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Related Concept Videos

Histology of the Uterus01:19

Histology of the Uterus

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The uterine wall consists of three histological layers: the perimetrium, myometrium, and endometrium. The outermost perimetrium is a thin, serous membrane connected with the broad ligament on the sides, which helps anchor the uterus in the pelvic cavity. The thickest layer, myometrium, is mainly made up of smooth muscle tissue bundles. Its contractions are vital in facilitating the expulsion of the uterine lining, fetus, and placenta during menstruation and childbirth.
The endometrium is the...
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Tight Junctions01:29

Tight Junctions

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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another  cell. These cell junctions are classified  into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Related Experiment Video

Updated: Jan 10, 2026

Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
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Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands

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The Relation between the Inner Myometrium and the Junctional Zone.

Marwan Habiba1, Ilary Ruscito2, Paola Bianchi3

  • 1Department of Health Sciences, University of Leicester and University Hospitals of Leicester, Leicester, UK, mah6@leicester.ac.uk.

Gynecologic and Obstetric Investigation
|November 25, 2025
PubMed
Summary
This summary is machine-generated.

The junctional zone (JZ), the innermost myometrium layer, has debated functions and unclear origins. Its imaging appearance is hormonally dependent, but clinical relevance remains uncertain, necessitating cautious interpretation.

Keywords:
AdenomyosisArchimetraInner myometriumJunctional zone myometriumNeometra

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Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
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Generation of Human Motor Units with Functional Neuromuscular Junctions in Microfluidic Devices

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Last Updated: Jan 10, 2026

Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
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Analysis of Cardiomyocyte Development using Immunofluorescence in Embryonic Mouse Heart
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Area of Science:

  • Reproductive biology
  • Gynecology
  • Medical imaging

Background:

  • The junctional zone (JZ), the myometrium's inner layer, has debated functions and significance beyond adenomyosis diagnosis.
  • Its precise role and characteristics remain poorly understood.

Purpose of the Study:

  • To synthesize current knowledge on the uterine JZ as a distinct anatomical and functional region.
  • To clarify the JZ's role in reproductive physiology.

Main Methods:

  • Comprehensive literature review of PubMed and MEDLINE databases up to April 2025.
  • Focused on the uterine JZ, excluding studies on adenomyosis.

Main Results:

  • JZ imaging characteristics lack clear embryological or functional correlates.
  • Histological differences exist between inner and outer myometrium, but the transition is gradual.
  • JZ appearance on MRI is hormonally dependent and varies with age and menstrual cycle phase.

Conclusions:

  • Considerable uncertainty surrounds the JZ's nature and increased thickness, often misattributed to adenomyosis.
  • No studies directly link JZ features to clinical outcomes, highlighting the need for cautious interpretation.
  • Further research is required to elucidate the JZ's specific functions and clinical relevance.