| residual cleft | 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. Synonym: residual lumen. (05 Mar 2000) |
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| cholesterol cleft | A space caused by the dissolving out of cholesterol crystals in sections of tissue embedded in paraffin. (05 Mar 2000) |
| cleft | A fissure. (05 Mar 2000) |
| cleft hand | A congenital deformity in which the division between the fingers, especially between the third and fourth, extends into the metacarpal region. See: lobster-claw deformity. Synonym: main fourchee, split hand. (05 Mar 2000) |
| cleft lip | <embryology, paediatrics> A genetic disorder that results in the failure of fusion in the upper lip. Also seen commonly in association with cleft palate. (13 Nov 1997) |
| cleft palate | <embryology, paediatrics> A congenital fissure in the roof of the mouth forming a communication between the nasal passages and the oral cavity. (13 Nov 1997) |
| cleft spine | See: spina bifida. (05 Mar 2000) |
| cleft tongue | A structural defect of the tongue in which the extremity is divided longitudinally for a greater or lesser distance. See: diglossia. Synonym: cleft tongue. (05 Mar 2000) |
| cleft uvula | The uvula, the little V-shaped fleshy mass hanging from the back of the soft palate, is cleft. Cleft uvula is a common minor anomaly occurring in about 1% of whites and 10% of Native Americans. Persons with a cleft uvula should not have their adenoids removed because, without the adenoids, they cannot achieve proper closure between the soft palate and pharynx while speaking and develop hypernasal speech. Also called bifid uvula. (12 Dec 1998) |
| pudendal cleft | The cleft between the labia majora. Synonym: rima pudendi, fissura pudendi, pudendal cleavage, pudendal slit, rima vulvae, urogenital cleft, vulvar slit. (05 Mar 2000) |
| hyobranchial cleft | The cleft caudal to the hyoid arch of the embryo. (05 Mar 2000) |
| hyomandibular cleft | <anatomy> The cleft between the hyoid and mandibular arches of the embryo; the external auditory meatus is developed from its dorsal portion. Synonym: first visceral cleft. (05 Mar 2000) |
| natal cleft | The sulcus between the buttocks (nates). Synonym: crena ani, anal cleft, crena clunium, gluteal cleft. (05 Mar 2000) |
| subdural cleft | Originally thought to be a narrow fluid-filled interval between the dural and arachnoid; now known to be an artificial space created by the separation of the arachnoid from the dura as the result of trauma or some ongoing pathologic process; in the healthy state, the arachnoid is attached to the dura and a naturally occurring subdural space is not present. Synonym: spatium subdurale, cavum subdurale, subdural cavity, subdural cleavage, subdural cleft. (05 Mar 2000) |
| synaptic cleft | <physiology> The narrow space between the presynaptic cell and the postsynaptic cell in a chemical synapse, across which the neurotransmitter diffuses. (10 Jan 1998) |