The scrotum is a pouch of skin lying below the pubic symphysis and just in front of the upper parts of the thighs. The labia form as a default in the absence of testosterone during embryological development. Start studying Biology unit 7 practice test. This, along with the loss of subcutaneous fat, results in wrinkles. The fat stored in this layer represents an energy source for the body and helps to insulate the body against changes in the outside temperature. Specialized skin cells and structures are formed from 3-6 months of gestation. Each vas deferens joins with a duct from the seminal vesicle to form an ejaculatory duct. The thickest skin is on the soles of the feet and the palms of the hands. The skin varies in thickness and the number of hair follicles, sebaceous glands and sweat glands in different areas of the body. Inside the pouch, … This is balanced by the dividing cells in the basal cell layer to produce a state of constant renewal. The skin is composed of two major layers: a superficial epidermis and a deeper dermis. Skin Definition. CallUrl('www>course-notes>org