| Name: | photoreceptor outer segment layer |
|---|---|
| Synonyms: | photoreceptor outer segment layers |
| Definition: | Layer of the retina composed of the outer segments of the photoreceptor cells. The photoreceptor outer segment is a specialized primary cilium consisting of a microtubule-based axoneme and regular stacks of membrane folds or disks containing the photopigments (opsins) required for the phototransduction cascade. |
| Ontology: | Anatomy Ontology [ZFA:0001466] |
| Name: | pigment granule |
|---|---|
| Synonyms: | |
| Definition: | A small, subcellular membrane-bounded vesicle containing pigment and/or pigment precursor molecules. Pigment granule biogenesis is poorly understood, as pigment granules are derived from multiple sources including the endoplasmic reticulum, coated vesicles, lysosomes, and endosomes. |
| Ontology: | GO: Cellular Component [GO:0048770] QuickGO AmiGO |