INNERVATION & NEUROPHYSIOLOGY Cerebral (Suprapontine) Control Although micturition and urine storage are primarily functions of the autonomic nervous system, these are under voluntary control from suprapontine cerebral centers, so that other groups of muscles (arm, leg, hand, bulbocaver-nosus) can be integrated to assist in urination at the appropriate time and place. Cerebral lesions (eg, from tumor, Parkinson's disease, vascular … [Read more...]
Cerebral (Suprapontine) Control & Neurotransmitters & Receptors
February 15, 2012 by Leave a Comment
INNERVATION & NEUROPHYSIOLOGY The Storage Function
February 14, 2012 by Leave a Comment
INNERVATION & NEUROPHYSIOLOGY The Storage Function The external sphincter plays an important role in urine storage. The afferents from pelvic and pudendal nerves activate both the sacral and lateral pontine center; this enhances sphincteric contraction while suppressing the parasympathetic impulse to the detrusor. Voluntary tightening of the sphincter can also inhibit the urge to urinate. In addition, activation of sympathetic … [Read more...]
INNERVATION & NEUROPHYSIOLOGY The Micturition Reflex
February 14, 2012 by Leave a Comment
INNERVATION & NEUROPHYSIOLOGY The Micturition Reflex Intact reflex pathways via the spinal cord and the pons are required for normal micturition. Afferents from the bladder are essential for the activation of the sacral center, which then causes detrusor contraction, bladder neck opening, and sphincteric relaxation. The pontine center, through its connection with the sacral center, may send either excitatory or inhibitory impulses to … [Read more...]
