| punctum luteum | An oval area of the sensory retina, 3 by 5 mm, temporal to the optic disk corresponding to the posterior pole of the eye; at its centre is the central fovea, which contains only retinal cones. Synonym: area centralis, macula lutea, macular area, punctum luteum, Soemmerring's spot, yellow spot. (05 Mar 2000) |
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| atretic corpus luteum | A retrogressed corpus luteum characterised by increasing cicatrization and shrinkage of the cicatricial core with an amorphous, convoluted, completely hyalinised lutein zone surrounding the central plug of scar tissue. Synonym: albicans, atretic corpus luteum, corpus candicans. Corpora allata, a pair of juvenile hormone-producing endocrine glands located near the brain in insects; action of the juvenile hormone is interrelated with that of brain hormone and ecdysone; a high concentration of the hormone at the time of molting will cause production of an additional larval instar; removal at an early larval stage causes precocious pupation, resulting in the formation of a midget adult; implantation at late larval stages can cause development of an oversized adult. (05 Mar 2000) |
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| corpus luteum | <gynaecology> A yellow glandular mass in the ovary formed by an ovarian follicle that has matured and discharged its ovum. The corpus luteum secretes progesterone. If the ovum has been impregnated, the corpus luteum increases in size and persists for several months (corpus luteum graviditatis). If impregnation has not taken place, the corpus luteum degenerates and shrinks (corpus luteum menstruationis). Synonym: yellow body of ovary. (13 Nov 1997) |
| corpus luteum deficiency syndrome | <syndrome> Functional disturbances caused by insufficient ovarian luteinization; reflected by inadequate luteal phase endometrial response. (05 Mar 2000) |
| corpus luteum haematoma | A haematoma with a lining formed by the thinned-out bright yellow lutein zone; gradual resorption of the blood elements leaves a cavity filled with a clear fluid, i.e., a corpus luteum cyst. Synonym: corpus luteum haematoma. (05 Mar 2000) |
| corpus luteum hormone | <biochemistry, gynaecology> Produced in the corpus luteum, as an antagonist of oestrogens. Promotes proliferation of uterine mucosa and the implantation of the blastocyst, prevents further follicular development. (18 Nov 1997) |
| corpus luteum hormone unit | The progestational activity of 1 mg of unit of progestational activity; standard preparation of pure progesterone. See: Clauberg test, Corner-Allen unit. Synonym: corpus luteum hormone unit, unit of luteinizing activity. (05 Mar 2000) |
| corpus luteum maintenance | Physiologic and biochemical factors that maintain an actively functioning corpus luteum. (12 Dec 1998) |
| corpus luteum regression | Involution and cessation of endocrine function of a corpus luteum. (12 Dec 1998) |
| prolapse of the corpus luteum | Ectropion of the corpus luteum, due to eversion of the granulosa membrane through the opening in the ruptured follicle; this occurs normally in certain animals. (05 Mar 2000) |
| punctum | A point. Punctum caecum. [L, blind point. <anatomy> Same as Blind spot, under Blind. Punctum proximum, near point. See Point. Punctum remotum, far point. See Point. <botany> Punctum vegetationis [L, point of vegetation], the terminal cell of a stem, or of a leaf bud, from which new growth originates. Origin: L, a point. Source: Websters Dictionary (01 Mar 1998) |
| punctum caecum | The blind spot in the visual field corresponding to the location of the optic disk. (05 Mar 2000) |
| punctum coxale | The highest point of the crest of the ilium. (05 Mar 2000) |
| punctum dolorosum | See: Valleix's points. (05 Mar 2000) |
| punctum lacrimale | The minute circular opening of the lacrimal canaliculus, on the margin of each eyelid near the medial commissure. Synonym: punctum lacrimale, lacrimal opening. (05 Mar 2000) |
| punctum ossificationis | The site of earliest bone formation via accumulation of osteoblasts within connective tissue (membranous ossification) or of earliest destruction of cartilage prior to onset of ossification (endochondral ossification). Synonym: punctum ossificationis, ossific centre, point of ossification. (05 Mar 2000) |