A&P Flashcards
Axons bound together by connective tissue
Nerves
Individual cells in the brain
Neurons
group of fibers outside the CNS
Nerves
group of fibers inside the CNS
Tracts
Efferent
Motor
Afferent
Sensory
Pyramidal also called
Direct Activation Pathway
Pyramidal tracts (originate in _______) carry fibers to ______
cerebral cortex
spinal cord/brainstem
Pyramidal responsible for
Voluntary control (body and face muscles)
Pyramidal breaks into
corticospinal and corticobulbar tracts
Extrapyramidal also called
Indirect Activation Pathway
Extrapyramidal tracts (originate in _____)carry fibers to _______
brainstem
spinal cord
Upper Motor Neurons: found in
cerebral cortex/brainstem
Lower Motor Neurons: found in
brainstem/spinal cord
Transmit nerve impulses from brain to lower motor neurons
UMNs
Transmit nerve impulses from UMNs to muscles
LMNs
Corticospinal: synapse/terminate in the
Spinal Cord
Corticobulbar: synapse/terminate in the
Brainstem
Controls movement in limbs & trunk
Corticospinal
Controls muscles of face, head, neck
Corticobulbar
The CNS is made of the
Brain and spinal cord
The PNS is made of the
cranial and spinal nerves
Afferent division
All impulses go up to the CNS
Efferent division
Impulses go down from the CNS to the muscles
Visceral afferent controles
unconscious perception from organs, glands, blood vessels
Somatic afferent controls
conscious perception of touch, pain, temperature
Visceral efferent controls
cardiac muscle, smooth muscle, glands
Somatic efferent controls
skeletal muscle
Visceral efferent breaks into
sympathetic (fight or flight), parasympathetic (rest and digest)
3 main parts of the human brain
Forebrain
Midbrain
Hindbrain
Functions of the Forebrain
processes sensory info, reasoning/problem solving, automatic, motor functions
2 subgroups of the Forebrain
Telencephalon
Diencephalon
Telencephalon is the
frontal, parietal, temporal, occipital lobes
Diencephalon is the
Thalamus, hypothalamus, pineal gland
Midbrain functions
regulates movement, processes auditory and visual info
2 subgroups of midbrain
Tectum, Paired cerebral peduncles
Functions of Hindbrain
regulates autonomic functions, balance, equilibrium, relay of sensory info
2 subgroups of hindbrain
Metencephalon, Myelencephalon
Metencephalon breaks into
pons, cerebellum
Myelencephalon breaks into
medulla oblongata
“thinking portion” of brain; most complex cognitive functions
Cerebrum
Automatic reflexes/vegetative functions (e.g. breathing, heart rate, etc.) are a function of…
Brainstem
Voluntary movements; balance, coordination, posture, attention
Cerebellum
Regulates respiration, heart rate + reflexes such as vomiting, swallowing
Medulla
Attachment between cerebellum and rest of CNS
Pons
Houses substantial nigra (production of neurotransmitter dopamine)
Midbrain
Fine-tunes voluntary body movements, motor coordination, posture
Basal ganglia
Allows afferent impulses to transmit to brain + efferent from brain to body
Spinal cord
Relay center for sensory and motor signals
Thalamus
Homeostasis, regulates hunger/thirst, pain/pleasure, anger/aggression
Hypothalamus
Responsible for new memories, emotions, spatial navigation
Hippocampus
Responsible for emotions, arousal, motivation
Amygdala
Auditory processing
Heschl’s Gryus
Involved in semantic processing, language and cognition
Angular gyrus
Broca’s area
speech production
Wernicke’s area
language comprehension
language dominant hemisphere
Left hemisphere
Damage to left hemisphere =
aphasia
Supporting language hemisphere
Right hemisphere
connects the internal carotid and vertebral/basilar system
Circle of Willis
Supplies blood to frontal & parietal lobes, basal ganglia, & corpus callosum
Anterior Cerebral Artery
Stroke in ACA would lead to
opposite leg weakness
Supplies blood to Broca & Wernicke, temporal lobe, & primary motor cortex
Middle Cerebral Artery
Supplies blood to occipital lobes, cerebellum, & inferior temporal
Posterior Cerebral Artery
Interconnect identical & corresponding areas of 2 cerebral hemispheres
Commissural Fibers
Connect different regions of the cerebra; cortex within same hemisphere
Association Fibers
Connect cerebral cortex to brainstem and below
Projection Fibers
Masseter
elevates jaw (CNV3)
Temporalis
Lifts and retracts jaw (CN V3)
Medial Pterygoid
Elevates mandible- rotary chew
Lateral Pterygoid
Side-to-side- rotary chew
goal of life is sustenance, automatic & consistent
Vegetative breathing
expiration more important than inspiration, speak on exhale
Speech breathing
the process of expiration and inspiration
Ventilation
Respiration occurs as a result of pressure changes
Volume of gas increased = pressure decrease
As volume of lungs expands, pressure drops, and becomes negative in relation to atmospheric pressure
Causes air to flow into lungs
Boyle’s Law
modulate the flow of air being expelled from the lungs during phonation
Vocal folds
Abduction
open
Adduction
closed
3 pairs of vocal folds:
True Vocal Folds
Aryepiglottic Folds
Ventricular (false) Folds
Velopharyngeal closure involves the contraction of…
Palatoglossus (CNXI & Pharyngeal plexus)
Tensor Veli Palatini (CN V3)
Levator Veli Palatini (Pharyngeal Plexus (IX & X))
What innervates palatoglossus?
CN XI & Pharyngeal plexus
What innervates Tensor Veli Palatini?
CN V3
What innervates Levator Veli Palatini?
Pharyngeal Plexus (IX & X)
causes the change in pressure that pulls VFs together; speed of air increases and “sucks” VFs toward one another- closure of folds
Bernoulli Effect
wave-like motion of VF cover
Mucosal Wave
An opening (created through the neck into the trachea)
Tracheostomy
Surgical removal of larynx due to trauma/cancer
Laryngectomy
Fenestrated tracheostomy
Small hole to allow air to pass through tube to vocal folds
Unfenestrated tracheostomy
No small holes, requires speaking valve for air to be passed to vocal folds