Assessing the Neurological System and Mental Status Examination Flashcards
2 main parts of Nervous System
Central Nervous System and Peripheral Nervous System
carries messages to and from the CNS
Peripheral Nervous System
Central Nervous System inlcudes:
brain and spinal cord
connects brain and Peripheral Nervous System
spinal cord
Peripheral Nervous System includes:
Somatic Nervous System and Autonomic Nervous System
controls voluntary muscles and transmits sensory information to the CNS
Somatic Nervous System
controls involuntary body functions
Autonomic Nervous System
Autonomic Nervous System includes:
Sympathetic Nervous System and Parasympathetic Nervous System
arouses body to expend energy
Sympathetic Nervous System
calms body to conserve and maintain energy
Parasympathetic Nervous System
Four lobes
Frontal
Parietal
Temporal
Occipital
he cerebrum is divided into two halves:
the right and left hemispheres
The the right and left cerebral hemispheres are joined by the
corpus callosum
aggregation of neuronal cell bodies
Gray Matter
mediates higher-level function (memory, perception,
communication, initiation of voluntary movements)
Gray Matter
Regulate emotional expression, behavior, intellect;
influence personality; control voluntary movement
Frontal Lobe
Perceives and interpret sensory inputs such as pain,
temperature, touch, texture, and proprioception
Parietal Lobe
Influence hearing, smell, taste, and memory
Temporal Lobe
Perceive and interpret visual stimuli, including spatial relationships; Influence the ability to read with
understanding
Occipital Lobe
Clusters multiple stimuli into a coherent whole before sending it to the cerebral cortex for perception
Thalamus
Regulates production of several hormones responsible for regulating water balance, appetite, vital signs, sleep cycles, pain perception, and emotional status; Stimulates visceral
responses such as heart rate, in response to emotions; Regulates temperature by prompting shivering and sweating
Hypothalamus
Regulates visual, auditory, and other reflexes and controls eye movements, focusing, and pupil dilation
Midbrain
Helps control respiratory function, facial movement and sensation, and eye movement
Pons
Regulates heart and respiratory rate, BP, and protective reflexes such as swallowing, vomiting, sneezing, and coughing
Medulla Oblongata
parts of Brainstem
Midbrain
Pons
Medulla Oblongata
Coordination and smoothing of voluntary movements, maintaining equilibrium, and maintenance of muscle tone
Cerebellum
spinal cord is located in the
vertebral canal
Extends from the medulla oblongata to the first lumbar vertebra (L1)
spinal cord
Conducts sensory impulses up the ascending tracts to the brain
spinal cord
Conducts motor impulses down the descending tracts to neurons that stimulate glands and muscles throughout the body
spinal cord
Responsible for simple reflex activity
spinal cord
Conducting or conducted towards the brain
Afferent
Conducting or conducted away from the brain
Efferent
SAME DAVE
Sensory Afferent Motor Efferent
Dorsal Afferent Ventral Efferent
Sensations of pain, temperature, and crude an light touch
travel by the way of the
spinothalamic tract
Sensations of position, vibration and fine touch travel by way of the
posterior columns
Impulses from the afferent fibers of the peripheral nerves are carried through the
posterior root ganglion
Pyramidal Tracts
- Motor neurons original in the motor cortex and travel down the medulla
- Crosses over to the opposite side then travel down the spinal cord
- Impulses are carried to muscles and produce voluntary movements
control voluntary skilled movement of the extremities and
fine movement of the fingers
Corticospinal tracts
voluntary control of face, head, and neck
Corticobulbar tract
Responsible for INVOLUNTARY control and modulation like
tone and balance
Extrapyramidal Tracts
Extrapyramidal Tracts originate in the
brainstem
Responsible for fine motor control
Rubrospinal tract (midbrain)
Reticulospinal tract includes
Pons and Medulla
facilitates contraction and increases tone
Pons
Pyramidal Tracts divides into the:
- Corticospinal tracts
- Corticobulbar tract
inhibits contraction, decreases tone, and automatic breathing
Medulla
Involved in balance and posture
Vestibulospinal tract
Involved in the coordinate head and eye coordination
Tectospinal (Colliculospinal) tract
Extrapyramidal Tracts
- Rubrospinal tract
- Reticulospinal tract
- Vestibulospinal tract\
- Tectospinal (Colliculospinal) tract
CRANIAL NERVES
Olfactory
Optic
Oculomotor
Trochlear
Trigeminal
Abducens
Facial
Vestibulocochlear (Acoustic)
Glossopharyngeal
Vagus
Spinal Accessory
Hypoglossal
Carries smell impulses from nasal mucous membrane to brain
I - Olfactory Nerve
Carries visual impulses from eye to brain
II - Optic Nerve
Contracts eye muscles to control eye movements (superolateral, superomedial, inferolateral, and medial), constricts pupils, and elevates eyelids
III - Oculomotor Nerve
Contracts superior oblique muscle to control inferomedial eye movement
IV - Trochlear Nerve
3 divisions of Trigeminal Nerve:
Ophthalmic, Maxillary, and Mandibular
Chewing and jaw opening and clenching
Trigeminal Nerve
Conveying sensory data from eyes (cornea), nose, mouth, teeth, jaw, forehead, scalp, and facial skin
Sensory
Controls lateral eye movements
VI - Abducens Nerve
LR6SO4
Lateral rectus, CN VI
Superior Oblique, CN IV
Closing eyes, closing mouth, moving lips and other muscles of facial expression, salivation and lacrimation
VII - Facial Nerve
Tasting on anterior tongue
VII - Facial Nerve
Branches of Facial Nerve
Temporal, Zygomatic, Buccal, Mandibular, Cervical
Contains sensory fibers for hearing and balance
VIII – Acoustic/Vestibulocochlear nerve
Hearing Pathways
Conductive phase
Sensorineural phase
from the external ear through the middle ear
Conductive phase
Hearing disorders of the external ear causes include
- cerumen impaction
- trauma
- tumor
- bony growths
Hearing disorders of the middle ear causes include
- otitis media
- congenital conditions,
- cholesteatomas and otosclerosis
- tumors
- perforation of the tympanic membrane
involves the cochlea and cochlear nerve
Sensorineural phase
Hearing disorders of the inner ear causes include
- congenital and hereditary conditions
- presbycusis
- viral infections
- Meniere disease
- noise exposure
- ototoxic drug exposure
- acoustic neuroma
Contains sensory fibers for taste on posterior third of tongue and sensory fibers of the pharynx that result in the gag reflex when stimulated
IX - Glossopharyngeal Nerve
Provides secretory fibers to the parotid salivary glands;
promotes swallowing movements
IX - Glossopharyngeal Nerve
Carries sensation from the throat, larynx, heart, lungs, bronchi, gastrointestinal tract, and abdominal viscera
X - Vagus Nerve
Promotes swallowing, talking, and production of digestive juices
X - Vagus Nerve
Innervates neck muscles (sternocleidomastoid and
trapezius) that promote movement of the shoulders and head rotation. Also promotes some movement of the larynx
XI – Spinal Accessory Nerve
Innervates tongue muscles that promote the movement of food and talking
XI – Hypoglossal Nerve
how many pairs of spinal nerves?
31 pairs (8 cervical, 12 thoracic, 5 sacral, 1 coccygeal)