Anatomy and Physiology Flashcards
includes anatomical terms, nervous system, the human brain, neuroanatomy, blood supply, connecting fibers, cranial nerves, and head and neck
nerves
axons bound together by connective tissue
tracts
- group of fibers inside the CNS
- spinal tracts carry info up/down the
afferent
- sensory nerves
- signal comes up from sensory organ via nerve to brain (arrives)
pyramidal
- tracts originate in the cerebral cortex
- carry fibers to spinal cord/brainstem
- voluntary control (body and face muscles)
extrapyramidal tracts
- tracts originate in brainstem
- carry fibers to spinal cord
- involuntary and automatic control (tone, balance, posture, etc.)
upper motor neurons (UMN)
- found in cerebral cortex/brainstem
- transmit nerve impulses from brain to lower motor neurons (LMN)
lower motor neuron (LMN)
- found in brainstem/spinal cord
- transmit nerve impulses from upper motor neurons (UMN) to muscles
corticospinal
- synapse/terminate in spinal cord
- controls movements in limbs and trunk
- corticospinal, *think spinal cord
corticobulbar
- synapse/terminate in brainstem
- controls muscles of face, head, and neck
- corticobulbar, *think brainstem
unilateral
one side innervating
bilateral
both sides innervating
ipsilateral
same side of body
contralateral
opposite side of body
proximal
near given position
distal
away from give position
anterior
in front of
posterior
behind
superior
above
inferior
below
rostral
front, towards the nose
caudal
back, towards the tail
central nervous system (CNS) includes…
brain and spinal cord
peripheral nervous system (PNS) includes…
all other nerves that are not in brain/spinal cord
sensory (afferent)
impulses go up (arrive) to CNS
motor (efferent)
impulses go down (exit) from CNS to muscles
somatic
- voluntary
- skeletal muscles
autonomic
- involuntary
- cardiac and smooth muscles, glands
autonomic system includes…
- parasympathetic division
- sympathetic division
parasympathetic division
controls body functions at rest
sympathetic division
fight, flight, or freeze response
major divisions of the brain
- forebrain
- midbrain
- hindbrain
forebrain includes…
- telencephalon
- diencephalon
midbrain includes…
mesencephalon
hindbrain includes…
- metencephalon
- myelencephalon
forebrain functions
processes sensory information, reasoning/problem solving, automatic, motor functions
telencephalon
cerebral cortex divided into 4 major lobes
1. frontal
2. parietal
3. temporal
4. occipital
diencephalon
- connects endocrine with nervous system
- thalamus, hypothalamus, pineal gland
midbrain
- regulates movement, processes auditory and visual information
- connects forebrain to the hindbrain
2 main parts of the midbrain
- tectum
- paired cerebral peduncles
hindbrain functions
regulates autonomic functions, balance, equilibrium, relay of sensory information
metencephalon includes…
pons and cerebellum
myelencephalon includes…
medula oblongata
cerebrum: location
front area of skull, composed of 2 hemispheres (left/right)
cerebrum: function
- “thinking portion” of brain
- most complex cognitive functions
brainstem: location
- base of brain-cerebrum juncture + spinal cord
- midbrain, pons, and medulla
brainstem: function
automatic reflexes/vegetative functions (e.g., breathing, heart rate, etc.)
cerebellum: location
hangs off back of brainstem under occipital lobe
cerebellum: function
- voluntary movements
- balance, coordination, posture, attention
medulla: location
lower portion of brainstem, below pons
medulla: function
regulates respiration, heart rate + reflexes such as vomiting, swallowing
pons: location
middle portion of the brainstem
pons: function
attachment between cerebellum and rest of CNS
midbrain: location
upper (superior) most part of brainstem
midbrain: function
houses substantia nigra (production of neurotransmitter - dopamine)
basal ganglia: location
- deep within the cerebral hemispheres (either side of the thalamus)
- telencephalon
basal ganglia: function
fine-tunes voluntary body movements, motor coordination, posture
spinal cord: location
- housed within bony vertebral column
- PNS begins here
spinal cord: function
allows afferent impulses to transmit to brain + efferent from brain to body
thalamus: location
- top of brainstem
- core of diencephalon
thalamus: function
relay center for sensory signals, and also motor
hypothalamus: location
- below thalamus
- posterior to optic chiasm
hypothalamus: function
homeostasis, regulates hunger/thirst, pain/pleasure, anger/aggression
hippocampus: location
within inferior and medical section of temporal lobe
hippocampus: function
responsible for new memories, emotions, spatial navigation
amygdala: location
nuclei located within temporal lobes
amygdala: function
responsible for emotions, arousal, motivation
Heschl’s gyrus: location
Brodmann’s area 41
Heschl’s gyrus: function
auditory processing/sensory hearing area
angular gyrus: location
Brodmann’s area 39
angular gyrus: function
involved in semantic processing, language, and cognition
Broca’s area
- # 44
- motor speech area, speech production
Wernicke’s area
- # 22
- language comprehension area
- processing
primary visual area
- # 17
- visual processing area
primary sensory area
- # 1, 2, 3
- somatic sensations processing area
primary motor area
- # 4
- planning + execution of movements
left hemisphere
- language dominant hemisphere
- damage = aphasia
right hemisphere
- supporting language hemisphere
- damage = higher-order language and perceptual damage
frontal lobe
- primary motor area, controls executive function + motor
- Broca’s area (speech production), memory, attention, motivation
temporal lobe
- auditory processing and comprehension
- Wernicke’s area (language comprehension/processing), memory
parietal lobe
- sensory motor area
- spatial reasoning, math, reading, hearing, smell, taste, touch
occipital lobe
- visual area
- receives visual cues from opposite visual field, color identification
circle of willis
connects the internal carotid and vertebral/basilar system
anterior cerebral artery
extends upward and forward from internal carotid artery
anterior cerebral artery: blood supply
frontal and parietal lobes, basal ganglia, and corpus collosum
anterior cerebral artery: stroke in ACA
opposite leg weakness
middle cerebral artery
largest branch of internal carotid
middle cerebral artery: blood supply
Broca and Wernicke, temporal lobe, and primary motor cortex
middle cerebral artery: stroke in MCA
MCA is the artery that is most often occluded in a stroke
posterior cerebral artery
stem from basilar artery (in most people)
posterior cerebral artery: blood supply
occipital lobes, cerebellum, and inferior temporal
posterior cerebral artery: stroke in PCA
usually 2 to embolism from lower segments of vertebral heart
white matter
3 primary types in the CNS
1. association fibers
2. commissural fibers
3. projection fibers
association fibers
- intra hemispheric (within the same hemisphere)
- connect different regions of the cerebral cortex within same hemispheres
commissural fibers
- inter hemispheric (connects right and left hemispheres)
- interconnect identical and corresponding areas of 2 cerebral hemispheres
projection fibers
- fibers that leave cerebral white matter
- connect cerebral cortex to the brainstem and below
CN I
- olfactory
- sensory
- smell
- origin: cerebral hemispheres
CN II
- optic
- sensory
- vision
- origin: thalamus
CN III
- oculomotor
- motor
- pupil, eye movement
- origin: midbrain
CN IV
- trochlear
- motor
- eye movement (down and in)
- origin: midbrain
CN V
- trigeminal
- mixed
- somatic sensation: face, lips, and jaw
- muscles of mastication
- origin: pons
CN VI
- abducens
- motor
- eye movement (side and out)
- origin: pons
CN VII
- facial
- mixed
- taste: anterior 2/3 of tongue
- lips and facial movement, expression
- origin: pons
CN VIII
- vestibulocochlear
- sensory
- hearing and balance
- origin: pons, medulla
CN IX
- glossopharyngeal
- mixed
- taste: posterior 1/3 of tongue
- pharynx movement (superior portion)
- origin: medulla
CN X
- vagus
- mixed
- sensation of larynx, pharynx, abdominal muscles
- larynx, pharynx, and velum movement
- origin: medulla
CN XI
- accessory
- motor
- shoulder and neck muscles, also assists vagus nerve movement
- origin: medulla, spinal cord
CN XII
- glossopharyngeal
- motor
- tongue movement
- origin: medulla
6 cranial nerves important for speech
- CN V trigeminal
- CN VII facial
- CN IX glossopharyngeal
- CN X vagus
- CN XI acessory
- CN XII hypoglossal
CN V trigeminal: motor
- muscles of mastication
- elevation of hyoid and larynx
CN V trigeminal: sensory
- face sensation (forehead/cheek/chin)
- position of bolus in mouth/cheeks
- oral mucosa, teeth, and gums sensation
CN VII facial: motor
- facial expression muscles
- shape, motion, and seal of lips
- tone and movement of cheeks
- elevation of hyoid
CN VII facial: sensory
- taste sensation (anterior 2/3 tongue)
- face/oral cavity/soft palate sensation
- stimulates salivary glands
CN IX glossopharyngeal: motor
- stylopharyngeous muscle
- larynx/pharynx elevation
- pharyngeal constriction/shortening
CN IX glossopharyngeal: sensory
- taste sensation (posterior 1/3 tongue)
- stimulates parotid gland (saliva)
- gag reflex
CN X vagus: motor
- intrinsic laryngeal muscles
- velopharyngeal closure and approximation
- constriction of esophagus, peristalsis
- pharyngeal, superior, and recurrent
CN X vagus: sensory
- sensation of food residue in larynx, pharynx, and esophagus
- larynx, pharynx, external ear, trachea, esophagus, and diaphragm
CN XI accessory: motor
- sternocleidomastoid
- temporalis muscles
- velopharyngeal closure
- head turning, shoulder shrug
CN XII hypoglossal: motor
- innervates all intrinsic muscles of tongue and all but 1 extrinsic
- tongue motion, bolus preparation, removing food particles, bolus mix with saliva
- transporting bolus to pharynx
mastication muscles
group of 4 muscles responsible for chewing
elevator muscles
- masseter
- temporalis
- medial pterygoid
- masseter muscle
- connects mandible and cheekbone
- elevates mandible and closes the mouth
- temporalis muscle
- large, fan-shaped muscle
- retracts and elevates mandible, side to side movement
- medial pterygoid
- connects mandible with maxilla, sphenoid, and palatine bones
- elevates mandible and protrudes the jaw
- lateral pterygoid
- 2-headed muscle located in infra temporal fossa of skull
- depresses and protrudes mandible to open mouth
respiration
- gas exchange (CO2 out and O2 in)
- process of inspiration and expiration
lungs
porous, spongy organ of breathing located in thoracic cavity
skeletal structure
- vertebral column
- 7 cervical (neck), 12 thoracic (chest), 5 lumbar (abdomen), 5 sacral fused (lower back), 3-4 coccygeal fused (lower back)
vegetative breathing
goal of life is sustenance, automatic, and consistent
speech breathing
expiration more important than inspiration, speak on exhale
ventilation
the process of inspiration and expiration
process of inspiration
- air enters the lungs
- contraction of inspiratory muscles
- diaphragm contracts and pulls downward
- external intercostal muscles contract
- thoracic cavity expands
- air rushes into the lungs
process of inspiration: thoracic cavity expands
volume increases/pressure decreases (Boyle’s law)
process of inspiration: air rushes into the lungs
through nose/mouth, down pharynx (between vocal folds) –> down through trachea –> into the lungs
process of expiration
- air exits the lungs
- relaxation of inspiratory muscles
- diaphragm relaxes and rises
- internal intercostal muscles relax
- thoracic cavity collapses
- air rushes out of the lungs
process of expiration: thoracic cavity collapses
volume decreases/pressure increases (Boyle’s Law)
process of expiration: air rushes out of the lungs
lungs recoil, chest wall returns back to its original state, and air is expelled out of lungs
larynx
organ at the top of the neck involved in breathing, sound production, and aspiration prevention
regions of the larynx
- supraglottis
- glottis
- subglottis
supraglottis
area above the vocal folds
glottis
contains true vocal folds
subglottis
area below the vocal folds
unpaired cartilages of the larynx
- cricoid
- thyroid
- epiglottis
cricoid
- most inferior cartilage
- ring-shaped
thyroid
- laryngest cartilage
- Adam’s apple
epiglottis
- leaf shaped flap that covers glottis of the larynx during swallow
- protects airway during swallow
paired cartilages of the larynx
- arytenoid
- corniculate
- cuneiform
arytenoid
only paired major cartilage
corniculate
attach to apex of arytenoid cartilages
cuneiform
do not attach to any other cartilages
extrinsic muscles of the larynx
- suprahyoid
- stylopharyngeus
- infrahyoid
suprahyoid and stylopharyngeus
elevate larynx
infrahyoid
depress larynx
intrinsic muscles of the larynx
- posterior cricoarytenoid
- lateral cricoarytenoid
- transverse arytenoid
- oblique arytenoid
- cricothyroid
- thyroarytenoid
posterior cricoarytenoid
vocal fold abduction
lateral cricoarytenoid, transverse cricoarytenoid, oblique arytenoid, cricothyroid, and thyroarytenoid
vocal fold adduction
vocal folds
modulate the flow of air being expelled from the lungs during phonation
abduction
open
adduction
closed
muscles do not actually vibrate…
aerodynamic forces do - air pressure is primary force
3 pairs of vocal folds
- true vocal folds
- aryepiglottic folds
- ventricular (false) folds
vocal fold vibration (one complete cycle)
- vocal folds are adducted (closed), air pressure builds up below them
- as air pressure rises, bottom of folds are forced apart
- pressure then forces folds apart at middle, then at top, until air freely flows
- pressure decreases
- as pressure decreases, folds move toward midline (bottom first and top last)
aryepiglottic folds
- tips of arytenoids to the larynx
- separates laryngeal vestibule from pharynx
velopharyngeal closure
contraction of palatoglossus, tensor veli palatini, levator veli palatini
Bernoulli effect
- change in pressures that pull vocal folds together caused by Bernoulli effect
- speed of air increases and “sucks” vocal folds toward one another (closure of folds)
mucosal wave
- wave-like motion of the vocal fold cover
- necessary for vibration (phonation)
soft palate
- mobile flap of soft tissue
- elevated during swallow to prevent food from entering nasopharynx
pharynx
- part of digestive and respiratory systems
- connects nose, mouth, and throat
nasopharynx
- upper part of the pharynx
- connects nasal cavity and throat
oropharynx
- middle part of pharynx
- starts at soft palate and goes down to base of tongue
laryngopharynx
- lower part of the pharynx
- above larynx and below oropharynx