BackIn 1962 a boy playing in a train yard fell under a train. The train wheel cleanly cut off his right arm. Surgeons reattached the arm, sewing nerves and vessels back together. The boy was told he should eventually regain the use of his arm but that it would never be strong enough to pitch a baseball. Explain why full recovery of strength was unlikely.
The lower motor neurons that innervate contractile skeletal muscle fibers are called:
a. α-motor neurons
b. β-motor neurons
c. upper motor neurons
d. γ-motor neurons
One of a group of rabbit hunters was accidentally sprayed with buckshot in both of his gluteal prominences. When his companions saw that he would survive, they laughed and joked about where he had been shot. They were horrified and ashamed a week later when they learned their friend would be permanently paralyzed and without sensation in both legs from the knee down, as well as on the back of his thighs. What had happened?
Ramin presents for evaluation after a severe shoulder injury during which his entire brachial plexus suffered damage. What effects would you expect Ramin to have from this injury?
Why is visceral pain often perceived as cutaneous pain?
Mark the following statements about the spinal cord as true or false. If a statement is false, correct it to make a true statement.
The corticospinal tracts are the main sensory tracts in the spinal cord.
Which of the following somatic sensations is not carried by the posterior columns?
a. Tactile senses
b. Temperature
c. Proprioception
d. Stretch
Marcus, a football quarterback, suffered torn menisci in his right knee joint when tackled from the side. The same injury crushed his common fibular nerve against the head of the fibula. What locomotor problems did Marcus have after this?