Very high power TEM of an early stage 2 embryo in vivo, (original magnification x40,000). Mitochondria (M) are rounded with peripherally located cristae. Small vesicles of the smooth endoplasmic reticulum are in close association with the mitochondria. Larger free vesicles (V) of the endoplasmic reticulum are also present.
From: Pereda and Croxatto, 1992. Reproduced with permission of the Annals, Academy of Medicine, Singapore.
Keywords: cristae, endoplasmic reticulum, mitochondria, smooth endoplasmic reticulum, stage 2 embryo, vesicles
Source: The Virtual Human Embryo.