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Ch. 15 The Urinary System
Marieb - Essentials of Human Anatomy & Physiology 13th Edition
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb 13th EditionCh. 15 The Urinary SystemProblema 22
Capitolo 15, Problema 22

Define micturition, and describe the micturition reflex.

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Micturition is the process of expelling urine from the urinary bladder through the urethra to the outside of the body. It is commonly referred to as urination.
The micturition reflex is a complex neural mechanism that controls the process of urination. It involves both voluntary and involuntary components regulated by the central and peripheral nervous systems.
The reflex begins when stretch receptors in the bladder wall are activated as the bladder fills with urine. These receptors send signals to the spinal cord via afferent sensory neurons.
In response, parasympathetic motor neurons are activated, causing the detrusor muscle of the bladder to contract and the internal urethral sphincter to relax. This prepares the bladder for emptying.
Voluntary control is exerted by the external urethral sphincter, which is controlled by somatic motor neurons. When a person decides to urinate, the external sphincter relaxes, allowing urine to flow out of the bladder through the urethra.

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Micturition

Micturition, commonly known as urination, is the physiological process of discharging urine from the urinary bladder through the urethra. This process is controlled by both voluntary and involuntary mechanisms, involving the coordination of the bladder muscles and the nervous system. Understanding micturition is essential for recognizing how the body regulates fluid balance and waste elimination.

Micturition Reflex

The micturition reflex is a neural reflex that facilitates the process of urination. It is initiated when the bladder fills with urine, activating stretch receptors in the bladder wall. This triggers signals to the spinal cord and brain, leading to the contraction of the detrusor muscle and relaxation of the external urethral sphincter, allowing urine to flow out of the bladder.
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Stretch Reflex

Neural Control of Micturition

The neural control of micturition involves complex interactions between the central and peripheral nervous systems. The pontine micturition center in the brainstem plays a crucial role in coordinating the micturition reflex, while the autonomic nervous system regulates involuntary bladder contractions. Understanding this control is vital for addressing disorders related to urination, such as incontinence or urinary retention.
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Levels of Control in the ANS
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