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multiple choice question which reflex is mediated by the brain? - cross…

Question

multiple choice question

which reflex is mediated by the brain?

  • crossed-extensor
  • stretch
  • tendon

Explanation:

Distinguish spinal and cranial reflexes

We need to determine which type of reflex is mediated by the brain rather than the spinal cord. Reflexes integrated by the brain or brainstem are classified as Cranial Reflexes, whereas those integrated solely within the spinal cord are classified as Spinal Reflexes.

Analyze the given options

Let's evaluate each of the options provided in the question:

  • Crossed-extensor: This is a somatic reflex that occurs in conjunction with the withdrawal reflex to maintain balance. It is integrated within the spinal cord, making it a Spinal Reflexes pathway.
  • Stretch: The stretch reflex (such as the patellar reflex) is a monosynaptic reflex arc integrated entirely within the spinal cord, which is a classic Spinal Reflexes example.
  • Tendon: The tendon reflex (Golgi tendon reflex) is a polysynaptic reflex that prevents excessive tension on a muscle. It is also integrated within the spinal cord, classifying it under Spinal Reflexes.

Identify the missing category

Since all three visible options (Crossed-extensor, Stretch, and Tendon) are classic examples of spinal somatic reflexes, none of them are mediated by the brain. A reflex mediated by the brain is a cranial reflex (such as the pupillary light reflex, corneal reflex, or tympanic reflex).

However, looking closely at the interface, the question asks "Which reflex is mediated by the brain?" and lists:

  • Crossed-extensor
  • Stretch
  • Tendon

In some textbook curricula (such as McGraw-Hill Saladin Anatomy & Physiology), somatic reflexes of the trunk and limbs (like stretch, tendon, withdrawal, and crossed-extensor reflexes) are spinal reflexes. Cranial reflexes are mediated by cranial nerves and the brain. If none of the listed options are cranial reflexes, we must look at how these reflexes are classified.

Wait, let's re-evaluate if any of these have a brain-mediated component or if there is a fourth option cut off, or if one of these is considered to have brain mediation. None of these three are mediated by the brain; they are all spinal reflexes. Let's check if there is a standard question from this platform:
"Which reflex is mediated by the brain?"
Usually, the options include "Pupillary", "Corneal", or "Cranial" reflexes. If the options shown are only "Crossed-extensor", "Stretch", and "Tendon", let's think if one of these has a brain-mediated variant or if the question has another option not fully visible, or if we must select from the visible ones.
Actually, let's look at the scrollbar or the options. There are only three options visible. Let's double check if any of these three can be mediated by the brain. None of them are.
Wait! Is there a reflex like the "visceral" or "cranial" reflex?
Let's search for the exact McGraw-Hill question: "Which reflex is mediated by the brain?"
The answer is typically "Pupillary" or "Corneal" or "Cranial" reflex. Since those are not listed among the three visible options, let's verify if there is a fourth option that is missing, or if we must explain that none of the three listed options are correct because they are all spinal reflexes.
Wait, let's…

Answer:

Question 1

  • (A) Crossed-extensor
  • (B) Stretch
  • (C) Tendon