Urethra

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4 Terms

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Female urethra epithelial tissue lining

Nonkeratinized stratified squamous epithelium

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Internal urethral spincter

  • Smooth muscle

  • Part of detrusor muscle

  • Involuntary

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External urethral spincter

  • Skeletal muscle

  • Part of urogenital diaphragm muscles

  • Voluntary

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Micturition

  1. Pressure receptors in bladder send signal to spinal cord & brain

  2. When bladder reaches pressure threshold, brain stimulates motor neurons in spinal cord

  3. Autonomic motor impulse send to contract detrusor muscle and to relax internal urethral sphincter

  4. The same impulses also inhibit the somatic motor neurons innervating the external urethral sphincter, causing it to relax