Tactile and Proprioception

1. The main purpose of proprioceptors is to convey info about body's position/location

True

False

2. Where do the dorsal column tract fibers decussate in the perceptual relay?

Spinal cord

Medulla

Pons

VPL

This tract has primary afferents synapse in the medulla and then immediately decussate (for sensory systems a genera rule is that once the primary afferents synapse, the immediately decussate)

Explanation

This tract has primary afferents synapse in the medulla and then immediately decussate (for sensory systems a genera rule is that once the primary afferents synapse, the immediately decussate)

3. The medial lemniscus ascends to the VPL of the thalamus

True

False

4. The nucleus gracilis receives info from the and the nucleus cuneatus receives info from the _

Face; body

Body; face

Lower body; upper body

Upper body; lower body

None of the above

5. Out of the 3 proprioceptors discussed in class, which has the largestt/fatest axons/conduction?

Muscle spindles

Golgi tendon organ

Joint receptors

Muscle Spindles have group Ia and II fibers. Group Ia has the largest axons and fastest conduction velocity

Explanation

Muscle Spindles have group Ia and II fibers. Group Ia has the largest axons and fastest conduction velocity

6. The back contains smaller receptive fields than the finger tips.

True

False

Areas that are most sensitive to touch will contain smaller receptive fields (finergtips) whereas areas that are less sensitive to touch will have larger receptive fields

Explanation

Areas that are most sensitive to touch will contain smaller receptive fields (finergtips) whereas areas that are less sensitive to touch will have larger receptive fields

7. The Jaw Jerk Reflex involves which muscle?

Sternocleidomastoid

Gluteus maximus

Zygomatic

Masseter

masseter muscle will close mouth

Explanation

masseter muscle will close mouth

8. For muscle and joint sense input to the cerebellum, the ultimate destination is:

Contralateral cerebelllar vermis

Ipsilateral cerebellar vermis

Bilateral cerebellar vermis

most fibers do NOT cross the midline

Explanation

most fibers do NOT cross the midline

9. For muscle and joint sense input to the cerebellum, the primary afferents will first synapse where?

Clarke's Nucleus

Lateral Cuneate Nucleus

Nucleus Gracillis

All of the above

2 of the above

First synapse in Clarke's (spinal cord)--> info from lower body (legs) -ALSO-
First synapse in Lateral Cuneate Nucleus (medulla)--> info from upper body (arms)

Explanation

First synapse in Clarke's (spinal cord)--> info from lower body (legs) -ALSO-
First synapse in Lateral Cuneate Nucleus (medulla)--> info from upper body (arms)

10. Pressure is faster adapting than vibration sense

True

False

pressure is slower to adapt

Explanation

pressure is slower to adapt

11. Pacinian Corpuscle is best at detecting constant pressure applied to the skin.

True

False

Pacinian corpuscle is best at detecting CHANGS in pressure

Explanation

Pacinian corpuscle is best at detecting CHANGS in pressure

12. What types of fibers do ALL specialized (touch) sensory endings have?

Group I

Group II

Group III

Group IV

13. Select the incorrect match.

Merkel cells; pressure detection

Meissner's corpuscle; fine, discriminative touch

Pacinian Corpusle; very sensitive to touch

Pacinian Corpuscle is sensitive to vibrations

Explanation

Pacinian Corpuscle is sensitive to vibrations

14. All muscle and joint receptors send input to the cerebellum

True

False

15. What is a unique feature of muscle and joint sense input to the cerebellum?

Only 2 cells in the pathway

Remains ipsilateral the entire way

None; this pathway follows the general pathway structure

Both a and b

16. What tract is involved in muscle and joint sense input to the cerebellum?

Cuneocerebellar

Spinothalamic

Spinocerebellar

Corticobulbar

A and c

B and c

Spinocerebellar Tract: info from lower body (leg) --> from Clarke's Nucleus
Cuneocerebellar Tract: info from upper body (arms) --> from Lateral Cuneate Nucleus

Explanation

Spinocerebellar Tract: info from lower body (leg) --> from Clarke's Nucleus
Cuneocerebellar Tract: info from upper body (arms) --> from Lateral Cuneate Nucleus

17. The blink reflex involves which cranial nerve?

Glossopharyngeal

Optic

Facial

Oculomotor

Facial Nerve (7) sends axons back to muscles in the eyelid (obicularis oculii) to close the lid when something gets too close to the eye

Explanation

Facial Nerve (7) sends axons back to muscles in the eyelid (obicularis oculii) to close the lid when something gets too close to the eye

18. Several dermatomes comprise a single receptive field

True

False

Several receptive fields comprise a single dermatome

Explanation

Several receptive fields comprise a single dermatome

19. In the spinal cord, information from the lower body is _ and info from upper body is _

Anterior; posterior

Medial; lateral

Lateral; medial

20. Central connections for the body for tactile and propriocepion involves which tract?

Dorsal Column Tract

Medial Lemniscus Tract

Corticopspinal Tract

Lateral Lemniscus Tract

More than one of the above

this was a trick question: this pathway is referred to both the Dorsal Column Tract and the Medial Lemniscus Tract

Explanation

this was a trick question: this pathway is referred to both the Dorsal Column Tract and the Medial Lemniscus Tract

21. Which of the following fibers are involve din joint receptors? (check all that apply)

Group Ia

Group Ib

Group II

Group III

Joint Receptors involve both group Ib and II

Explanation

Joint Receptors involve both group Ib and II

Submit

22. In the medulla, info from the lower body is _ and info from the upper body is __

Medial; lateral

Dorsal; ventral

Ventral; dorsal

Lateral; medial

23. For tactile and proprioception pathways for the face, primary affernts have cell bodies in:

Trigeminal Ganglion

VPM

Mesencephalic Nucleus

Facial motor nucleus

More than one of the above

Primary afferents in this pathway have cell bodies in trigeminal ganglion and also the mesencephalic nucleus (which is involved in jaw reflexes)

Explanation

Primary afferents in this pathway have cell bodies in trigeminal ganglion and also the mesencephalic nucleus (which is involved in jaw reflexes)

24. For tactile and proprioception pathways for the face, the second order fibers join the ____ tract which is located more _ than pain&temp fibers

Trigeminothalamic; ventral

Spinothalamic; dorsal

Spinothalamic; ventral

Trigeminothalamic; dorsal

25. For tactile and proprioception pathways for the face, the third order fibers ascent to the __________ of the postcenral gyrus.

Superior aspect

Inferior aspect

Lateral aspect

Dorsal aspect

26. For tactile and proprioception pathways for the face, the primary afferents synapse in the:

Spinal cord

Medulla

Pons

primary afferents synapse in Principal Sensory Nucleus in pons

Explanation

primary afferents synapse in Principal Sensory Nucleus in pons

27. In the pons, info from the lower body is _ and info from the upper body is__

Lateral; dorsal

Dorsal; lateral

Lateral; medial

28. For the perceptual relay of tactile and proprioception info, the first synapse is in the spinal cord

True

False

First synapse is in the spinal cord for REFLEXES ONLY!
-for the perceptual pathway the first synapse is in the medulla (dorsal column nuclei)

Explanation

First synapse is in the spinal cord for REFLEXES ONLY!
-for the perceptual pathway the first synapse is in the medulla (dorsal column nuclei)

29. Which of the following touch receptors is found in hairless skin (check all that apply)

Merkel's Discs

Meissner's Corpuscle

Free Nerve Endings

Hair Follicle Endings

Submit

Tactile and Proprioception

1. The main purpose of proprioceptors is to convey info about body's position/location

2.

What first name or nickname would you like us to use?

2. Where do the dorsal column tract fibers decussate in the perceptual relay?

3. The medial lemniscus ascends to the VPL of the thalamus

4. The nucleus gracilis receives info from the ______ and the nucleus cuneatus receives info from the _______

5. Out of the 3 proprioceptors discussed in class, which has the largestt/fatest axons/conduction?

6. The back contains smaller receptive fields than the finger tips.

7. The Jaw Jerk Reflex involves which muscle?

8. For muscle and joint sense input to the cerebellum, the ultimate destination is:

9. For muscle and joint sense input to the cerebellum, the primary afferents will first synapse where?

10. Pressure is faster adapting than vibration sense

11. Pacinian Corpuscle is best at detecting constant pressure applied to the skin.

12. What types of fibers do ALL specialized (touch) sensory endings have?

13. Select the incorrect match.

14. All muscle and joint receptors send input to the cerebellum

15. What is a unique feature of muscle and joint sense input to the cerebellum?

16. What tract is involved in muscle and joint sense input to the cerebellum?

17. The blink reflex involves which cranial nerve?

18. Several dermatomes comprise a single receptive field

19. In the spinal cord, information from the lower body is _______ and info from upper body is _______

20. Central connections for the body for tactile and propriocepion involves which tract?

21. Which of the following fibers are involve din joint receptors? (check all that apply)

22. In the medulla, info from the lower body is _____ and info from the upper body is ______

23. For tactile and proprioception pathways for the face, primary affernts have cell bodies in:

24. For tactile and proprioception pathways for the face, the second order fibers join the ________ tract which is located more _____ than pain&temp fibers

25. For tactile and proprioception pathways for the face, the third order fibers ascent to the __________ of the postcenral gyrus.

26. For tactile and proprioception pathways for the face, the primary afferents synapse in the:

27. In the pons, info from the lower body is _____ and info from the upper body is______

28. For the perceptual relay of tactile and proprioception info, the first synapse is in the spinal cord

29. Which of the following touch receptors is found in hairless skin (check all that apply)

4. The nucleus gracilis receives info from the and the nucleus cuneatus receives info from the _

19. In the spinal cord, information from the lower body is _ and info from upper body is _

22. In the medulla, info from the lower body is _ and info from the upper body is __

24. For tactile and proprioception pathways for the face, the second order fibers join the ____ tract which is located more _ than pain&temp fibers

27. In the pons, info from the lower body is _ and info from the upper body is__