Question

Reviewing Your Knowledge 19 A. Reflex Arc Name de 5 e of eeanin monosynapric reflex arc 2 How many meuns are in a How many aynases are in the integrating center" tHow many neuroms ane in a polysynapeie reflex anc? How many ymapses are in a polysynaptic reflex are containing two intermcurons in the integrading center? 4 Which tpe of neuroe does the sensory neuron synapse with in a monosynaptic reflex are" & Which type of neuron does the sensory neuron symapse with in a polysynaptic reflex arc? B. Reflex Tests Name the nerve that is tested in each of the following reflexes I. Achilles reflex 2. Biceps reflex 3. Patellar reflex 4. Plantar flexion reflex 5. Triceps reflex 6. Is a Babinski's sign normal in adults?

Answer 1

1. 5 components of reflex arc

• Somatic receptor
• Afferent neuron
• Integrating center
• Efferent neuron
• Effector muscle

2. Monosynaptic reflex have

• 2 neuron - afferent and efferent
• 1 synapse

3. Polysynaptic reflex have

• More than 2 neuron - afferent neuron, interneuron and efferent neuron
• 2 of more synapse - one between afferent and interneuron; other between interneuron and efferent neuron

4. Sensory or afferent neuron synapse with efferent or motor neuron in monosynaptic reflex.

5. In polysynaptic reflex it synapse with interneuron

6. Nerve tested in reflex

• Achillies reflex - medial popliteal nerve
• Biceps - musculocutaneous nerve
• Patellar - femoral nerve
• Triceps - radial nerve

7. No, Babinski sign or extensor plantar response is not normal in adult.

• Normal plantar response - great toe will flex at metatarsophalangeal joint, accompanied by flexible of other toes
• Babinski sign - seen in prison of corticospinal tract.

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