Lower Motor Neurons and Spinal Movement

Question 1

2 Sites of Sensory of Facial nerve (VII)

Answer 1

1. Anterior 2/3 of tongue
2. Touch behind ear

Question 2

Type _____ fibers are fatiguable, with low mitochondira, high forces, and High ATPase

Answer 2

2

Question 3

S3-S4 is Onuf’s nucleus, which innervates the _____ and the ______

Answer 3

Uretrhal and external anal sphincter (voluntary bathroom control)

Question 4

The Biceps and Brachioradialis reflexes are innervated by _____ through _______

Answer 4

C5- C6

Question 5

Triceps reflexes are controlled by the nerves _____ through _____

Answer 5

C7- C8

Question 6

Sternocleido turns opposite side of head and lifts shoulder with Upper trapezius. Both of these are innerved by Cranial Nerve _____

Answer 6

Accessory Nerve (XI)

Question 7

Sticking the tongue out tests cranial nerve _____

Answer 7

XII

(Tongue and Jaw follow lesion)

Question 8

Type II afferent neurons are responsible for ______ ______

Answer 8

Sustained reflexes

Question 9

Type _____ muscle fibers are Fatigue resistant, high mitochondria, with low forces, and low ATPase

Answer 9

1

Question 10

Knee-jerk reflex tests the nerves ______ through _____ and the spinal cord

Answer 10

L3- L4

Question 11

Werdnig Hoffman disease is the most common type of _____, with the key distinguishing presneation as “_____ ____”

Answer 11

• SMA
• Floppy Baby

Question 12

Lower motor neuron myelination vs Post-ganglionic Autonomic myelination

Answer 12

• The lower motor has the highest myelination and diameter
• Post-Gang has virtually no myelination

Question 13

Spinal Muscle Atrophy (SMA) is a group of progressive diseases caused by the degeneration of the _____ horns

Answer 13

Anterior

Question 14

Lifting the eyebrows and Smiling tests ______ nerve

Answer 14

Facial (VII)

Question 15

In regards to lower motor neurons, Motor neurons controlling axial muscles lie _____ to those controlling distal muscles

Answer 15

Medial

Question 16

Gamma-motor neurons increase the _____ of the muscle spindle

Answer 16

Excitability

Question 17

ALS differs from polio in that:

Answer 17

ALS affects both Lower and Upper motor neurons

Question 18

C3-C5 are motor neurons going to the _____ nerve, which controls the diaphragm

Answer 18

Phrenic

Question 19

The achillies reflex is controlled by the _____ nerve

Answer 19

S1

Question 20

Weakness, hyporeflexia, Fibrillations and Fasciculations are distinguishing signs of ____ ____ ___ syndrome

Answer 20

Lower Motor Neuron

Question 21

The 1a afferent neurons are responsible for ________

Answer 21

Dynamic Stretch reflexes

Question 22

The polio virus attacks ____ horn motor neurons, causing ______ syndrome

Answer 22

• Ventral
• Lower Motor Neuron

Question 23

The Gag reflex is sensed by _____ nerve; (easy mnemonic)

Answer 23

IX

(9GAG)

Question 24

Alpha motor neurons determine _____ _____ type

Answer 24

Muscle fiber (all muscle fibers within a motor unit are the same type)

Question 25

C1-C2 are the _____ _____, which are motor neurons to the trapezius and Sternocliedomastoid

Answer 25

Accessory nucleus

Question 26

In regards to lower motor neurons, the Flexors lie _____ to the Extensors

Answer 26

Dorsal

“Dolphins always flexin’”

Question 27

6 Cranial nerves with Lower motor neurons

Answer 27

• 5
• 7
• 9
• 10
• 11
• 12

Question 28

ALS vs Polio

Answer 28

• ALS affects both UMN and LMN (alls the nerves get affected)
• Polio is just LMN

Question 29

The Nucleus Ambiguus provides motor to CNs ____ and ____

Answer 29

IX and X