This transcript provides a histological description and comparative analysis of the secretory (post-ovulatory or luteal phase) endometrium. The key distinctions from the proliferative phase are highlighted, noting that the secretory endometrium is typically twice as thick (2-4 mm) and is characterized by a shift from growth to secretion. Histologically, this phase exhibits a pronounced lack of mitotic figures in the glands and stroma, along with the presence of abundant secretory material released into the glandular lumen. The tissue's appearance reflects its primary influence by the luteal phase hormones.
Histology of the Secretory Endometrium
0:00:07 Comparison Focus: The discussion centers on the differences between the secretory (post-ovulatory/luteal phase) endometrium and the proliferative (pre-ovulatory) endometrium.
0:00:21 Thickness: Secretory endometrium is approximately twice as thick as proliferative endometrium, generally measuring 2-4 mm compared to about 1 mm.
0:00:31 Shift from Growth to Secretion: Unlike the proliferative phase, secretory endometrium is characterized by a severe lack of mitotic figures in the glands and stroma (0:00:52), indicating that the tissue is no longer growing but actively secreting.
0:01:43 Abundant Secretion: A key feature of the secretory phase is the abundance of released secretion material within the glandular lumens. Proliferative glands lack these secretions.
0:01:46 Early vs. Late Phase Differentiation: In the early secretory phase, cells contain vacuoles; however, in the later phase (represented by the sample), these vacuoles are gone because the secretions have been fully released.
0:01:08 Structural Characteristics: The secretory tissue is generally thicker, and the glands and blood vessels appear more coiled.
0:02:05 Terminology: The secretory endometrium is also known as the post-ovulatory endometrium or the luteal phase, which is primarily under hormonal influence (implying progesterone).