BIOM2020 Study Guide - Final Guide: Prolactin, Bartholin'S Gland, Suspensory Ligament
Document Summary
Scrotal skin: the supporting structure for the testes, consists of loose skin and an underlying subcutaneous layer that hangs from the root (attached portion) of the penis; divided by scrotal septum centrally between the two testis. Tonic contraction of dartos muscle causes wrinkles on the scrotal surface ~ elevation of the testes. Wall of scrotum: external (skin), superficial fascia, smooth muscle (dartos) Dartos muscle: composed of bundles of smooth muscle fibres; makes up scrotal septum and subcutaneous layer of scrotum. Cremaster muscle: consists of a series of small bands of skeletal muscle that descend as an extension of the internal oblique muscle, through the spermatic cord to surround the testis. In cold temperatures, contraction of the cremaster muscle moves the testes closer to the body, allowing them to absorb body heat. Contraction of the dartos muscles causes the scrotum to become tight (wrinkled in appearance), which reduces heat loss.
