Anatomic and functional mapping of human uterine innervation

Area of Science:

• Reproductive Biology
• Neuroanatomy
• Pelvic Pain Pathophysiology

Background:

• Pelvic pain conditions, such as endometriosis, are linked to altered uterine innervation.
• Understanding the precise anatomy of uterine nerves is crucial for diagnosing and treating these conditions.

Purpose of the Study:

• To create a comprehensive 3-dimensional (3D) model of human uterine macro- and microinnervation.
• To investigate the distribution and types of nerve fibers within the uterus.

Main Methods:

• Anatomical dissection of 4 human female fetal pelvises.
• Serial sectioning, hematoxylin and eosin staining, and immunostaining for nerve detection.
• 3D reconstruction of aligned tissue slices to visualize innervation patterns.

Main Results:

• A detailed 3D model of uterine innervation was successfully constructed.
• Nerve fibers followed a centripetal path from the serosa to the endometrium, with dense myometrial and sparse endometrial innervation.
• Innervation was richest in the supravaginal cervix and lateral aspects, with four identified nerve types (sympathetic, parasympathetic, sensitive).

Conclusions:

• The 3D model provides a foundational resource for studying uterine innervation in pathological states.
• This anatomical insight may facilitate the development of novel therapeutic strategies for pelvic pain disorders.