Anatomy And Assessment Flashcards
Make up of the central nervous system
Brain
Cerebrum
Cerebellum
Brain stem
Spinal Cord
Make up of the peripheral nervous system
12 pairs cranial nerves
31 pairs spinal nerves
Somatic nervous system
Autonomic nervous system
What does the somatic nervous system do?
Innervates voluntary muscle
What does the autonomic nervous system do?
Innervate visceral smooth muscle
What are the cerebral hemispheres?
Also called the cortex of cerebellum the hemispheres are:
Frontal
Parietal
Temporal
Occipital
Frontal lobes
Personality
IQ
Judgement
Attention Span
Moral/ Ethical Behavior
Long term memory
Voluntary movement
Motor speech
Inhibition
Parietal Lobes
Sensory interpretation
Calculation
Right/Left discrimination
Proprioception
Sensory speech
Temporal Lobes
Interpretation of sounds
Integration of taste and smell
Short term memory
Seizure focus
Occipital Lobes
Primary visual cortex
Visual interpretation
Basal ganglia structures
Caudate nucleus
Lentiform nucleus
Subthalmic nucleus
Globus pallidus
Role of the basal ganglia
Integration of movement
Sometimes referred to as the extra pyramidal motor system
Anterior pituitary gland hormones
Growth stimulating hormones
Adrenocorticotropic hormone
Thyroid stimulating hormone
Follicle stimulating hormone
Leutinizing hormone
Prolactin
Posterior pituitary hormones
Anti-diuretic hormone
Oxytocin
What is the optic chiasm part of?
Pituitary gland
Functions of the cerebellum
Reflexive control of muscle tone
Coordination
Equilibrium
Reticular activating system/ RAS
Located between the midbrain and medulla
Controls arousal/wakefulness
List the cranial nerves
- Olfactory
- Optic
- Oculomotor
- Trochlear
- Trigeminal
- Abducens
- Facial
- Acoustic
- Glossopharyngeal
- Vagus
- Accessory
- Hypoglossal
Cranial nerves located in the cerebral hemispheres
1 and 2
Cranial nerves located in the midbrain
3 and 4
Cranial nerves located in the Pons
5 through 8
Cranial nerves located in the medulla
9 through 12
Most common errors in neuro assessments
Inadequate baseline
Failure to recognize cues
Failure to recognize the significance of clues
Failure to go up the chain
Stimulus chain
Voice
Shout
Shake
Pain
Level of consciousness
Most sensitive indicator of chance
Components include wakefulness (RAS) and awareness (frontal)
Glasgow coma scale
Developed for assessment of consciousness in patients with head injury
Critical scores for the Glasgow coma scale
8- critical severity
Less than or equal to 8 six hours after injury- 50% mortality rate
9-11 moderate severity
12 and up minor injury
Lethargy
Slowness in movement, speech, and thought processes
Obtundation
Arousable to stimulation
Appears drowsy, few words, simple commands
Stupor
Minimal spontaneous movement
Eye opening or incomprehensible sounds to painful stimuli
No response without stimulation
Motor dysphasia
Also called expressive or non-fluent dysphasia
Frontal lobe
Defects in use of spoken word
Sensory dysphasia
Also called receptive or fluent dysphasia
Temporal/ Parietal lobes
Defect in understanding written or spoken word
Central pain
Used when no response to extremity pain
Trapezius squeeze, supraorbital pressure, or submandibular pressure
Weber
Tuning for in middle of head
Conductive hearing loss- lateralization to deaf ear
Sensorineural hearing loss- lateralization to good ear
Rinne
Tuning for to mastoid and time until sound no longer heard. Move to ear and time again. Air : Bone
Normal- 2:1
Conductive- bone> air
Sensorineural- air > bone
Assess cranial nerve I
Olfactory
Check for mucus, obstruction, or inflammation
One nostril at a time
Use non-irritating stimulants such as coffee or soap
Assess cranial nerve II
Optic nerve
Acuity
Visual fields
Pupils
Assess cranial nerve III
Oculomotor nerve
Pupil construction
Follow finger with eye
Lids should not dip to top of iris
Assess cranial nerve IV
Trochlear
Ability to move eyes down and in
Assess cranial nerve V
Trigeminal
Sensation on zones of face
Stroke cornea with cotton swab. Eye should close
Masseter and temporal muscle tone with jaw clenched
Assess cranial nerve VI
Abducens
Ability to move eyes direct laterally (to outward side)
Assess cranial nerve VII
Facial
Close lid, wrinkle brow, raise eyebrows, wiggle nose, pucker, show teeth, smile, puff out cheeks
Assess cranial nerve VIII
Acoustic
Balance
Assess hearing by rubbing or tapping fingers by ears
Weber and Rhine tests
Assess cranial nerves IX and X
Glossopharyngeal/ Vagus
Touch each side of palate and watch for prompt bilateral elevation
Check uvula is midline
Palate generated sounds ex: ”ka”/ “ga”
Ask patient to speak
Assess cranial nerve XI
Spinal accessory nerve
Turn chin against examiners hand and resist
Elevate both shoulders against examiner’s hands
Assess cranial nerve XII
Hypoglossal
Ask patient to stick out tongue and note any deviation
Ask pt to push tongue against cheeks against examiners hand
Tongue generated sounds ex: “la”
Anatomy of spinal column
33 vertebrae
7 cervical
12 thoracic
5 lumbar
5 sacral
4 coccygeal
Intervertebral discs between vertebrae
Connecting ligaments
Purpose of the spinal column
Provide basic structural support
Protect the spinal cord
Spinal nerves locations and root types
31 spinal cord segments
8 cervical
12 thoracic
5 lumbar
5 sacral
31 pairs of spinal nerve roots
Ventral/ Anterior root= motor
Dorsal/ Posterior root= sensory
Spinal cord basics
Begins at the foramen magnum
Comprised to white matter (nerve cell bodies) and gray matter (tracts)
Nerve cell bodies of the spinal cord
Butterfly shaped gray matter
Ventral/anterior horns are entry point for motor information to CNS
Dorsal/ posterior horns are entry point for sensory information to CNS
Spinal tracts
Myelin coated white matter
Motor and sensory tracts
5 major motor tracts and purpose
Corticospinal- voluntary movement medically to lateral=arms to legs
Rubrospinal
Reticulospinal
Vestibulospinal
Tectospinal
All 4 assist with reflexes, posture, and tone
4 major sensory tracts and purpose
Spinothalmic- pain touch and temperature input immediately cross over
Posterior Columns- proprioceptipn and vibrationipsilateral
Spinocerebellar- unconscious proprioception
Spinoreticular- deep pain
Spinal cord blood supply
Anterior spinal artery- supplies anterior two thirds
Posterior spinal artery- two of them supply primarily dorsal columns
Myotomes
Motor fibers or each nerve that supply and receive info in a specific muscle distribution
C5 motor fiber muscle and how to assess it
Deltoid- pronator drift
How to assess motor fiber of L2-3
Hip flexion (iliopsoas)
Dermatomes
Sensory fibers of each nerve that supply and receive in a specific skin distribution
Sensory exam
Done in the different dermatomes
Superficial pain-pinprick (spinothalmic)
Temp with alcohol pad (spinothalmic)
Proprioception- romberg test and finger tap (posterior columns)
Vibration (posterior columns)
Supratentorial compartment
Contains the cerebral hemispheres and diencephalon
Infratentorial compartment
Contains the cerebellum, pons, medulla, and part of the midbrain
Tentorium cerebelli
Separates the occipital lobes from the cerebellum
Transverse shelf-like membrane that attaches to skull
3 meningeal layers
Dura/ dura mater
Arachnoid
Pia/ pia mater
Dura
Thin inelastic inner layer (meningeal) and outer (periosteal) layer lining the inside of the skull and vertebral column forming a continuous membranous sac and separates the CNS and PNS
Epidural space
Space between the skull and dura
Falx cerebri
Double layer of dura that separates the left and right hemispheres
Falx cerebelli
Double layer of dura that separates the left and right cerebellar hemispheres
Tentorium cerebelli
Double layer of dura that separates the cerebellum from the cortex
The arachnoid layer
Thin, weblike, non vascular membrane between the dura and pia which is filled with CSF
Pia mater
Delicate membrane that covers the brain shielding surface vessels and exiting nerves
CSF pathway
Lateral ventricles
Intraventricular foramen/ foramen of Monroe
Third ventricle
Cerebral aqueduct/ Sylvian aqueduct
Fourth ventricle
Foramen of magendie and foramina of Luschka
Function of CSF
Provide buoyancy to reduce momentum and acceleration of the brain when the cranium is suddenly displaced
Lumbar makeup of CSF
Clear and colorless
70-180mm H2O
0-5 cells/ml
Protein: 15-45mg/dL
Glucose 50-75
Ventricular make up of CSF
Clear and colorless
79-190mm H2O
0-5 cells/ml
Protein: 5-15mg/dL
Nonprotein nitrogen 10-35
Production rate of CSF
0.357 ml/min
22 ml/hr
500 ml/day
Diencephalon
Composed of the thalamus and hypothalamus
Number 1
- Anterior cerebral artery
Number 2
- Anterior communicating artery
Number 3
- Middle cerebral artery
Number 4
- Internal carotid artery
Number 5
- Posterior communicating artery
Number 6
- Posterior cerebral artery
Number 7
- Superior cerebellar artery
Number 8
- Basilar artery
Number 9
- Anterior inferior cerebellar artery
Number 10
- Vertebral artery
Number 11
- Posterior inferior cerebellar artery
Number 12
- Anterior spinal artery
C5 and 6 muscle group and how to assess
Bicep- elbow flexion
C6 and 7 muscle group and how to assess it
Tricep- elbow extension
C8 muscle group and how to assess
Fingers - flexion of fingers
T1 motor fiber muscle group and how to assess
Fingers- finger extension and abduction
How to assess muscle fiber group L2-4
Hip adduction
How to assess muscle fiber group L4-S1
Hip abduction