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CHA Laboratory Problems Each computer station has a copy of the VH Dissector, and appropriate digital images (MRI, CT, Ultrasound, x-ray). • • • • • • Answer the question Go to the VH-Dissector: Clear the dissection area Add the skeleton Build the involved structure(s) Identify the structure(s) in the transverse, sagittal and coronal plane windows • Save your work under Favorites. • A preferred correct answer is provided after completion of the exercise Examples 1. A patient sustains a transection of the posterior cord of the brachial plexus from a knife injury. This injury would affect all of the following muscles EXCEPT? a) b) c) d) e) Latissimus dorsi Supraspinatus Teres minor Subscapularis Brachioradialis • • • • Answer the question Build the brachial plexus with the VH-D Highlight the posterior cord and the correct muscle Save your work under the Favorites tab Correct answer Suprspinatus The posterior cord of the brachial plexus gives rise to the 1) upper subscapular nerve 2) lower subscapular nerve3) thoracodorsal nerve 4) axillary nerve 5) radial nerve. The upper subscapular nerve innervates the subscapularis. the lower subscapular nerve innervates teres major and also subscapularis. The thoracodorsal nerve innervates latisimus dorsi. The axillary nerve innervates deltoid and teres minor. The radial nerve innervates the triceps, brachioradialis, wrist extensors, and finger extensors. The supraspinatus is innervated by the suprascapular nerve off the upper trunk and therefore would not be affected by an injury to the posterior cord. See Brachial Plexus Diagrams on CHA web site. http://www.computerhumananatomy.com/id9.html Password CHA123 Example 2 A 46 year old woman presents with 3 months of aching pain in the medial mid thigh. One the past month she has noticed a lump in the area of pain. An MRI is provided. It shows a tumor in one of the thigh muscles. Which muscle is it? Which nerve innervates this muscle? Answer the questions • • • • • • Go to VH-Dissector Clear the dissection Add the skeleton Add the muscle and the nerve which innervates it. Match the transverse section of the T1 MRI to the transverse section of the VH-D. Save your work under the Favorite tab Answer Sartorius The MRI shows a tumor located in the sartorius muscle, which is innervated by the femoral nerve. While the sartorius nerve shares the same name, it does not innervate the sartorius muscle