myoid


Also found in: Dictionary, Thesaurus, Encyclopedia.

myoid

 [mi´oid]
resembling muscle.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

my·oid

(mī'oyd),
1. Resembling muscle.
2. One of the fine, contractile, threadlike protoplasmic elements found in certain epithelial cells in lower animals.
3. A contractile part of retinal cones in certain fish and amphibia. In mammals, the myoid is the inner part of the inner segment of rods and cones; it contains microtubules, the Golgi apparatus, endoplasmic reticulum, and ribosomes, but no myofibrils.
[myo- + G. eidos, appearance]
Farlex Partner Medical Dictionary © Farlex 2012

my·oid

(mī'oyd)
1. Resembling muscle.
2. One of the fine, contractile, threadlike protoplasmic elements found in certain epithelial cells in lower animals.
[myo- + G. eidos, appearance]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ellipsoid

1. The refractile outer portion of the inner member of a rod or cone cell. It is located between the myoid and the outer member of the cell, and contains mitochondria. The myoid is in contact with the external limiting membrane of the retina while the outer member is next to the pigment epithelium. 2. Surface of revolution generated by rotating an ellipse about a major or minor axis.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Keywords * Spleen * Malignancy * Myoid angioendothelioma
* Lesions in the second category show clear evidence of myoid or pericytic differentiation, they histologically correspond to true HPCs, and they generally show a benign clinical course.
19 cases of discrepancy involved leiomyosarcomas, with 5 benign-malignant discordances (3 cases of diagnosis changed from benign entities to leiomyosarcoma, and 2 of leiomyosarcomas changed to benign tumours), 4 major classification discrepancies (involving leiomyosarcomas and other spindle cell tumours), 3 major discrepancies involving grade, and 7 minor classification discrepancies (leiomyosarcomas versus pleomorphic sarcomas with myoid differentiation).
Myofibroma is a rare benign soft tissue neoplasm of contractile myoid cells with predilection for the head and neck.
Each testicle is surrounded by a layer of flattened cells, the myoid cells (Figure 2b).
Histologic variants described are sclerotic fibroma, pleomorphic fibroma and myoid fibroma.
Metaplastic carcinomas represent a morphologically heterogeneous group of invasive breast cancers in which a portion of the glandular epithelial cells comprising the tumor have undergone transformation into an alternate cell type, either a non-glandular epithelial cell type (e.g., squamous cell) or a mesenchymal cell type (e.g., spindle cell, chondroid, osseous, myoid).
The first group of mice was normal, but the second group of mice was missing a gene from the peritubular myoid cells in the testis.
Other contemporary KS variants include glomeruloid KS, pigmented KS, and KS with myoid nodules [57].
Another domain, the myoid, lies between the OS and cell body and it is in this domain that PRC elongation/contraction occur in response to changes in light conditions (Rey and Burnside, 1999).
This layer of connective tissue encompasses peritubular myoid cells, which are joined by punctate junctions to form a continuous sheet of cells.