System Structure: Sensory - Massage and Bodywork Licensing Examination Mblex

1. Which cutaneous receptor is most associated with sustained pressure and skin stretch?

   Ruffini ending (bulbous corpuscle). Tonic receptors in the dermis sustain firing to monitor continuous deformation.

2. What is the name of the gap between adjacent myelin segments on an axon?

   Node of Ranvier. These gaps allow ion exchange for action potential propagation in myelinated nerves.

3. Which type of sensory receptor detects chemical changes (for example, smell and taste)?

   Chemoreceptor. They respond to molecular concentrations, facilitating senses like olfaction and gustation.

4. What is the main effect of myelin on nerve impulse conduction?

   Increases conduction speed via saltatory conduction. Myelin insulates axons, enabling action potentials to jump between nodes for faster transmission.

5. Which cutaneous receptor is most associated with hair movement and light touch?

   Hair root plexus (hair follicle receptor). Nerve endings around follicles detect deflection for sensitive touch detection.

6. Which structure in the eye controls the amount of light entering through the pupil?

   Iris. Smooth muscle in it adjusts pupil size via constriction or dilation for optimal light entry.

7. Which lobe of the cerebral cortex contains the primary somatosensory cortex?

   Parietal lobe (postcentral gyrus). This area processes somatosensory input for touch, pain, and temperature perception.

8. Which receptor in skeletal muscle detects changes in muscle length (stretch)?

   Muscle spindle. Intrafusal fibers within it monitor elongation to prevent overstretching via reflex arcs.

9. Which type of sensory receptor detects touch, pressure, vibration, and stretch?

   Mechanoreceptor. These receptors transduce mechanical deformation into neural signals for tactile and proprioceptive information.

10. Which type of sensory receptor detects light?

    Photoreceptor. Rods and cones in the retina convert light energy into electrical signals for vision.

11. Which cutaneous receptor is most associated with light touch and low-frequency vibration?

    Meissner corpuscle (tactile corpuscle). Encapsulated in dermal papillae, it rapidly adapts to stimuli for fine discrimination.

12. What is the primary function of the motor nervous system (efferent division)?

    Carries motor output from the central nervous system to effectors. Efferent neurons convey commands from the CNS to muscles and glands to elicit actions.

13. Which receptor in tendons detects changes in muscle tension?

    Golgi tendon organ. It senses force at musculotendinous junctions to inhibit contraction and protect against overload.

14. What is proprioception?

    Awareness of joint position and muscle tension. It provides subconscious feedback on body position for balance and coordinated movement.

15. What is the term for the minimum stimulus strength required to trigger an action potential?

    Threshold. It represents the membrane potential level at which voltage-gated sodium channels open to initiate depolarization.

16. Which inner ear structures detect angular acceleration (rotational movement)?

    Semicircular canals. Fluid movement in these ducts stimulates hair cells for detecting head rotation.

17. Which division of the peripheral nervous system contains sensory and motor nerves?

    Somatic nervous system. It innervates skeletal muscles for voluntary movement and receives sensory input from skin and joints.

18. Which type of sensory receptor detects temperature changes?

    Thermoreceptor. Specialized endings detect heat or cold, enabling thermoregulation and environmental adaptation.

19. Which inner ear structures detect linear acceleration and head position relative to gravity?

    Otolith organs: utricle and saccule. Otoliths shift with gravity or motion, bending hair cells for equilibrium sensing.

20. Which cutaneous receptor is most associated with deep pressure and high-frequency vibration?

    Pacinian corpuscle (lamellated corpuscle). Deep in the dermis, its layered structure filters vibrations for texture perception.

21. What is the primary function of the thalamus in sensory processing?

    Relay station routing most sensory input to the cerebral cortex. It filters and directs ascending sensory pathways, modulating signals before cortical processing.

22. Which type of sensory receptor detects tissue damage and pain?

    Nociceptor. These free nerve endings respond to harmful stimuli, signaling potential injury to promote protective responses.

23. Which division of the peripheral nervous system regulates involuntary visceral functions?

    Autonomic nervous system. It maintains homeostasis by controlling smooth muscle, cardiac muscle, and glands without conscious effort.

24. What is the primary function of the sensory nervous system (afferent division)?

    Carries sensory input from receptors to the central nervous system. Afferent neurons transmit signals from peripheral receptors to the CNS for integration and response.

25. What are the three connective tissue layers of a peripheral nerve from outer to inner?

    Epineurium, perineurium, endoneurium. These layers provide protection, support, and organization to nerve fascicles and individual axons.

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