Finding:

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   Onuf's nucleus

   Onuf’s nucleus is a distinct group of neurons located in the ventral part (laminae IX) of the anterior horn of the sacral region of the human spinal cord involved in the maintenance of micturition and defecatory continence, as well as muscular contraction during orgasm.
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   Bronislaw Onuf-Onufrowicz

   Bronislaw Onuf-Onufrowicz (1863 in Yeniseysk - December 29, 1928 in Rutherford, New Jersey) was a Russian-born American neurologist of Polish descent. ... He is best known for his discovery of group of neurons in spinal cord, Onuf's nucleus.
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   Rexed laminae

   The Rexed laminae comprise a system of ten layers of grey matter (I-X), identified in the early 1950s by Bror Rexed to label portions of the spinal cord. ... Lamina IX: lateral (in limb regions) and medial motor neurons, also phrenic and spinal accessory nuclei at cervical levels, and Onuf's nucleus in the sacral region
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   Pudendal nerve

   The pudendal nerve is a mixed somatic and autonomic nerve in the pelvic region which is a large branch of the sacral plexus (L4-5, S1-4) that innervates the external genitalia of both sexes, as well as sphincters for the bladder and the rectum. It originates in Onuf's nucleus in the sacral region of the spinal cord.
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   Urination

   Urination, also known as micturition, voiding, peeing, and more rarely, emiction, is the process of disposing of urine from the urinary bladder through the urethra to the outside of the body. ... The pontine micturition center also causes inhibition of Onuf's nucleus, resulting in relaxation of the external urinary sphincter.
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   Posteromarginal nucleus

   The posteromarginal nucleus, or Substantia Marginalis, Rexed lamina I, is located at the most dorsal aspect of the dorsal horn of the spinal cord. ... | VIII-IX: Anterior horn | Interneuron · Alpha motor neuron (Onuf's nucleus) |
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   Lateral raphespinal tract

   The lateral raphespinal tract is a tract in the spinal cord. ... | VIII-IX: Anterior horn | Interneuron · Alpha motor neuron (Onuf's nucleus) |
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   Anterior raphespinal tract

   The anterior raphespinal tract is a tract in the spinal cord. ... | VIII-IX: Anterior horn | Interneuron · Alpha motor neuron (Onuf's nucleus) |
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   Spino-olivary tract

   This tract carries proprioception information from muscles and tendons as well as cutaneous impulses to the olivary nucleus. ... | VIII-IX: Anterior horn | Interneuron · Alpha motor neuron (Onuf's nucleus) |
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    Ventral root

    In anatomy and neurology, the ventral root (or anterior root) is the efferent motor root of a spinal nerve. ... | VIII-IX: Anterior horn | Interneuron · Alpha motor neuron (Onuf's nucleus) |

Explore the following pages on Powerset:

• Onuf's nucleus,
• Bronislaw Onuf-Onufrowicz,
• Rexed laminae,
• Pudendal nerve,
• Urination,
• Posteromarginal nucleus,
• Lateral raphespinal tract,
• Anterior raphespinal tract,
• Spino-olivary tract,
• Ventral root

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