Attention deficit hyperactivity disorder (ADHD) should be diagnosed and treated in children as young as age 4, according to new guidelines from the American Academy of Pediatrics. Skip to main content
ephemeris. 1  a table showing the positions of a heavenly body on a number of dates in a regular sequence. 2  an astronomical almanac containing such tables. 3  Archaic. an almanac or calendar.
The epididymis (/ÉpÉ¨ËdÉªdÉ¨mÉªs/ ; plural: epididymides /ÉpÉ¨dÉ¨ËdÉªmÉdiËz/ or /ÉpÉ¨ËdÉªdÉmÉªdiËz/) is a tube that connects a testicle to a vas deferens in the male reproductive system.It is present in all male reptiles, birds, and mammals. The head (Latin: Caput). 2  The head of the epididymis receives spermatozoa via the efferent ducts of the mediastinium of the testis. 3  It is characterized histologically by a thin myoepithelium. 4  The concentration of the sperm here is dilute.