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a cord-like tissue connecting two larger parts of an anatomical structure (同)band
a relatively narrow strip of land (with water on both sides) connecting two larger land areas

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地峡

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/09/05 10:19:39」(JST)

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The uterine isthmus is the inferior-posterior part of uterus, on its cervical end — here the uterine muscle (myometrium) is narrower and thinner. It connects superiorly-anteriorly to the complementary parts of the uterus: the body and the fundus.^[1]

The uterine isthmus can become more compressibile in pregnancy, which is a finding known as Hegar's sign.

References

^ N. Jayne Klossner and Nancy T. Hatfield (2006). Introductory Maternity & Pediatric Nursing. Lippincott Williams & Wilkins. p. 56. ISBN 9780781736909.

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English Journal

Neurotrophins and specific receptors in the oviduct tracts of Japanese quail (Coturnix coturnix japonica).

Maruccio L1, Castaldo L2, D'Angelo L2, Gatta C2, Lucini C2, Cotea C3, Solcan C3, Nechita EL3.
Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft.Ann Anat.2016 Sep;207:38-46. doi: 10.1016/j.aanat.2016.04.033. Epub 2016 May 7.
Neurotrophins (NGF, BDNF and NT-3) and their specific receptors (TrkA, TrkB and TrkC) were studied in the oviduct of egg laying quails. Neurotrophins (NTs) are mainly involved in the development and maintenance of neuronal populations in the central and peripheral nervous system, but also in reprodu
PMID 27167968

Bioelectrical activity of porcine oviduct and uterus during spontaneous and induced estrus associated with cyclic hormone changes.

Pawliński B1, Domino M1, Aniołek O1, Ziecik A2, Gajewski Z3.
Theriogenology.Theriogenology.2016 Aug 4. pii: S0093-691X(16)30338-7. doi: 10.1016/j.theriogenology.2016.07.029. [Epub ahead of print]
It is widely accepted that uterine contraction is initiated by spontaneous generation of electrical activity at a cellular level in the form of action potentials. Such action potential events, when they involve many myometrial cells and occur in immediate succession, are described by their amplitude
PMID 27590095

Microfluidic devices for the study of sperm migration.

Suarez SS1, Wu M2.
Molecular human reproduction.Mol Hum Reprod.2016 Jul 6. [Epub ahead of print]
Microfluidics technology offers us an opportunity to model the biophysical and biochemical environments encountered by sperm moving through the female reproductive tract and, at the same time, to study sperm swimming dynamics at a quantitative level. In humans, coitus results in the deposition of sp
PMID 27385726