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Orchitis is inflammation of the testis. Causes can differ, and associated epididymal inflammation is termed epididymitis. Distinguishing the affected anatomical compartments is important because a painful scrotum can involve structures other than the testicular tissue itself.

The epididymis is a highly coiled duct adjacent to the testis through which sperm pass after leaving the testicular ducts. It supports maturation, transport and storage. Its position outside the main testicular tissue explains why a localized epididymal swelling need not arise within the testis.

A condition-dependent carbon dioxide fraction at which a specified candle flame is extinguished in a specified protocol. Distinguish a demonstrated sufficient fraction from the least sufficient fraction.

Infection acquired before birth; an infant may initially lack visible signs. Historical “hereditary” terminology does not imply Mendelian inheritance.

Primary lesion classically associated with acquired syphilis; appearance alone does not establish the diagnosis.

A late form of syphilis with destructive granulomatous lesions called gummas. Their tissue effects differ from the primary chancre, illustrating how one infection can produce distinct pathological stages.^[ref]

Involvement of the nervous system by syphilis; it is not confined to a single chronological stage.

The unique readability theorem asserts uniqueness of the outer formation rule and its immediate components in a logical formula. For the fully parenthesized language with negation and implication, every formula is uniquely a variable, a negation of one formula, or an implication between an ordered pair of formulas. It gives a well-defined syntax tree and licenses recursive definitions and structural induction on formulas.

The synovial joint between the head of the humerus and the glenoid cavity of the scapula.

A joint capsule surrounds a synovial joint, with a fibrous outer layer and an internal synovial membrane at appropriate surfaces. It encloses the joint cavity while allowing movement. Regional thickening and attachments constrain motion differently in different directions.

The glenoid labrum is a rim of fibrocartilaginous tissue around the glenoid cavity. It deepens the socket and contributes attachment and stability at the glenohumeral joint. Stability also depends on the capsule and muscles, so the labrum is one component of a coupled system.

Synovium denotes the synovial membrane and its associated tissue. It forms an active interface between the joint cavity and the vascular supporting tissue. The term therefore refers to tissue, whereas synovial fluid refers to the material in the cavity.

Synovial fluid is the specialized fluid within a synovial joint. It supports lubrication and exchange with the avascular articular cartilage. Its volume, composition and mechanical behavior are distinct properties, so a change in one need not identify the cause of every joint symptom.

The synovial membrane lines the internal non-cartilaginous surfaces of a synovial joint capsule. It contributes to production and regulation of synovial fluid. It does not simply extend as the same lining over the load-bearing articular cartilage.

A bursa is a fluid-containing sac positioned where tissues move against one another, such as a tendon crossing bone. Its sliding surfaces reduce friction. A bursa can lie near a synovial joint without necessarily communicating with the joint cavity.

The superior cervical ganglion is an upper sympathetic ganglion supplying postganglionic pathways toward head and neck structures. Its outputs include routes affecting ocular and vascular functions. Ganglion location and the eventual target location need not be adjacent.

Exchange two equally long disjoint segments of an array, preserving the order within each segment. Applying one swap at each corresponding offset exchanges length-$n$ blocks in $n$ swaps and constant auxiliary storage. Disjointness ensures that an earlier swap does not overwrite an original value needed by a later pair.

A curved free interface of a liquid near a solid wall. Its shape reflects surface tension, contact angle and hydrostatic pressure.

An amino sulfonic acid contains both an amino group and a sulfonic acid group. Taurine is a simple example, with the groups separated by a two-carbon chain.

An amino sulfonic acid can carry a protonated amino group and a deprotonated sulfonate group simultaneously. This zwitterion structure illustrates why net electrical neutrality does not imply the absence of charged sites.

A sulfuric-acid monoester involved in a traditional account of producing diethyl ether from ethanol.