HD FS 276 Lecture Notes - Lecture 13: Corpus Spongiosum Penis, Seminiferous Tubule, Bulbospongiosus Muscle
4 Apr 2017
School
Department
Course
Professor
Document Summary
Shaft has 3 parallel cylinders of spongy tissue: corpora cavernosa (2, corpus spongiosum. Spongiosum expands in from to form the smooth round tip (glans: urethra runs through spongiosum, serves as passageway for urine and semen. Root: expanded ends of cavernous bodies, surrounded by bulbocavernosus and ischiocavernosus muscles. Rare conditions of penis: micropenis; less than 1 , hypospadias. Opening of the urethra being at a different point than tip of the glans: peyronie"s disease. Scrotum: sac located beneath penis, contains testicles, contains small muscle fibers, sweat glands aid in temperature regulation, sparsely covered with hair. Evolutionary psychology: size of the testes (across species) = more polygamous, complexity of the penis (across species) = more polygamous. Two functions produce sperm & hormones: in abdominal cavity during fetal development, descent to scrotum 2 months before birth, fail to descend in 2-5% of males. Usually corrects itself: right-handed men, left testicle hangs lower, seminiferous tubules. Produce inhibin: interstitial cells of leydig.
