Musculi lumbricales manus

The video tutorial explains the lumbricoid muscles located in the metacarpal area. These muscles are unique as they originate from tendons rather than bones. The tutorial covers their structure, attachment to the dorsal aponeurosis, and innervation by the median and ulnar nerves. It also details their function in finger movement, causing flexion and extension across various joints.

What is the significance of the radial and ulnar sides in the anatomy of the lumbrical muscles?

How do the tendons of the lumbrical muscles interact with the joints of the fingers?