Kneecap

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Possible Answers:

PATELLA.

Last seen on: –LA Times Crossword 13 Sep 21, Monday
Universal Crossword – Feb 10 2021
The Telegraph – QUICK CROSSWORD NO: 29,378 – Jun 1 2020
LA Times Crossword 6 Aug 19, Tuesday

Random information on the term “Kneecap”:

The patellar reflex or knee-jerk (myotatic) (monosynaptic) (American spelling knee reflex) is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord.

Striking of the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L3 in the spinal cord, completely independent of higher centres. From there, an alpha motor neuron conducts an efferent impulse back to the quadriceps femoris muscle, triggering contraction. This contraction, coordinated with the relaxation of the antagonistic flexor hamstring muscle causes the leg to kick. This is a reflex of proprioception which helps maintain posture and balance, allowing to keep one’s balance with little effort or conscious thought.

The patellar reflex is a clinical and classic example of the monosynaptic reflex arc. There is no interneuron in the pathway leading to contraction of the quadriceps muscle. Instead, the bipolar sensory neuron synapses directly on a motor neuron in the spinal cord. However, there is an inhibitory interneuron used to relax the antagonistic hamstring muscle (Reciprocal innervation).

Kneecap on Wikipedia