Postural and Primitive Reflexes Quiz

The resistance of a muscle to stretch.

A reflex that helps maintain posture by preventing unexpected movements.

A type of stretch reflex where the muscle is quickly stretched, triggering a fast contraction.

A type of stretch reflex where the muscle is held in a stretched position, triggering a sustained contraction. Helps maintain posture.

Tiny motor neurons that control the sensitivity of muscle spindles.

The coordinated activation of both alpha and gamma motor neurons, ensuring muscle contraction and spindle tension.

A condition where reflexes are exaggerated, resulting in increased muscle tone. Seen in upper motor neuron lesions.

A condition where reflexes are reduced, resulting in decreased muscle tone. Seen in lower motor neuron lesions.

The way the body is positioned while standing or sitting, maintaining an upright, balanced stance and providing a stable base for movements.

Muscles responsible for maintaining posture, including those in the trunk and limbs.

Neural pathways in the brain, brainstem, and spinal cord that control posture and movement.

A network of neurons in the brainstem that plays a crucial role in regulating muscle tone and posture.

A pathway that transmits excitatory signals to axial muscles, increasing their activity.

A pathway that transmits inhibitory signals to axial muscles, counteracting excitatory signals.

Descending pathways that control the muscles for fine, precise movements in the limbs.

Descending pathways that control the axial muscles involved in posture and balance.

Reflexes that control posture and balance. They are initiated by stretch receptors in muscles and vestibular system (inner ear).

A reflex that helps maintain posture and muscle tone by responding to stretching of the muscle. The stretch activates sensory receptors, which send signals to the spinal cord, triggering a muscle contraction.

A reflex that controls posture by adjusting muscle tone based on the position of the head relative to the body. This reflex helps maintain a stable head position.

A reflex that helps maintain posture by adjusting muscle tone based on the position of the head relative to horizontal plane. It ensures that the body remains upright even when the head is tilted.

A reflex that helps restore posture after a change in body position. The body moves back to the original position.

A type of brain injury that affects the upper motor neurons, responsible for voluntary movement. This can lead to increased muscle tone, spasticity, and exaggerated reflexes.

A type of brain injury that affects the lower motor neurons, responsible for transmitting signals from the central nervous system to muscles. This can lead to decreased muscle tone, weakness, and loss of reflexes.

Abnormal postures seen in patients with brain injuries.

• Decerebrate posture: arms are extended, rotated internally, and rigid; legs are extended, and rigid.
• Decorticate posture: arms are flexed, elbows and wrists are bent; legs are extended.