Motor 2: Polysynaptic Reflexes

Question 1

describe the mechanism of withdrawl effect

Answer 1

• Receprocal Innervation: flexor muscle is stimulated & extensor muscle is inhibit, to elevate leg from danger on the floor
• Crossed extensor Reflex: stimulation of extensor at opposite limb, other leg extends to give support when elevating hurt leg

Question 2

Describe superficial Abdomenal Reflex

Answer 2

• Using a blunt object on the abdomen, underlying abdomenal muscles contract
• Abdomenal Muscles are supplied by T7-T12
• Reflex used to localise site of lesion in spinal cord

Question 3

In planter reflex, blunt object is ran on

Answer 3

Lateral aspect of foot

Question 4

Planter flextion is supplied by

Answer 4

L5, S1,S2

Question 5

Abdnormaliy of panter reflex

Answer 5

• failure of planter flexion
• Leads to Fanning (+babinski sign)
• Lesion in L5,S1,S2

Question 6

Center of cremastric reflex

Answer 6

L1-L2

Question 7

Mechanism of positive supporting reflex

Answer 7

Contraction of both flexor and extensor muscles of the leg, creating a rigid column to support bodyweight

Question 8

Visceral Reflex include

Answer 8

• Defecation
• Micturation
• Erection