Exam 1 Flashcards
(216 cards)
What is the fasciculus cuneatus (posterior or dorsal column) tract?
- Sensory
- For trunk, neck, and UE proprioception, vibration, two-point discrimination, and graphesthesia
- Cross in brainstem
What is the fasciculus gracilis (posterior or dorsal column) tract?
- Sensory
- For trunk and LE proprioception, two-point discrimination, vibration, and graphesthesia
- Cross in brainstem
What is the spinocerebellar tract (dorsal)?
- Sensory
- Tract ascends to cerebellum
- Ipsilateral subconscious proprioception, tension in muscles, joint sense, and posture of trunk and LE
What is the spinocerebellar tract (ventral)?
- Sensory
- Ascends up to cerebellum with crossing and recrossing at the pons
- Ipsilateral subconscious proprioception, muscle tension, joint sense, and posture of trunk, UE, and LE
What is the spino-olivary tract?
- Ascend to cerebellum
- Relay info from cutaneous and proprioceptive organs
What is the spinoreticular tract?
- Afferent pathway for reticular info that influences levels of consciousness
- Located next to lateral spinothalamic tract
What is the spinotectal tract?
- Sensory
- Provides afferent info for spinovisual reflexes and assists with the movement of the eyes and head towards a stimulus
What is the anterior spinothalamic tract?
- Sensory
- Light touch and pressure
- Cross at level of entry to SC or 1-3 levels above
What is the lateral spinothalamic tract?
- Sensory
- Pain and temp sensation
Where do sensory tracts originate from?
- Cells of spinal ganglia
- Intrinsic neurons within gray matter
What are descending tracts responsible for?
- Motor function
- Mm tone
- Reflexes
- Equilibrium
- Visceral innervation
- Modulation of ascending sensory signals
Where do smaller descending tracts originate from?
- Nuclei in the midbrain, pons and medulla
What is the lateral corticospinal tract?
- Pyramidal motor
- Voluntary fine motor movement
- Thought that it controls more distal parts
What happens if there is damage to the lateral corticospinal tract?
- Positive Babinski
- Absent superficial ab reflex
- Cremasteric reflex
- Loss of fine motor or skilled voluntary movement
What is the anterior corticospinal tract?
- Pyramidal motor
- Ipsilateral voluntary, discrete, and skilled movements
- Thoughts that it controls the more proximal parts
What is the reticulospinal tract?
- Extrapyramidal motor tract
- Facilitation or inhibition of voluntary and reflex activity through influence of alpha and gamma motor neurons
What is the rubrospinal tract?
- Extrapyramidal motor tract
- Motor input of gross postural tone, facilitate activity of flexor muscles, and inhibit extensor muscles
- Originate in red nucleus (midbrain) and crosses immediately
What is the tectospinal tract?
- Extrapyramidal motor tract
- Contralateral postural muscle tone associated with auditory/visual stimuli
- Cross in midbrain
What is the vestibulospinal tract?
- Extrapyramidal motor tract
- Ipsilateral gross postural adjustments subsequent to head movements
- Facilitate extensor muscles and inhibit flexors
What happens if there is damage to the extrapyramidal tracts?
- Significant paralysis
- Exaggerated DTR
- Clasp-knife reaction
What is the interhemispheric fissure?
- AKA medial longitudinal
- Separate two hemispheres
What is the Sylvian fissure?
- Anterior
- Separates temporal and frontal lobes and temporal from parietal
What is the central sulcus?
- Sulcus of Rolando
- Separate frontal and parietal lobes laterally
What is the calcarine sulcus?
- Separate occipital lobe into superior and inferior halves