A multi-panel pathophysiology diagram illustrating the synchronous physiological changes during a standard 28-day human menstrual cycle. The top panel graphs gonadotropin levels, showing a sharp surge in Luteinizing Hormone (LH) and a moderate rise in Follicle-Stimulating Hormone (FSH) at day 14, correlating with the follicular phase, ovulation, and luteal phase stages. The corresponding follicular development shows the maturation of a primary follicle into a Graafian follicle, ovulation, and the formation of the corpus luteum and corpus albicans. The middle panel tracks plasma sex hormone levels, highlighting the mid-cycle peak of Estradiol (E2) and the post-ovulatory rise of Progesterone (P4). The bottom panel depicts endometrial morphology, transitioning from the menstrual phase to the proliferative and secretory phases. A green-shaded layer highlights the glycocalyx development, which thickens and becomes most prominent during the secretory phase under the influence of P4, before thinning during menstruation. The diagram demonstrates the hormonal regulation of the ovary and uterine lining for medical educational purposes.

This composite educational resource compares 2D and 3D transvaginal color Doppler sonography (TV-CDS) for evaluating pelvic vascularity. (a) A cross-sectional anatomical diagram and 2D TV-CDS image highlight the uterine vascular hierarchy during the follicular phase, depicting arcuate, radial, and spiral vessels. (b) A timeline diagram illustrates endometrial vascular changes across the menstrual cycle phases: Menstrual, Proliferative, Secretory, and Ischemic. This is paired with a 2D TV-CDS showing the characteristic increase in spiral vessel density during the luteal phase. (c) The bottom section focuses on the corpus luteum, featuring a diagram of the female reproductive system with a magnified view of ovarian vascularization. Below this, multiplanar 3D TV-CDS images (longitudinal, axial, and coronal planes) and a high-definition 3D reconstruction demonstrate the pathognomonic vascular 'wreath'—a dense circumferential ring of blood vessels surrounding the functioning corpus luteum. This content illustrates key gynecological sonography concepts, including the cyclical nature of endometrial perfusion and the advanced spatial assessment afforded by 3D Doppler imaging for ovarian structures.

Educational medical visualization of resting-state fMRI (rs-fMRI) analysis across three menstrual cycle phases: menses, pre-ovulatory, and luteal. The image is divided into three panels representing different neuroimaging metrics. Panel (a) shows Eigenvector Centrality (EC) with colored regions in the bilateral hippocampus (purple), indicating a significant increase in functional network importance during the luteal phase compared to the pre-ovulatory phase. Panel (b) illustrates the Amplitude of Low-Frequency Fluctuations (ALFF) in the bilateral caudate (blue and light blue), showing significantly higher neural activity during the luteal phase. Panel (c) displays seed-based functional connectivity changes. It highlights increased connectivity between the left putamen and right thalamus (green) during the luteal phase, and dynamic connectivity between the right caudate and right middle frontal gyrus (MFG, dark blue), which peaks during the pre-ovulatory phase. Each panel includes 3D brain renderings, coronal (y-coordinates), and axial (z-coordinates) cross-sections, alongside quantitative line plots with statistical significance markers (*) for longitudinal comparison of cycle-dependent neuroplasticity.

This musculoskeletal diagram illustrates the four kinematic phases of the human sit-to-stand (STS) cycle: Flexion Momentum, Momentum Transfer, Extension, and Stabilization. Each phase is represented by a skeletal model with overlaid muscular activation indicators (red and blue markers) and ground/seat contact spheres. Phase 1 (Flexion Momentum) shows the subject in a seated position with initial trunk flexion. Phase 2 (Momentum Transfer) depicts the lifting of the pelvis from the chair (seat-off), requiring increased hip flexion and ankle dorsiflexion. Phase 3 (Extension) visualizes the upward movement where hip and knee extension occurs, showing significant activation of the quadriceps and gluteal muscle groups. Phase 4 (Stabilization) shows the final erect standing posture with weight-bearing joint alignment and postural stability activation. The diagram further classifies these movements into two different control models: a detailed '4-phases' model (green) and a simplified '2-phases' model (orange), useful for biomechanical analysis and rehabilitation engineering.