Tactile and Proprioceptive Senses

Question 1

what is another name for medial lemniscus tract?

Answer 1

dorsal column pathway

Question 2

fine discriminative touch requires what receptors

Answer 2

small receptors need surface

Merkel, Pinkus, Meissner

Question 3

vibration sense requires what receptors

Answer 3

Pacinian, some others

Question 4

list of specialized sensory endings (all have group II nerve fibers)

Answer 4

• hair shaft
• Merkel
• Meissner’s corpuscles (glabrous skin)
• Pacinian corpuscles
• Ruffini endings

Question 5

list of types of proprioceptors (muscle and joint senses)

Answer 5

• muscle spindles
• golgi tendon organs
• joint receptors

Question 6

muscle spindle proprioceptors have what category of receptors?

Answer 6

primary (1a) and secondary (II) endings

Question 7

of the proprioceptors, which has primarily larger (faster) axons

Answer 7

muscle spindles

Question 8

of the proprioceptors, which are almost as fast as primary spindles

Answer 8

Golgi tendon organs

Question 9

golgi tendon organs are to sense

Answer 9

muscle and tendon tension

Question 10

what group of endings is for Golgi tendon organs

Answer 10

group 1b

Question 11

what group of endings is for joint receptors

Answer 11

group 1b and II

Question 12

muscle spindles detect

Answer 12

muscle strength (length)

Question 13

joint receptors are for

Answer 13

position sense

Question 14

describe a receptive field

Answer 14

defined surface area of skin, can be mapped out on body surface as dermatomes

Question 15

what is adaptation determined by?

Answer 15

structure and electrical properties of ending

Question 16

even though transduction differs with receptor type, it is thought to occur by:

Answer 16

mechanical deformation of ion channel

Question 17

the _____ body information is more ventral in the medial lemniscus tract

Answer 17

lower

Question 18

nucleus gracilis is for the _____ body

Answer 18

lower

Question 19

nucleus cuneatus is for the _____ body

Answer 19

upper

Question 20

medial lemniscus ascends to the:

Answer 20

VPL of the thalamus

Question 21

as the info ascends through the medial lemniscus to the VPL, the _____ body is more lateral

Answer 21

lower

Question 22

the tactile and proprioception pathways for the face join the trigeminothalamic tract and are more ____ than the pain/temp fibers

Answer 22

dorsal

Question 23

jaw reflexes are from

Answer 23

some primary afferents having cell bodies in mesencephalic nucleus (of trigeminal) which participate in jaw reflexes

Question 24

for input to cerebellum, what information does Clarke’s relay? (in spinal cord)

Answer 24

info from lower body (leg)

Question 25

for input to cerebellum, what information does Lateral Cuneate relay? (in medulla)

Answer 25

info from upper body (arm)

Question 26

for cerebellar input, the Spinocerebellar tract is from ____ body

Answer 26

``` lower body (leg) T12 ```

Question 27

for cerebellar input, the Cuneocerebellar tract is from _____ body

Answer 27

``` upper body (arm) C4 ```

Question 28

what is unique about the muscle and joint sense input to the cerebellum?

Answer 28

- only 2 neurons in entire pathway - remains ipsilateral (no decussation) - does not participate in perception: info used for muscular coordination

Question 29

where does the input come from for muscle and joint sense to the cerebellum?

Answer 29

- all muscle and joint receptors | - some skin receptors (proprioceptors)