachnoid (middle)
pia mater (inside)
sympathetic nerves
fight or flight
parasympathetic
normal functioning
neuraxis
an imaginary line drawn through the spinal cord up to the front of the brain
anterior/rostral (neuraxis)
toward the head
posterior/caudal (neuraxis)
toward the tail
ventral/inferior (neuraxis)
toward the belly
dorsal/superior (neuraxis)
toward the back
ipsilateral
same side of brain
contralateral
opposite side of brain
SNS nerve types
cranial nerves 12
spinal nerves 31
cranial nerves
olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibular, glossopharyngeal, vagus, accessory, hypoglossal
spinal nerve sections
cervical, thoracic, lumbar, sacral, coccyx/coccygeal
dermatomes
area of skin that is supplied by (mostly) a single nerve
ventricles in the brain
structures that produce cerebrospinal fluid (CSF) and transport it around the cranial cavity
choroid plexus
lines the walls of ventricles and manufactures CSF
Purpose of Cerebrospinal Fluid (CSF)
- Cushioning effect and lubrication for the brain and spinal cord
- helps to maintain pressure within cranium
- transports metabolic waste away from brain and spinal-cord tissue into the bloodstream
the blood-brain barrier
border of endothelial cells that prevents toxins or pathogens entering the CSF from blood.
also filters in nutrients and filters out harmful compounds.
how is the nervous system developed?
develops from a layer of epidermal cells in the embryo called the neural plate, which folds over to form the neural tube.
Hydrocephalus
a build up of CSF in cranial ventricles throughout the brain
nuerons
cells that are specialised for the reception, conducting and transmission of electrochemical signals
types of neuroglia
oligodendroglia (oligodendrocytes)
astroglia (astrocytes)
microglia
ependymal cells
oligodendroglia (oligodendrocytes)
form myelin sheaths
astroglia (astrocytes)
support neurons, absorb debris, form part of the brain-blood barrier
Microglia
part of the CNS immune system, respond to injury or disease
medial
towards the midline
lateral
away from the midline
sagittal plane
brain cut vertically from front to back
frontal plane
brain cut vertically front left to right
cross section
any right angle cut to a long section or narrow path such as the spinal cord
grey matter
composed of cell bodies and unmyelinated interneurons
white matter
composed of myelinated axons
spinal nerves
pairs of nerves attached to the 31 sections of the spine
dorsal root axons are only
afferent
ventral root axons are only
efferent
encephalon
in the brain
5 divisions of the brain
telencephalon (cerebral hemispheres)
diencephalon
mesencephalon (midbrain)
metencephalon
myelencephalon (medulla)
the brain stem consists of which brain divisions
diencephalon
mesencephalon
metencephalon
myelencephalon
Olfactory function
smell
optic function
vision
oculomotor function
eye movement, pupillary constriction, sensory signals from certain eye muscles
trochlear
eye movement, sensory signals from certain eye muscles
trigeminal
facial sensations, chewing
abducens
eye movement, sensory signals from certain eye muscles
facial
taste from anterior 2/3 of tongue, expression, tears, salivation
vestibular
audition, organs of balance in the inner ear
glossopharyngeal
taste from posterior third of tongue, salivation, swallowing
vagus
sensation from abdominal and thoracic regions, muscles of throat
accessory
movement of shoulders, neck and head , sensory signals from muscles of the neck