Crossed extensor reflex.html

The crossed extensor reflex is a withdrawal reflex.

When the reflex occurs the flexors in the withdrawing limb contract and the extensors relax, while in the other limb the opposite occurs.

An example of this is when a person steps on a nail, the leg that is stepping on the nail pulls away, while the other leg takes the weight of the whole body.

Another example of a crossed extensor reflex is when someone violently grabs someone's arm, the arm that is grabbed retracts towards the body while the other arm moves towards the attacker for protection.

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v • d • e Nervous system physiology: neurophysiology - reflex

Cranial nerve	midbrain: Pupillary light reflex - Accommodation reflex pons/medulla: Jaw jerk reflex - Corneal reflex - Caloric reflex test/Vestibulo-ocular reflex/Oculocephalic reflex - Pharyngeal (gag) reflex

Tendon reflexes	upper limb: Biceps reflex C5/C6 - Brachioradialis reflex C6 - Extensor digitorum reflex C6/C7 - Triceps reflex C7/C8 lower limb: Patellar reflex L2-L4 - Ankle jerk reflex S1/S2 - Plantar reflex

Primitive reflexes	Galant - Gastrocolic - Grasp - Moro - Rooting - Stepping - Sucking - Tonic neck

Lists	general - alphabetical - by organ

Other	Baroreflex - Acoustic reflex - H-reflex - Oculocardiac reflex - Stretch reflex - Startle reaction - Optokinetic - Withdrawal reflex - Crossed extensor reflex

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