- anal c. SYN: intergluteal c..
- branchial clefts a bilateral series of slitlike openings into the pharynx through which water is drawn by aquatic animals; in the walls of the clefts are the vascular gill filaments that take up oxygen from the water passing through the clefts; sometimes loosely applied to the branchial ectodermal grooves of mammalian embryos, which are imperforate, rudimentary homologues of complete gill clefts. SYN: gill clefts.
- cholesterol c. a space caused by the dissolving out of cholesterol crystals in sections of tissue embedded in paraffin.
- complete posterior laryngeal c. See laryngotracheoesophageal c..
- facial c. a c. resulting from incomplete merging or fusion of embryonic processes normally uniting in the formation of the face, e.g., c. lip or c. palate. SYN: prosopoanoschisis.
- first visceral c. SYN: hyomandibular c..
- gill clefts SYN: branchial clefts.
- gingival c. a fissure associated with pocket formation and lined by mixed gingival and pocket epithelium.
- gluteal c. SYN: intergluteal c..
- hyobranchial c. the c. caudal to the hyoid arch of the embryo.
- hyomandibular c. the c. between the hyoid and mandibular arches of the embryo; the external auditory meatus is developed from its dorsal portion. SYN: first visceral c..
- intergluteal c. [TA] the sulcus between the buttocks (nates). SYN: crena analis [TA], crena ani, crena interglutealis, natal c., anal c., crena clunium, gluteal c..
- interneuromeric clefts clefts between the neuromeric or segmental elevations in the primitive rhombencephalon.
- Larrey c. SYN: trigonum sternocostale.
- laryngotracheoesophageal c. absence of fusion of the musculature or cricoid cartilaginous laminae of varying severity: type 1, submucous c. of the interarytenoid muscles (known also as occult posterior laryngeal c. or submucous laryngeal c.); type 2, partial cricoid c. (known also as partial posterior laryngeal c.); type 3, total cricoid c. (known also as laryngotracheoesophageal c. or total cricoid c.); and type 4, extension of the c. into the esophagus.
- Maurer clefts SYN: Maurer dots, under dot.
- median maxillary anterior alveolar c. an asymptomatic midline defect of the maxillary anterior ridge; the result of a failure of fusion or development of the lateral halves of the palate.
- occult posterior laryngeal c. See laryngotracheoesophageal c..
- partial cricoid c. See laryngotracheoesophageal c..
- partial posterior laryngeal c. See laryngotracheoesophageal c..
- posterior laryngeal c. laryngotracheoesophageal c. (type 2 or 3).
- pudendal c. [TA] the c. between the labia majora. SYN: rima pudendi [TA], fissura pudendi, pudendal cleavage, pudendal slit, rima vulvae, urogenital c., vulvar slit.
- residual c. the remnants of the pituitary diverticulum that occur between the pars distalis and pars intermedia; a distinct lumen is present in some animals, but, in humans, is present only during prenatal development and sometimes in young children. SYN: residual lumen.
- Schmidt-Lanterman clefts SYN: Schmidt-Lanterman incisures, under incisure.
- subdural c. SYN: subdural space.
- submucous laryngeal c. See laryngotracheoesophageal c..
- synaptic c. the space about 20 nm wide between the axolemma and the postsynaptic surface. SEE ALSO: synapse.
- total cricoid c. See laryngotracheoesophageal c..
- urogenital c. SYN: pudendal c..
- visceral c. any c. between two branchial (visceral) arches in the embryo.

* * *

cleft 'kleft n
1) a usu. abnormal fissure or opening esp. when resulting from failure of parts to fuse during embryonic development
2) a usu. V-shaped indented formation: a hollow between ridges or protuberances <the anal \cleft of the human body>
3) the hollow space between the two branches of the frog or the frog and bars or between the bulbs of the heel of a horse's hoof
4) a crack on the bend of the pastern of a horse
5) a division of the cleft foot of an animal

* * *

(kleft) 1. a fissure or elongated opening, especially one occurring in the embryo. 2. a pathologic fissure derived from a failure of parts to fuse during embryonic development.

Medical dictionary. 2011.


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