Musculus pyramidalis

The video tutorial explains the anatomy and function of the pyramidalis muscle, a small triangular muscle in the anterior abdominal wall. It is part of the abdominal muscles group, alongside the rectus abdominis. The pyramidalis muscle is considered rudimentary in humans, with its primary function being to tense the rectus sheath. It is more developed in certain animals like koalas and kangaroos. The tutorial also covers the muscle's anatomical position, its relation to the rectus sheath, and its evolutionary significance.

Which muscles are part of the anterior abdominal wall?

• Obliques and transversus abdominis

• Pectoralis major and minor

• Latissimus dorsi and trapezius

• Pyramidalis and rectus abdominis

Where does the pyramidalis muscle run from and to?

• From the superior ramus of the OS pubis to the base of the rectus abdominis

• From the scapula to the humerus

• From the sternum to the clavicle

• From the iliac crest to the lower ribs

What forms the rectus sheath?

• Tendons of various abdominal muscles

• Cartilage of the rib cage

• Muscles of the back

• Ligaments of the spine

Which animals are associated with the pyramidalis muscle?

• Hedgehogs and koalas

• Dolphins and whales

• Lions and tigers

• Elephants and giraffes

Why is the pyramidalis muscle underdeveloped in many humans?

• It no longer plays a significant role in highly developed mammals

• It is primarily used for climbing

• It is only needed for swimming

• It is essential for flying