Question

which type of reflex is being tested here (be as specific as possible)?

what is the name for the groove at the end of the arrow?

Explanation:

Identify the reflex test in the first image

The first image shows a clinical setting where an examiner is striking the area just below the patella (kneecap) of a seated subject using a reflex hammer, while the subject performs the Jendrassik maneuver (clasping hands together and pulling) to distract the central nervous system. This specific procedure is used to elicit the patellar reflex (also known as the knee-jerk reflex), which is a classic stretch reflex. Applying our understanding of a Neurological Examination, this is specifically the patellar reflex.

Identify the brain groove in the second image

The second image shows a lateral view of the human brain. The arrow points directly to the prominent groove (sulcus) that separates the frontal lobe from the parietal lobe. This major anatomical landmark is the central sulcus (or central groove), which separates the primary motor cortex (precentral gyrus) from the primary somatosensory cortex (postcentral gyrus).

Answer:

Question 1

Patellar reflex (or knee-jerk reflex)

Question 2

Central sulcus