Anatomy and supply. The thenar musculature consists of four muscles located on the radial side of the palm. Together they form the 'ball' of the thumb known as the thenar eminence. They originate at different carpal bones and distally attach to the thumb. The thenar muscles are: Abductor pollicis brevis muscle: arises from the tubercles of the scaphoid and trapezium, and from the flexor retinaculum.
Steps. 1  1. Choose the proper time to prune lemon trees. 2  2. Remove all fruit from the tree. 3  3. Prune any branches that are damaged or diseased all the way back to the base.  4. Cut any branches that are smaller than the diameter of a 1  pencil. 5. Prune suckers as they appear at any time.  6. Decide if you want an open, compact, or hedge type tree look.
To maintain healthy trees, fertilize citrus every six weeks when the tree is under seven years old with a good citrus fertilizer, not fertilizer tree spikes. Adult trees should be fertilized often but in small amounts. Fertilize from October through February.hen roots of the tree sit in water, they have a tendency to develop root rot, which in turn results in the lemon tree dropping leaves. Mulch around the root area, minimize irrigation, plant in well draining soil and keep grass away from the base of the tree to avoid root rot and its accompanying problems.