Rat Arm Muscles and Functions

The video tutorial covers the dissection of arm and chest muscles in a rat, focusing on the biceps brachii, triceps brachii, forearm muscles, and pectoralis major and minor. It explains the anatomy and function of these muscles, highlighting the differences between rats and humans. The tutorial provides detailed instructions on how to carefully dissect and identify each muscle group, emphasizing the importance of handling connective tissue to avoid damaging muscle fibers.

What is the main challenge when dissecting the arm muscles of a rat?

• The skin is too thick.

• The bones are fragile.

• The fascia is tightly attached to the muscles.

• The muscles are too large.

Why is the biceps brachii in rats smaller compared to humans?

• Rats have a different bone structure.

• Rats have larger triceps instead.

• Rats do not use their arms for lifting.

• Rats do not flex their elbows often.

What is the primary function of the wrist flexors in the forearm?

• To stabilize the elbow.

• To rotate the forearm.

• To extend the wrist.

• To flex the wrist.

Where do the wrist flexors originate in the rat's forearm?

• On the ulna.

• On the scapula.

• On the radius.

• On the humerus.

What is the role of the triceps brachii in the rat's arm?

• To rotate the shoulder.

• To flex the forearm.

• To extend the forearm.

• To stabilize the wrist.

Where does the triceps brachii insert in the rat's arm?

• On the radius.

• On the ulna.

• On the scapula.

• On the olecranon.

What is the function of the wrist extensors in the rat's forearm?

• To rotate the forearm.

• To extend the wrist.

• To flex the wrist.

• To stabilize the elbow.

How can you distinguish between the pectoralis major and minor during dissection?

• By their size.

• By their texture.

• By their location.

• By their color change.

What is the primary function of the pectoral muscles in rats?

• To move the chest.

• To move the arm.

• To stabilize the shoulder.

• To protect the ribs.

What tool is recommended for separating the pectoral muscles during dissection?

• Scissors

• Tweezers

• Probe or forceps

• Scalpel