Answers to Last Week's Questions

The primary motor cortex is located in the frontal lobe. True

Clinical Relevance: On the lateral aspect of the cortex is the poorly named "central sulcus". The cortex anterior to the central sulcus is the logically named "pre-central gyrus", the main motor area concerned with the initiation of voluntary movement. Look up the blood supply of this area.

The pelvic floor is under involuntary control. False

Clinical Relevance: The pelvic floor or diaphragm (levator ani) is a sheet of voluntary muscle. Apart from functioning as part of the anal and urinary sphincters, it supports the uterus and bladder. If damaged (e.g., childbirth), there may be problems with incontinence and prolapse of the uterus, rectum and bladder. Look up Keegel exercises.