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 unique about the origin of the lumbrical muscles?

• They originate from tendons.

• They originate from skin.

• They originate from bones.

• They originate from ligaments.

Which nerve innervates the first and second lumbrical muscles?

• Musculocutaneous nerve

• Radial nerve

• Ulnar nerve

• Median nerve

Where do the lumbrical muscles attach?

• To the dorsal aponeurosis

• To the phalanges

• To the metacarpal bones

• To the palmar aponeurosis

What movement do the lumbrical muscles facilitate in the fingers?

• Flexion in the wrist

• Extension in the elbow

• Rotation in the shoulder

• Flexion and extension in the fingers

How do the lumbrical muscles achieve opposing movements in the fingers?

• By attaching to the wrist

• By originating from the phalanges

• By crossing joints on the palmar side and inserting on the dorsal side

• By being innervated by the radial nerve