Salpinx in anatomy

Salpinx is a Greek word meaning trumpet or tube, and in anatomy it survives as a name for two tubular structures, the uterine tube and the auditory tube.

Terminologia Anatomica prefers the Latin tuba for most tubes, but the salpinx stem remains in derivatives such as mesosalpinx, salpingitis and salpingopharyngeus.

The persistence of two competing roots is a useful reminder that anatomical nomenclature is historical rather than purely logical.

Terminology

• Salpinx entered Greek anatomy as the name of a trumpet, and the shape of a flared tube made the metaphor natural for the uterine and auditory tubes.
• Terminologia Anatomica uses tuba uterina and tuba auditiva as preferred terms, and it lists salpinx only in derived forms.
• The adjective salpingeal refers to the uterine tube, while salpingopharyngeal refers to the auditory tube and pharynx.
• Because the same root serves two different tubes, clinical words must be read in context, as salpingitis usually means tubal infection rather than auditory tube infection.
• The English word salpinx is rare in modern clinical speech, but it remains common in anatomy and in Greek-derived terminology.

Uterine tube

• The uterine tube extends from the uterine horn to the ovary and is divided into intramural, isthmic, ampullary and infundibular parts.
• The infundibulum ends in fimbriae that sweep over the ovary and help capture the ovulated oocyte.
• The ampulla is the usual site of fertilisation, and it is also the commonest site of ectopic pregnancy.
• The isthmus has a thick muscular wall and acts as a sphincter before the tube enters the uterus.
• The tube is lined by ciliated and secretory cells whose activity changes with the menstrual cycle and with oestrogen and progesterone.
• Mesosalpinx is the part of the broad ligament that suspends the tube, and it carries the tubal branches of the uterine and ovarian arteries.
• Salpingitis is inflammation of the tube, and it can lead to hydrosalpinx, pyosalpinx and tubal factor infertility.
• Salpingectomy is removal of the tube, and salpingostomy opens it to restore patency in selected cases.
• Hydrosalpinx describes a distended, fluid-filled tube with a closed fimbrial end, and it reduces implantation rates in assisted reproduction.

Auditory tube

• The auditory tube connects the nasopharynx to the middle ear and is divided into a bony third and a cartilaginous two-thirds.
• The pharyngeal opening lies on the lateral wall of the nasopharynx, and the tympanic opening opens into the anterior wall of the middle ear.
• The tube is normally closed and opens during swallowing, yawning and chewing through the action of the tensor veli palatini and salpingopharyngeus.
• Its main functions are equalising middle-ear pressure with atmospheric pressure and draining secretions from the middle ear.
• Salpingopharyngeus arises from the cartilaginous part of the tube and blends into the pharyngeal constrictors.
• The salpingopalatine fold and salpingopharyngeal fold are mucosal folds that run from the tube into the palate and pharynx.
• Eustachian tube dysfunction causes negative middle-ear pressure, otitis media with effusion and barotrauma during flight or diving.
• In children the tube is shorter, more horizontal and more compliant, which contributes to the high incidence of middle-ear infection.

Development

• The uterine tube develops from the paramesonephric duct, whose cranial end remains open to the coelom and forms the infundibulum and fimbriae.
• The caudal part of the paramesonephric duct fuses with its partner to form the uterus and cervix, while the unfused cranial part becomes the tube.
• The auditory tube develops from the first pharyngeal pouch, and its endoderm gives rise to the lining of the middle ear and mastoid air cells.
• Failure of the first pouch to elongate normally can produce a short or abnormally patent auditory tube.
• Abnormal fusion of the paramesonephric ducts can produce a unicornuate uterus with a rudimentary tube or other müllerian anomalies.

Clinical significance

• Ectopic pregnancy most often implants in the ampulla, and tubal rupture is a surgical emergency.
• Pelvic inflammatory disease damages the tubal mucosa and cilia, which increases the risk of infertility and recurrent ectopic pregnancy.
• Tubal ligation is a contraceptive procedure that interrupts the tube, usually at the isthmus.
• Hysterosalpingography and saline infusion sonography are used to assess tubal patency in infertility.
• Chronic auditory tube dysfunction is a common cause of persistent middle-ear effusion in adults and children.
• Barotrauma from flying or diving can rupture the tympanic membrane if the tube fails to open.
• Salpingopharyngeus contraction helps open the tube, and its weakness may contribute to swallowing-related ear symptoms.

Comparative anatomy

• The uterine tube is a mammalian structure, and its length and fimbrial development vary with the type of ovary and the site of fertilisation.
• Birds and reptiles have a single oviduct that performs the functions of the mammalian tube, uterus and vagina, and it is not divided in the same way.
• The auditory tube is present in all tetrapods, and its length and angle differ between species according to skull shape and posture.
• Fish lack a tympanic middle ear and therefore lack a true auditory tube, although they have pharyngeal pouches with comparable developmental origins.

History

• The uterine tube is often called the Fallopian tube after Gabriele Falloppio, who described it in the sixteenth century.
• The auditory tube is named after Bartolomeo Eustachi, who described it in the same period, and it is also called the Eustachian tube.
• The Greek salpinx remained in use because both tubes were seen as trumpet-shaped, and the metaphor survived the shift to Latin tuba.
• Terminologia Anatomica now lists tuba uterina and tuba auditiva as preferred terms while retaining salpinx in derived names.

Research and controversies

• The optimal management of hydrosalpinx before IVF, whether salpingectomy or proximal occlusion, is still debated.
• Whether the tube contributes to oocyte maturation or only transports it is an active question in reproductive biology.
• Balloon dilatation of the auditory tube is used for chronic dysfunction, but evidence for long-term benefit remains limited.
• Anatomical variation in tubal length and fimbrial shape affects the success of tubal surgery, yet normative data are sparse.
• The uterine tube transports the oocyte by ciliary beating and by peristaltic contractions of its smooth muscle, and both mechanisms are affected by inflammation.
• The auditory tube opens briefly because surface tension keeps its walls apposed, and surfactant-like substances lower the opening pressure.