The bi-potential external genitalia are those that exist before the the genitalia differentiate into male or female genitalia under the influence of various hormones. The structures that are eventually derived from the 3 main parts of the undifferentiated external genitalia are as follows for females and males:
Female
Male
The hormone responsible for differentiation of the male reproductive organs during fetal life is dihydrotestosterone (DHT). It is derived from testosterone and plays a key role in the development of male external genitalia.
brain and spinal cord
it means problems which come from outside of something. External means coming or derived from an outside source.
Structures which are derived from the foregut are:stomachlivergall bladderpancreasduodenal cap, descending duodenum (1st and 2nd parts of the duodenum)
Structures derived from the hindgut are:distal third of the transverse colondescending colonsigmoid colonrectumupper portion of the anal canal
Read page 12 of the lab manual... Derived is more resent than conservative, therefore it would have appeared later than conservative.
Chromosomes
Structures which are derived from the midgut are:horizontal and ascending duodenum (3rd and 4th parts)jejunumiliumcecumascending colonfirst two-thirds of the transverse colon
No, melanoma is skin cancer derived from melanocytes. Non-melanoma skin cancer is a malignant growth of the external surface or epithelial layer of the skin.
The notochord is an adult structure that is not derived from the same primary germ layer as the others. While structures like muscles, bones, and connective tissues derive from mesoderm, the notochord originates from the mesoderm but later forms from the embryonic ectoderm.
An empiricist believes that knowledge is derived from sensory experience and observation of the external world. They emphasize the importance of evidence and empirical data to understand the world around us.
Micromeres are derived from early blastomeres during cell division in the embryo. They are the smallest cells produced during cleavage and play a crucial role in the formation of different cell types and structures in the developing organism.