HTHSCI 1H06 Lecture Notes - Lecture 16: Facet Joint, Meninges, Supraspinous Ligament
29 Mar 2018
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Document Summary
The left and right extensors are located at the back of the body wall. The left and right flexors are located at the front of the body wall. There is an expectation to see four muscles innervated around the access of a joint for any part of the body that can circumduct. The flexors, front, of the spine are innervated by the ventral rami of the mixed spinal nerve; causes bending forward. The extensors, back, of the spine are innervated by the dorsal rami of the mixed spinal nerve; causes the body to move back into anatomical position or extend slightly backwards. Flexors and extensors may contract on the same side; causes lateral bending of the spine, side to side. Explain the (4) flexor muscles on the anterior body wall. These muscles, are not only responsible for the spine, can contract to increase intra-abdominal pressure, micturition (urination), parturition (birth), and defecation.
