The subclavian vein continues upper-limb venous return across the thoracic inlet and joins the internal jugular vein to form a brachiocephalic vein. Its relation to the clavicle and nearby vessels is important for regional anatomy.

The deep dorsal vein of the penis drains erectile and adjacent structures along a deep dorsal route. Its connections include pelvic venous pathways. It is distinct from superficial veins draining skin and superficial tissues.

A dural venous sinus is a venous channel associated with layers of cranial dura. It receives intracranial drainage and connects toward the internal jugular route. Its wall and location differ from an ordinary freely mobile vein in soft tissue.

A vena cava is a major systemic venous channel returning blood to the right atrium. The superior and inferior venae cavae drain different body regions. Their return reflects upstream volume and pressure relationships rather than active pumping by the vein itself.

A lumped venous reservoir stores blood at a pressure determined by its volume and vascular compliance. If its inflow and outflow are $Q_{\mathrm{in}}$, $Q_{\mathrm{out}}$, the constant-compliance approximation gives $C_v{\dot{p}}_v=Q_{\mathrm{in}}-Q_{\mathrm{out}}$. It forms the filling side of a three-compartment ventricular circulation model.

Let $K$ be a convex set in a real Banach space, and let $A:K\to X^{\ast }$ be a strongly monotone operator. If $u,w\in K$ both satisfy the displayed variational inequality, testing with $v=w$ and $v=u$ respectively and adding yields $⟨Au-Aw,u-w⟩\le 0$. Strong monotonicity gives $m\Vert u-w{\Vert }^2\le 0$, hence $u=w$. This proves uniqueness whenever a solution exists.

The hymen is a variable fold or rim of tissue near the vaginal opening. Its shape and elasticity vary naturally, and it need not seal the opening. Appearance of the hymen cannot reliably establish a person's sexual history; it is an anatomical structure rather than a biological record of one event.^[ref]

The tonoplast is the cell membrane surrounding a plant vacuole. Its transport systems maintain differences in ion composition, pH and stored substances between the vacuolar interior and the cytoplasm. Proton pumping supplies an electrochemical gradient that can drive coupled transport. This makes the tonoplast central to cellular storage and osmosis, while distinguishing it from the outer plasma membrane surrounding the whole plant cell. ^[ref]

A uterine fibroid situated within the muscular wall of the uterus. The term locates the lesion anatomically; it does not alone specify symptoms or biological behavior.^[ref]

A uterine fibroid contacting or projecting into the uterine cavity beneath the endometrial surface. Cavity distortion distinguishes this location from a purely outward-growing lesion.^[ref]

A uterine fibroid growing toward or beyond the outer surface of the uterus. Its location makes pressure on surrounding structures more relevant than direct distortion of the uterine cavity.^[ref]

A uterine fibroid attached by a stalk. The term describes its attachment, while submucosal or subserosal describes its relation to uterine layers; these descriptors can therefore apply to the same lesion.^[ref]

The dense fibrous membrane separating superficial and deeper perineal structures; corresponds to the inferior layer of older triangular-ligament descriptions.

Historical anatomical model of perineal muscle and fascia; it should not be read as a universally uniform muscular sheet between two identical fascial layers.

Excess leukocytes in urine; this finding does not by itself prove bacterial infection or localise all lesions.

A salt of calcium and oxalate that can form crystals in urine and contribute to urinary stones. Crystal formation depends on solution conditions, so detecting crystals does not alone establish an obstructing stone.

A urinary cast containing red blood cells. Its tubular formation supports a renal origin of bleeding and is particularly associated with glomerular inflammation rather than bleeding confined to the lower urinary tract.^[ref]

A renal tubular cast containing white blood cells; a sign of intrarenal inflammation, not a diagnosis of one specific cause.

Historical description of transient functional obstruction attributed to muscular spasm. It must be distinguished from a fixed fibrotic urethral stricture and from other causes of urinary retention.

The median umbilical ligament is the fibrous remnant of the urachus running from the bladder apex toward the umbilicus. It is distinct from the paired medial umbilical ligaments associated with obliterated umbilical arteries. The similar names refer to different developmental remnants.