Zoology 330- Embryology Definitions

An atretic follicle is not a healthy follicle but rather a degenerating one. It does not refer to a benign growth or a type of flower, but specifically to a deteriorating ovarian follicle in mammals.

Atresia refers to the abnormal closure or absence of a body orifice, not an excessive opening, enlargement, or symmetry of the orifice.

Follicular atresia specifically refers to the breakdown of ovarian follicles, not their formation, release of mature oocytes, or the process of fertilization in the fallopian tube.

The corpus luteum is specifically related to the female reproductive system and plays a crucial role in the process of maintaining pregnancy.

The cortex refers to the outer zone of an organ or egg, specifically containing the follicles and corpora lutea of the ovary. It is not related to fruits, computer processors, or mathematical terms in this context.

The cumulus oophorus is a cluster of cells in the stratum granulosa of a mature follicle, not related to the epididymis, white blood cells, or plant cells.

Diakinesis is the meiotic stage where chromosomes separate further moving the chiasmata to the ends of chromosomes. This stage is crucial for the proper alignment and separation of chromosomes during meiosis.

A pronucleus is the nucleus of a sperm or an egg cell during the process of fertilization, after the sperm enters the ovum, but before they fuse. Sperm and egg cells are haploid, meaning they carry half the number of chromosomes. When the pronucleus of a sperm fuses with the pronucleus of an egg, their chromosomes combine and become part of a single diploid nucleus in the resulting embryo, containing a full set of chromosomes.

Follicle cells are specifically related to the reproductive system and play a role in the development of oocytes in organisms like birds and mammals.

The Follicular Cavity specifically refers to the space within the Graafian follicle in the female reproductive system.

The germinal epithelium refers to the epithelial covering of the adult ovary and the embryonic gonad, derived from splanchnic mesoderm and primordial germ cells. It is not a layer of squamous cells, the innermost layer of the skin, or responsible for producing bile in the liver.

The germinal vesicle is a specific structure within a cell related to reproduction and not associated with viruses, plant organelles, or bacterial cell components.

A graafian follicle specifically refers to a structure in the ovaries of mammals and is related to reproductive processes, not to skin disorders, fruits, or geological formations.

The Leptotene stage is specifically related to the first meiotic division in spermatogenesis and oogenesis where chromosomes take on a distinct form.

The Zygotene stage is characterized by the synapsis or pairing of homologous chromosomes, not the breakdown of the nuclear envelope, chromosome condensation, or cytokinesis.

The medulla refers to the inner or deep region of an organ, such as the ovary, where it is defined as a region of connective tissues and blood vessels lacking follicles.

The mesorchium refers to the peritoneal fold that attaches the testis to the mesonephros, not to the skin, bone, or blood vessels.

The mesovarium is part of the broad ligament of the uterus that covers and provides support for the ovaries.

The mesentery is a double layer of peritoneum in the abdomen, not related to bones, muscles, or the heart.

An oocyte is specifically defined as the immature egg in the context of ovarian cells, and it undergoes specific processes to become a mature egg. The incorrect answers provided do not align with this definition.

Prophase I of the first meiotic division consists of five stages: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis. Each stage represents specific events and processes that occur as the chromosomes condense and pair up for genetic recombination.

The Pachytene Stage is specifically a stage in the first meiotic division in spermatogenesis and oogenesis, involving the synapsis of homologous chromosomes and the formation of bivalents. It is distinct from the other stages mentioned in the incorrect answers.

A primary follicle in the context of mammalian ovaries refers to a specific developmental stage of ovarian follicles containing the oocyte surrounded by follicle cells, not to be confused with other types of follicles, plant structures, or skin conditions.

A primary oocyte is an immature egg that has not completed its first meiotic division yet, distinguishing it from other stages of egg development and fertilization.

Primary spermatocytes are specific to the male reproductive system and are involved in the process of sperm production through meiosis.

Residual bodies refer to granules of degenerating cytoplasm sloughed off by differentiating spermatids and phagocytized by the Sertoli cells during spermatogenesis.

Secondary spermatocytes are male germ cells that are formed after the first meiotic division of primary spermatocytes and undergo a second meiotic division to form spermatids. They are distinguished by their intermediate size and play a crucial role in sperm production.