| Bezold-Jarisch reflex | A reflex with afferent and efferent pathways in the vagus, originating in unidentified chemoreceptors in the heart and resulting in sinus bradycardia, hypotension, and probable peripheral vasodilation. (05 Mar 2000) |
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| biceps femoris reflex | Contraction of the biceps femoris upon tapping its lower part, just above its attachment to the head of the fibula, while the limb is partly flexed at hip and knee. (05 Mar 2000) |
| biceps reflex | Contraction of the biceps muscle when its tendon is struck. (05 Mar 2000) |
| Bing's reflex | When the foot is passively dorsiflexed, plantar flexion occurs if any point on the ankle between the two malleoli is tapped. (05 Mar 2000) |
| bladder reflex | Contraction of the walls of the bladder and relaxation of the trigone and urethral sphincter in response to a rise in pressure within the bladder; the reflex can be voluntarily inhibited and the inhibition readily abolished to control micturition. Synonym: bladder reflex, urinary reflex, vesical reflex. (05 Mar 2000) |
| bone reflex | A reflex excited by a stimulus applied to a bone. (05 Mar 2000) |
| brachioradial reflex | With the arm supinated to 45 |
| Brain's reflex | Extension of the arm of a hemiplegic patient when turned prone as if on all fours. Synonym: Brain's reflex. (05 Mar 2000) |
| bregmocardiac reflex | In infants, pressure upon the anterior fontanelle causing cardiac slowing. (05 Mar 2000) |
| Brissaud's reflex | Tickling the sole causes a contraction of the tensor fasciae latae muscle, even when there is no responsive movement of the toes. (05 Mar 2000) |
| bulbocavernosus reflex | A sharp contraction of the bulbocavernosus and ischiocavernosus muscles when the glans penis is suddenly compressed or tapped. (05 Mar 2000) |
| bulbomimic reflex | In a case of coma from severe apoplexy, pressure on the eyeballs causes contraction of the facial muscles of expression on the side opposite to the lesion; if coma due to diabetes, uraemia, or other toxic cause the reflex is present on both sides. Synonym: facial reflex, Mondonesi's reflex. (05 Mar 2000) |
| Capps' reflex | An obsolete eponym for vasomotor collapse at the time of crisis in pneumonia. (05 Mar 2000) |
| cardiac depressor reflex | A fall in blood pressure due to peripheral vasodilation and cardiac inhibition by stimulations of terminations of a cardiac depressor nerve in the aortic arch and base of the heart. Synonym: aortic reflex, depressor reflex. (05 Mar 2000) |
| gag reflex | Contact of a foreign body with the mucous membrane of the fauces causes retching or gagging. Synonym: faucial reflex. (05 Mar 2000) |