Category Archives: Anatomy

Autonomic Nervous System Anatomy

Overview The autonomic nervous system (ANS) is a very complex, multifaceted neural network that maintains internal physiologic homeostasis. This network includes cardiovascular, thermoregulatory, gastrointestinal (GI), genitourinary (GU), and ophthalmologic (pupillary) systems (see

Heart Nerve Anatomy

Overview The heart is innervated by parasympathetic and sympathetic fibers. The medulla is the primary site in the brain for regulating sympathetic and parasympathetic outflow to the heart and blood vessels. The

Anal Canal Anatomy

Gross Anatomy The anal canal is the most terminal part of the lower GI tract/large intestine, which lies between the anal verge (anal orifice, anus) in the perineum below and the rectum