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Clinical Reflexes

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Topic updated on 06/29/16 9:41am

Somatic Reflexes
                                                   
Reflex Muscles involved Nerve root(s) Peripheral nerve
Achilles  Gastrocnemius, Soleus S1,2 Tibial
Babinski Toe extensors L4,5 / S1,2 Tibial
Patellar  Quadriceps femoris L3,L4 Femoral
Biceps  Biceps brachii C5,6 Musculocutaneous
Brachioradialis  Brachioradialis C6 Radial
Triceps  Triceps brachii C7,8 Radial
Cremaster Cremaster L1, 2 Genitofemoral

Cranial Reflexes
 
Reflex Function Afferent limb Efferent limb
Pupillary  Pupillary constriction CN II CN III
Corneal  Blink reflex in response to corneal touch CN V1 CN VII
Lacrimation Tearing in response to corneal touch CN V1 CN VII
Jaw Jerk Jaw closure when muscles are stretched CN V3 CN V3
Gag  Pharyngeal muscle contraction when pharynx is touched CN IX CN IX, X
Cough Irritant receptors (mechanical and chemical) respond to stimulus CN X CN X

 



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