Examination of the motor system

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Presentation transcript:

Examination of the motor system Enas Sabah MSc. Human Physiology

Examination of the motor system: It includes the following: Size, tone and power of the muscles Coordination of movement Gait Reflexes

Reflexes: Reflex is an involuntary response to a stimulus and it is the basic integrated function of the nervous system. Components of a reflex arc include: Receptor. Afferent (sensory) pathway Central integrating part ( Spinal cord, Brain stem, Cerebral cortex and cerebellum) Efferent (motor) pathway Effector organ ( Muscle or gland)

Classification of reflexes: According to whether it is inborn or acquired. According to site of integration ( Spinal cord, Brain stem, Cerebral cortex and cerebellum). According to movement involved (extensor or flexor reflex). According to the number of synapses (monosynaptic or polysynaptic reflex). According to depth (superficial or deep reflex).

Superficial reflexes: mucous membrane (corneal, conjunctival reflex). skin ( abdominal T11,T12, cremasteric L1,2, planter L5,S1).

Deep (tendon) reflexes: Ankle reflex (S1,2) knee reflex (L3,4) Biceps reflex (C5,6) Triceps reflex (C6,7) Supinator (Brachioradialis) reflex (C5,6) Jaw reflex (Trigeminal n.)

Motor neuron lesion There are two types of motor neuron lesion: Upper motor neuron lesion (UMNL) Deep reflexes are exaggerated Superficial reflexes are lost Babniski’s sign become positive (upward planter response) Lower motor neuron lesion (LMNL) Deep and superficial reflexes are lost

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