Part 4 - Somatosensory & Vision Flashcards
Which is the dominant system:
Somatosensory
Vestibular
Vision
Somatosensory
What are the 4 components of the somatosensory system?
Muscle Fibres (length and strength) Golgi tendon organs (tension) Joint receptors Cutaneous receptors
Describe the somatosensory pathway (4 pieces)
Spinal cord (contralateral) Brainstem Thalamus Parietal Cortex
What are the 5 components of the visual system?
Eyes Visual tracts Thalamic nuclei Visual cortex Parietal and Temporal Lobes
What are the 4 Functional Levels of control of the Visual System?
Low Level
Middle Level
High Level
Repair
What does the visual system’s Low Level Control consist of?
Ocular Globe
Muscles
Nerves III, IV, and VI
Connections b/w nuclei
What is the visual system’s Middle Level Control responsible for?
Version
Vergence
Neural Integrator
What falls under the Visual System’s High Level of control?
Saccades Smooth Pursuit Optokinetic (OKN) Fixation VOR Suppression
What part of the visual system is in charge of repair?
Cerebellum
Name the 6 Extraocular Eye Muscles and their corresponding nerves
Oculomotor N - CN III: Superior rectus Medial rectus Inferior rectus Inferior oblique
Trochlear N - CN IV:
Superior oblique
Abducens N - CN VI:
Lateral rectus
Which of branch of the Oculomotor N (CN III) innervates the superior rectus?
The superior branch
All other CN III muscles innervated by inferior branch
The Medial Longitudinal Fasciculus (MLF) carries ocular and vestibular signals between the ______ and ______ to synchronize the lateral and medial recti
Medulla and Midbrain
Unilateral MLF lesions cause one eye to be unable to move medially, a condition known as what? (Hint: INO)
Internuclear Opthalmoplegia
