Exercise 22: Human Reflex Physiology

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DEFINE REFLEX
REFLEXES ARE RAPID, PREDICTABLE, INVOLUNTARY MOTOR RESPONSES TO STIMULI; THEY ARE MEDIATED OVER NEURAL PATHWAYS CALLED REFLEX ARCS. NAME FIVE ESSENTIAL COMPONENTS OF A REFLEX
RECEPTOR, SENSORY NEURON, INTERGRATION CENTER, MOTOR NEURON, AND EFFECTOR IN GENERAL, WHAT IS THE IMPORTANCE OF REFLEX TESTING IN A ROUTINE PHYSICAL EXAMINATION? IT IS AN IMPORTANT DIAGNOSTIC TOOK FOR ASSESSING THE CONDITION OF THE NERVOUS SYSTEM. IT HELPS TO INDICATE DEGENERATION OR PATHOLOGY OF PORTIONS OF THE NERVES, OR CAN HELP PIN POINT AN AREA OF A SPINAL CORD INJURY. REFLEXES CLASSIFIED AS SOMATIC REFLEXES INCLUDE A __1__, __2__, __3__, __4__, __5__, __6__, AND __7__. 1. CROSS-EXTENSOR REFLEX

2. CORNEAL REFLEX
3. GAG REFLEX
4. PLANTAR REFLEX
5. ABDOMINAL REFLEX
6. ACHILLES REFLEX
7. PATELLAR REFLEX
THE SIMPLE STRETCH REFLEXES ARE __1__ AND __2__
1. PATELLAR REFLEX
2. ACHILLES REFLEX
THE SUPERFICIAL CORD REFLEXES ARE __1__ AND __2__
1. ABDOMINAL REFLEX
2. PLANTAR REFLEX
REFLEXES CLASSIFIED AS AUTONOMIC REFLEXES INCLUDE __1__ AND __2__. 1. PUPILLARY LIGHT REFLEX
2. CILIOSPINAL REFLEX
NAME TWO CORD-MEDIATED REFLEXES
PATELLAR REFLEX AND CROSS-EXTENSOR REFLEX
NAME TWO SOMATIC REFLEXES IN WHICH THE HIGHER BRAIN CENTERS PARTICIPATE PUPILLARY LIGHT REFLEXES AND SUPERFICIAL CORD REFLEXES
CAN THE STRETCH REFLEX BE ELICITED IN A PITHED ANIMAL (THAT IS, AN ANIMAL IN WHICH THE BRAIN HAS BEEN DESTROYED)? YES, EVEN WITHOUT THE BRAIN A STRETCH REFLEX ONLY NEEDS A AFFERENT, CONTROL CENTER, AND MOTOR FIBERS TO BE ELICITED. THESE COMPONENTS STILL STAY INTACT IF THE BRAIN HAS BEEN DESTROYED. TRACE THE REFLEX ARC, NAMING EFFERENT AND AFFERENT NERVES, RECEPTORS, EFFECTORS, AND INTEGRATION CENTERS.

PATELLAR REFLEX
HIT PATELLAR TENDON TO EXCITE MUSCLE SPINDLES OF QUADRICEPS. (AFFERENT NERVE) FEMORAL NERVE TO (INTEGRATION CENTERS) L2 - L4 FROM THERE IT GOES TO (EFFERENT NERVE) FEMORAL BACK TO QUADRICEPS (EFFECTOR) TO MAKE CONTRACTION. ALSO SENDS TO HAMSTING...
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