Sensory Receptors 2 Flashcards
Name 3 proprioceptors:
Muscle spindles
Golgi tendon organs
Joint receptors
What do Muscle Spindles measure?
Monitor muscle length and rate of change of muscle length so they control reflexes/voluntary movement
What do Golgi tendon organs monitor?
Monitor tension on tendons (tension produced by muscle contraction so essentially measuring muscle tension)
Joint receptors monitor?
mONITOR Joint angle, rate of angular movemtn and joint tension.
What 3 things do proprioceptors transmit sensory info for?
controlling voluntary movement
spinal cord reflexes
percieving limb/body position and movement in space (Kinaesthesia)
What is a muscle spindle?
Speclised intrafusal muscle fibres contained within a capsule
How ae muscle spindles arranged withinm muscle?
In amongst extrafusal fibres, running parallel to them
Do intrafusal muscle fibres contain myofibrils?
Only the ends do not the centre
What type of motor neurons innervate muscle spindles?
Gamma motor neurons
What type of motor neurons innervate extrafusal fibers?
alpha motor neuons
From what part of an intrafusal muscle fibre do sensory neruons emerge?
The central (lacking myofibriles) section
What makes up golgo tendon organs?
Collagen fibre
Sensory neurons
A capsule
What makes up the capsules around muscle spindles and golgi tendon organs?
Connective tissue
What different groups of afferent neurons emerge from muscle spindles?
Groups I & II
What are nuclear bag fibres?
A type of intrafusal fibre
Theyre bag shaped with nuclei gethered together