FactBasedUrology visual education

Medical Illustrations Library

Explore medical illustrations used throughout FactBasedUrology to explain urological anatomy, physiology, symptoms, conditions, tests and treatment concepts. Every illustration links directly to the section where it is explained in context.

Browse urology illustrations

Search by anatomical structure, condition or health topic, use the subject filters, or browse alphabetically. The library updates from FBU’s public educational content.

Showing 146 of 146 contextual medical illustrations.

Medical illustration

Sexual Health

Figure 1: Desire versus erection separation. ED and low libido overlap when the same condition affects both sexual motivation and erection response, but either symptom can also exist alone.

From: Can ED and low libido co-exist in men?

Medical Illustrations Library

Medical Illustrations Library

Browse urology illustrations

Figure 1: Desire versus erection separation. ED and low libido overlap when the same condition affects both sexual motivation and erection response, but either symptom can also exist alone.

Figure 1: Magnesium, SHBG, and free testosterone pathway. Volumetric cellular diagram demonstrating how magnesium status acts as a support factor for testosterone bioavailability, releasing free testosterone (animated).

Figure 1: Neurovascular erection versus central desire. This updated illustration separates brain-driven libido from the penile neurovascular erection system while showing how confidence loss can connect the two.

Figure 1: Thyroid-gonadal axis interaction. Low thyroid can affect libido through energy state, pituitary signaling, prolactin, mood, erections, and testosterone interpretation, not through one simple SHBG claim.

Figure 1: Vitamin D activation pathway. Vitamin D must move through skin/diet input, liver conversion into 25(OH)D, and kidney activation before receptor-mediated effects can support endocrine and vascular biology.

Figure 1: Zinc status and testosterone physiology. Zinc adequacy supports reproductive physiology when deficiency is present; the diagram avoids portraying zinc as a direct sexual stimulant.

Figure 2: Deficiency response versus zinc sufficiency. Zinc repletion may restore deficient physiology, but zinc sufficiency creates a ceiling effect where extra intake is unlikely to improve libido.

Figure 2: Endocrine and vascular map. Vitamin D may support testosterone biology and endothelial nitric oxide signaling, but the human clinical effect depends on baseline deficiency, broader health, and competing libido causes.

Figure 2: Psychophysiology loop. This updated animation shows the clinical pathway from erection monitoring to threat response, sympathetic arousal, pelvic vascular interference, avoidance, and lower desire.

Figure 2: Shared pathway map. Hormonal, vascular, metabolic, neurologic, medication-related, and psychological drivers can converge on both libido and erection response.

Figure 2: Sleep apnea can lower libido through several connected pathways. The testosterone pathway is possible, but it should be evaluated directly rather than assumed from sleep apnea alone.

Figure 2: Symptom-pattern differentiation. Systemic symptoms support thyroid testing, while localized erection symptoms support ED evaluation; mixed causes remain possible.

Figure 2: Testosterone transport fractions in blood. A volumetric cross-section of a blood vessel showing that most circulating testosterone is bound to proteins (SHBG and Albumin), leaving only a small fraction free.

Figure 3: Animated testing and safety pathway. The animation shows why the best practical approach is not blind supplementation but test-guided correction, retesting, and toxicity prevention.

Figure 3: Animated zinc safety gauge. Adult men need about 11 mg/day, while adults should avoid exceeding 40 mg/day unless a clinician has a specific reason and monitoring plan.

Figure 3: Diagnostic decision pathway. Mixed ED-low libido should be approached as a structured differential diagnosis rather than a single-condition label.

Figure 3: Magnesium deficiency risk map. Men with low intake, gastrointestinal loss, medication-related losses, or broader metabolic strain are more plausible candidates for low magnesium support.

Figure 3: Multi-organ cause map. This updated illustration avoids a generic node chart by showing distinct tissue-level pathways: vascular disease, testosterone signaling, mood threat circuitry, medication effects, metabolic risk, and sleep disruption.

Figure 3: Sleep apnea treatment works first by keeping the airway open and improving sleep quality. If libido, erection quality, or low-testosterone symptoms remain, those problems should be evaluated directly.

Figure 3: Treatment and recovery timeline. Thyroid labs can improve before sexual desire, mood, energy, and erection confidence fully normalize.

Figure 4: Magnesium intake safety gauge. This volumetric dial clearly separates the total male RDA from the adult supplemental upper limit.

Figure 5: Low libido decision pathway. A volumetric clinical decision pathway illustrating magnesium’s appropriate place in the assessment.

Normal distribution curve showing the selected percentile

Omega-3s should be framed as background sexual-health support, not as a direct desire switch.

The blood-flow pathway is clinically relevant, but it should not be overstated as direct libido evidence.

What Is the Origin and Primary Function of the Nerves Controlling the Base Muscles? — medical illustration

The “Supra-Systolic Pressure” Mechanism — medical illustration

Secondary Role in Detumescence — medical illustration

Key Neurological Differences — medical illustration

Sympathetic Role (The Detumescence Inducer) — medical illustration

Pharmacological Targets — medical illustration

What Is the Origin of the Dorsal Nerve Pathway? — medical illustration

The Transit Through Alcock’s Canal — medical illustration

Penetrating the Perineal Membrane — medical illustration

Terminal Distribution in the Glans — medical illustration

The “Brake and Gas” Analogy — medical illustration

The “Pro-Erectile” Cascade — medical illustration

The Pelvic Plexus (The Mixing Pot) — medical illustration

The Somatic-Autonomic Bridge — medical illustration

The “Expulsion Phase” Controller — medical illustration

Cyclist’s Syndrome (Alcock’s Canal Entrapment) — medical illustration

The Pudendal Source (S2-S4) — medical illustration

Glans Sensitivity (The Receptor Density) — medical illustration

The Neurovascular Bundle (NVB) Alignment — medical illustration

The Dorsal Penile Nerve Block (DPNB) — medical illustration

How Does Blood Flow Differ Between the Flaccid and Erect States? — medical illustration

The Resistance Inversion (The Core Mechanism) — medical illustration

The Shear Stress Mechanism — medical illustration

The “Inflow-Outflow Equilibrium” — medical illustration

From Aorta to Pelvis (The Macro-Pathway) — medical illustration

The “Common Penile Artery” Junction — medical illustration

The Helicine Artery Branching — medical illustration

What Are the Primary Veins of the Penis? — medical illustration

How Are the Primary Veins of the Penis Classified Anatomically? — medical illustration

What Are the Anatomical Destinations of the Primary Veins of the Penis? — medical illustration

How Do Valves Function Within the Primary Veins of the Penis? — medical illustration

What Are the Major Pathways for Venous Drainage from the Penis? — medical illustration

The Passive Compression Mechanism — medical illustration

What Is the Structural Definition of the Helicine Arteries? — medical illustration

What Is the Role of “Intimal Cushions”? — medical illustration

What Are the Main Arteries That Supply Blood to the Penis? — medical illustration

The “Internal Pudendal” Pipeline — medical illustration

The “Valve” Mechanism — medical illustration

The “Valve” Mechanism — medical illustration

The “Internal Skeleton” Architecture — medical illustration

The “Air Mattress” Analogy (Geometric Control) — medical illustration

The “Sling” Architecture — medical illustration

How Does the Fundiform Ligament Mechanically Support the Penis? — medical illustration

How Does the Fundiform Ligament Differ from the Suspensory Ligament? — medical illustration

How Is the Fundiform Ligament Modified in Surgical Procedures? — medical illustration

Penile Lengthening Surgery (Ligamentolysis) — medical illustration

The “Shared Wall” Architecture — medical illustration

The Pectiniform (Comb-Like) Structure — medical illustration

The “Pressure Equalizer” Mechanism — medical illustration

How Does the Penile Septum Impact Surgical Procedures? — medical illustration

The Layered “Sleeve” Architecture — medical illustration

3D Scientific Visualization: The Telescopic Model — medical illustration