Copy of `Dorland's Medical Dictionary`

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Dorland's Medical Dictionary Category: Health and Medicine > Medical Dictionary Date & country: 31/12/2010, USA Words: 39128

zygal fissure
any of the fissures on the cerebral cortex that consist of two branches connected by a stem.

zygapophysis
(zi″gә-pof´ĭ-sis) the joint between two adjacent vertebrae; called also facet joint.

zygion
(zij´e-on) the most lateral point on the zygomatic arch.

zygoma
(zi-go´mә) zygomatic process. zygomatic arch. a term sometimes applied to the zygomatic bone.

zygomatic
(zi″go-mat´ik) pertaining to the zygomatic bone.

zygomatic arch
the arch formed by the temporal process of the zygomatic bone and the zygomatic process of the temporal bone.

zygomatic bone
the four-sided bone of the cheek. It joins with the frontal bone, maxilla, temporal bone, and greater wing of sphenoid bone.

zygomatic nerve
origin, maxillary nerve, entering the orbit through the inferior orbital fissure; branches, zygomaticofacial and zygomaticotemporal branches; distribution, communicates with the lacrimal nerve and supplies the skin of the temple and adjacent part of the face; modality, general sensory.

zygomatic process
a projection in three parts, from the frontal bone, temporal bone, and maxilla, by which they articulate with the zygomatic bone.

zygomatic reflex
lateral motion of the lower jaw to the percussed side on percussion over the zygoma.

zygomatico-orbital artery
origin, superficial temporal artery; branches, none; distribution, lateral side of orbit.

zygomaticofacial
(zi″go-mat″ĭ-ko-fa´shәl) pertaining to the zygomatic process or bone and the face.

zygomaticofacial foramen
the opening on the anterior surface of the zygomatic bone for the zygomaticofacial nerves and vessels.

zygomaticotemporal
(zi″go-mat″ĭ-ko-tem´pәr-әl) pertaining to the zygomatic process or bone and the temporal bone.

zygomaticotemporal canal
zygomaticotemporal foramen.

zygomaticotemporal foramen
an opening on the temporal surface of the zygomatic bone.

zygomaticus major muscle
greater zygomatic muscle: origin, zygomatic bone in front of temporal process; insertion, corner of mouth; innervation, facia nervel; action, draws corner of mouth backward and upward.

zygomaticus minor muscle
lesser zygomatic muscle: origin, zygomatic bone near maxillary suture; insertion, orbicularis oris and levator labii superioris muscles; innervation, facial nerve; action, draws upper lip upward and laterally.

Zygomycetes
(zi″go-mi-se´tēz) a class of saprobic and parasitic fungi of the phylum Zygomycota; important pathogenic organisms are in the orders Entomophthorales and Mucorales.

zygomycosis
(zi″go-mi-ko´sis) any fungal infection with members of the class Zygomycetes, including entomophthoromycosis and mucormycosis. mucormycosis. rhinocerebral zygomycosis zygomycosis that has spread from the paranasal sinuses to the brain. rhinofacial zygomy...

zygon
(zi´gon) the stem connecting the two branches of a zygal fissure.

zygosity
(zi-gos´ĭ-te) the genetic condition or characteristics of a zygote.

zygote
(zi´gōt) the cell resulting from union of a male and a female gamete; the fertilized oocyte (see also reproduction). More precisely, the cell after synapsis at the completion of fertilization until first cleavage. adj., zygot´ic., adj.

zygote intrafallopian transfer
(ZIFT) a type of assisted reproductive technology consisting of retrieval of oocytes from the ovary, followed by their fertilization and culture in the laboratory and the placement of the resulting zygotes in the fallopian tubes by laparoscopy 24 hours after the original retrieval.

zygotene
(zi´go-tēn) the second stage of prophase in meiosis I, during which homologous chromosomes begin to pair by the process of synapsis.

Zyloprim
(zi´lo-prim) trademark for a preparation of allopurinol, an inhibitor of uric acid production in the body used to treat hyperuricemia of gout and that secondary to blood dyscrasias or cancer chemotherapy.

zymogen
(zi´mo-jәn) an inactive precursor that is converted into an active enzyme by action of an acid or another enzyme or by other means; a proenzyme. adj., zymogen´ic., adj.

zymogenic cells
ones that contain zymogens and secrete enzymes; see acinar cells and chief cells (def. 1).