Branchial clefts

Also found in: Medical, Encyclopedia.
the openings between the branchial arches through which water passes.
See under Branchial.

See also: Branchial, Cleft

References in periodicals archive ?
Branchial cleft anomalies occur as a result of incomplete obliteration of the branchial clefts during embryogenesis.
4) During embryonic development, the second arch grows caudally and it covers the second, third, and fourth branchial clefts.
The fetal branchial apparatus develops in the 2nd gestational week and consists of 6 pairs of mesodermal arches separated by 5 ectoderm-lined branchial clefts externally and 5 endoderm-lined pharyngeal pouches internally.
As development progresses, the second branchial arch proliferates caudally and encloses the second, third, and fourth branchial clefts creating an ectodermally lined cavity, the cervical sinus.
Fusion with the epicardial ridge results in an ectoderm-lined cavity, the cervical sinus of His, which encloses the second, third, and fourth branchial clefts.
They arise as a result of an abnormal development of the branchial arches and their corresponding ectoderm-lined branchial clefts.
He suggested that these cysts were results of impaired obliteration of branchial clefts (8).
18) The cysts arise from the third and fourth branchial clefts, and, therefore, thymic cysts may have a similar appearance to third and fourth branchial cleft cysts, being differentiated only by the presence of thymic tissue within thymic cysts.
The second, third, and fourth branchial clefts merge to form the sinus of His, which will normally become involuted.
As normal development proceeds, the branchial clefts and pouches are obliterated, except for the unique first cleft.
However, in general, the branchial apparatus structures develop between the 4th and 6th week of gestation and consist of 6 pairs of mesodermal branchial arches separated by 5 paired endodermal pharyngeal pouches internally and 5 paired ectodermal branchial clefts externally.
FIRST BRANCHIAL ANOMALY: First branchial clefts comprise 5-25% of all branchial anomalies (3, 4).