Ch5-8ClassNotes

Ch5-8ClassNotes - Human Sexuality Class Notes 29/09/2010...

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Unformatted text preview: Human Sexuality Class Notes 29/09/2010 11:37:00 Chapter 4 Continued ~Sexual Functions of the Penis~ Automatic, unlearned responses Stimulation triggers response Spinal cord controls reflexes 2 erection centers: o sacrum thick, triangular bone located near bottom of spinal column o lumbar region Lumbar Region Where brain stimulation & responses are routed through during arousal Brain fantasies, sights, memories Where perceptions, thoughts, emotions contribute or inhibit Autonomic Nervous System Regulates autonomic body processes Sympathetic o Most active during emotional responses that send energy Parasympathetic o Most active during processes that restore energy o Erection Abnormalities Peyronies Disease o Excessive curvature of penis o Can make erections painful o Build up of tissues Priapism o Erection lasting hours/days o Starves penis of oxygen Genital Retraction Syndrome o Shrinking of penis o Penis thievery ~Sexual Functions~ Ejaculation o Process by which semen is expelled outside the body through the urethra o Spinal reflex o 2 stages Emission Stage (triggered by lumbar) Seminal fluid gathers in urethral bulb Contractions of seminal vesicles, prostate, ampulla (vas deferens), propel seminal fluid Retrograde Ejaculation o Semen is expelled into bladder o 2 sphincters internal external o occurs when external is closed and internal remains open ~Penile Augmentation~ Phalloplasty o Penis reconstruction o Procedure to lengthen and add growth o Snip ligaments (add length) o Fat injections o Skin grafts (add girth/width) o Little data to support o Decreases sensation Chapter 5 ~Sexual Arousal & Response~ Influences of Arousal Senses Hormones Brain Pheromones Chemicals Role of Brain Cerebral cortex o Outer layer of cerebrum that controls higher mental processes Reasoning, logic, imagination, fantasies Limbic system o Determines sexual behavior o Where thoughts, emotions, memories & fantasies lie o Stimulates arousal without direct genital stimulation o Can inhibit arousal o Sexual thoughts occur in cortex Messages sent through spinal cord to erection centers Pleasure Centers o Found through rat research o Damage results in changes in behavior (more sexual behavior) Role of Hormones Influence sexuality and attraction Sex hormones produced in gonads Both sexes produce estrogens and androgens o Different sensitivity o Men produce 20-40x more testosterone Sex Hormones in Men Testosterone influences desire, sensitivity, and motivation of genitals & sex o Low levels influence desire and drive Castration (balls)...
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Ch5-8ClassNotes - Human Sexuality Class Notes 29/09/2010...

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