Somatosensory Pathways

Question 0

The closest mechanoreceptors to the surface

Answer 0

Merkel’s Disc and Meissner Corpuscles

Question 1

Somatosensory information goes through the…

Answer 1

Dorsal Column - Medial Lemniscus Pathway

Question 2

Higher [Mechanoreceptors]

Answer 2

Meissner

Question 3

Fast adapting mechanoreceptors are

Answer 3

Meissner and Pacinian

Question 4

Smallest RF

Answer 4

Merkel

Question 5

Smaller Receptor Fields are Found in

Answer 5

Fingers and upper lip

Question 6

Nerve Territory vs Dermatome

Answer 6

NT = Area of skin that provides sensory information to a specific Nerve
Dermatome= Area of skin supplied by a nerve root

Question 7

then endings of the mechanoreceptors are free nerve fibres T/F

Answer 7

F, encapsulated by connective tissue

Question 8

where are located the gracile and cuneate fasciculli

Answer 8

Dorsal Funiculus

Question 9

how many neruons comprise the DC- ML pathway and from where to where they go

Answer 9

1 Mechanoreceptor to Cuneate/Gracile Nucleus (Lower medulla)

2 Lower medulla to Lateral Ventral Posterior Nuclei [Lateral VPN] (Thalamus)

3 Thalamus to Sensory Cortex

Question 10

neurons cross the midline at the level of the medulla via

Answer 10

Internal Arcuate Fibre

Question 11

at the level of the spine more medial equals more distal T/F

Answer 11

T, same at the cortex
but at the medulla is the other way around

Question 12

Most of the information received is analysed by which part of the cortex

Answer 12

Area 3b of the primary somatosensory cortex

Question 13

Most medial part of the somatosensory cortex is the 1 and the most lateral is the 2

Answer 13

1 Genitalia

2 Chin and lower lip

Question 14

Parts of the Dorsal Column - Medial Lemniscus Pathway

Answer 14

1 Dorsal Column

2 Dorsal Funiculus

3 Caudal Medulla (Gracile/Arcuate Nucleus)

4 Internal Arcuate Fibres

5 Medial Lemniscus Pathway

6 Ventral Posterolateral Nucleus of the Thalamus

7 Internal Capsule

8 Sensory Cortex

Question 15

Gracile Nucleus takes info from which level of the spinal cord and below

Answer 15

T7

Question 16

Up to what level does the spinal cord reaches

Answer 16

L1-L2
thus site for lumbar puncture is L3-L4

Question 17

H is the spinal cord is made of which type of matter

Answer 17

Grey

Question 18

which horn of the spinal cord is for somatosensory information

Answer 18

Dorsal Horn

Question 19

what are the 3 types of pathways found in the spinal cord

Answer 19

Ascending

Descending

Propiospinal

Question 20

Nociception travels within 1
Decussates at the level of 2

via the 3

Towards the 4

Answer 20

1 Dorsal Horn

2 (1/2) levels above or below

3 Anterior White Commissure

4 Anterolateral System

Question 21

Muscle spindles are not found in the

Answer 21

Extraocular muscles of the eye

Question 22

What are muscle spindles?

Answer 22

Terminal Neurons capsulated in connective tissue able to detect STRETCH

Question 23

What is a motor Unit?

Answer 23

Muscle Fibres inervated by 1 alpha motor Neuron

Question 24

Define Motor Neuron Pool

Answer 24

All the motor neurons that innervate 1 muscle

Question 25

Muscle spindles are innervated by

Answer 25

Gamma Motor neurons that gives them

Question 26

What type of sensory apparatus is in parallel with the muscle fibres

Answer 26

Muscle Spindles

Question 27

1 - Type of sensory organ found in the tendons of muscles

2 - WHat do they sense

Answer 27

1 - Golgi Tendon Organs

2 - Force