1.
Pressure is faster adapting than vibration sense
Correct Answer
B. False
Explanation
pressure is slower to adapt
2.
What types of fibers do ALL specialized (touch) sensory endings have?
Correct Answer
B. Group II
3.
Select the incorrect match.
Correct Answer
C. Pacinian Corpusle; very sensitive to touch
Explanation
Pacinian Corpuscle is sensitive to vibrations
4.
Out of the 3 proprioceptors discussed in class, which has the largestt/fatest axons/conduction?
Correct Answer
A. Muscle spindles
Explanation
Muscle Spindles have group Ia and II fibers. Group Ia has the largest axons and fastest conduction velocity
5.
Which of the following fibers are involve din joint receptors? (check all that apply)
Correct Answer(s)
B. Group Ib
C. Group II
Explanation
Joint Receptors involve both group Ib and II
6.
The main purpose of proprioceptors is to convey info about body's position/location
Correct Answer
A. True
7.
Which of the following touch receptors is found in hairless skin (check all that apply)
Correct Answer(s)
A. Merkel's Discs
B. Meissner's Corpuscle
8.
Pacinian Corpuscle is best at detecting constant pressure applied to the skin.
Correct Answer
B. False
Explanation
Pacinian corpuscle is best at detecting CHANGS in pressure
9.
The back contains smaller receptive fields than the finger tips.
Correct Answer
B. False
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
10.
Several dermatomes comprise a single receptive field
Correct Answer
B. False
Explanation
Several receptive fields comprise a single dermatome
11.
Describe adapation and cells that are involved in both fast and slow adapation
12.
Central connections for the body for tactile and propriocepion involves which tract?
Correct Answer
E. More than one of the above
Explanation
this was a trick question: this pathway is referred to both the Dorsal Column Tract and the Medial Lemniscus Tract
13.
For the perceptual relay of tactile and proprioception info, the first synapse is in the spinal cord
Correct Answer
B. False
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)
14.
Where do the dorsal column tract fibers decussate in the perceptual relay?
Correct Answer
B. Medulla
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)
15.
The nucleus gracilis receives info from the ______ and the nucleus cuneatus receives info from the _______
Correct Answer
C. Lower body; upper body
16.
The medial lemniscus ascends to the VPL of the thalamus
Correct Answer
A. True
17.
In the spinal cord, information from the lower body is _______ and info from upper body is _______
Correct Answer
B. Medial; lateral
18.
In the medulla, info from the lower body is _____ and info from the upper body is ______
Correct Answer
C. Ventral; dorsal
19.
In the pons, info from the lower body is _____ and info from the upper body is______
Correct Answer
A. Lateral; dorsal
20.
For tactile and proprioception pathways for the face, the primary afferents synapse in the:
Correct Answer
C. Pons
Explanation
primary afferents synapse in Principal Sensory Nucleus in pons
21.
For tactile and proprioception pathways for the face, the second order fibers join the ________ tract which is located more _____ than pain&temp fibers
Correct Answer
D. Trigeminothalamic; dorsal
22.
For tactile and proprioception pathways for the face, the third order fibers ascent to the __________ of the postcenral gyrus.
Correct Answer
B. Inferior aspect
23.
For tactile and proprioception pathways for the face, primary affernts have cell bodies in:
Correct Answer
E. More than one of the above
Explanation
Primary afferents in this pathway have cell bodies in trigeminal ganglion and also the mesencephalic nucleus (which is involved in jaw reflexes)
24.
The blink reflex involves which cranial nerve?
Correct Answer
C. Facial
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
25.
The Jaw Jerk Reflex involves which muscle?
Correct Answer
D. Masseter
Explanation
masseter muscle will close mouth
26.
All muscle and joint receptors send input to the cerebellum
Correct Answer
A. True
27.
For muscle and joint sense input to the cerebellum, the primary afferents will first synapse where?
Correct Answer
E. 2 of the above
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)
28.
For muscle and joint sense input to the cerebellum, the ultimate destination is:
Correct Answer
B. Ipsilateral cerebellar vermis
Explanation
most fibers do NOT cross the midline
29.
What is a unique feature of
muscle and joint sense input to the cerebellum?
Correct Answer
D. Both a and b
30.
What tract is involved in
muscle and joint sense input to the cerebellum?
Correct Answer
E. A and c
Explanation
Spinocerebellar Tract: info from lower body (leg) --> from Clarke's Nucleus
Cuneocerebellar Tract: info from upper body (arms) --> from Lateral Cuneate Nucleus